Kasus penurunan bangunan dalam dunia konstruksi biasanya diakibatkan oleh beban struktur yang mel... more Kasus penurunan bangunan dalam dunia konstruksi biasanya diakibatkan oleh beban struktur yang melampaui batas izin. Oleh karena itu perlu dilakukan evaluasi untuk memperoleh nilai daya dukung fondasi yang tepat secara efektif. Pada fondasi tiang pancang terdapat beberapa metode yang dapat digunakan dalam menganalisis daya dukung tiang. Studi ini dilakukan dengan tujuan memberikan informasi metode mana yang dapat memaksimalkan kegiatan pemancangan. Faktor utama dalam pemancangan adalah kecocokan hammer yang akan digunakan terhadap daya dukung tiang. Dalam menganalisis daya dukung tiang dapat menggunakan metode statik dengan data hasil uji in-situ, metode dinamik yang berasal dari rekaman pemancangan, dan persamaan gelombang dengan bantuan software GRLWEAP. Analisis daya dukung ultimit dilakukan dengan metode statik memiliki tingkat akurasi mencapai rentang ±10% terhadap uji pembebanan statik. Hasil dari analisis daya dukung ultimit dengan penggunaan software GRLWEAP direkomendasikan ...
Abstract The 2018 MW 7.5 Palu-Donggala, Indonesia earthquake initiated a series of catastrophic f... more Abstract The 2018 MW 7.5 Palu-Donggala, Indonesia earthquake initiated a series of catastrophic flowslides that claimed the lives of several thousand people, making it the deadliest natural disaster of 2018. Three of the most significant flowslides, which occurred in the communities of Petobo, Jono Oge, and Lolu Village, were clustered within alluvial sediments of the Palu River Valley. Post-earthquake field reconnaissance, subsurface investigation, eyewitness interviews, and geomechanical analyses indicate that the failure sequence began when the earthquake ground motion raised pore water pressures in the saturated interbedded alluvial sediments. The flowslides were not coseismic but instead occurred several minutes after earthquake shaking ended. We hypothesize that high excess pore pressures created large hydraulic gradients within the alluvial sediments, which ultimately triggered progressive liquefaction that led to a redistribution of stresses and accumulation of shear strains. The flowslides were then initiated as gravitational driving stresses began to exceed the residual strength of the liquefied soil. Given the interbedded stratigraphy, we speculate that void redistribution and the development of water films possibly contributed to low residual strengths. An adjacent unlined agricultural canal played a critical role in the failure sequence by artificially raising the groundwater level, thereby increasing the susceptibility to liquefaction and attendant strength loss.
ABSTRACTIndonesia is a country located in the most active earthquake paths in the world. This mak... more ABSTRACTIndonesia is a country located in the most active earthquake paths in the world. This makes Indonesia prone to earthquakes and has the potential to experience liquefaction. Liquefaction can cause pile failure, so several things need to be considered in designing piles on potentially liquefied soils. One project in Sulawesi has a profile of uniform grained saturated soil that is susceptible to liquefaction. Two things that need to be considered in the design of piles on potentially liquefied soils is to ignore the capacity of pile friction and calculate the moment due to lateral spreading effects. Calculation of liquefaction potential is done by comparing the ratio of the cyclic stress and the cyclic resistance ratio and is compared by four other methods namely: the Seed et al. (2003), Tsuchida (1970), Seed et al. (2003), and Bray & Sancio (2004). The lateral spreading effect is calculated by referring to the JRA Code where the liquefied soil layer gives pressure to the pile ...
Development in Jakarta took place the most, but the condition of the land in Jakarta ehich was do... more Development in Jakarta took place the most, but the condition of the land in Jakarta ehich was dominated by sof soil was becoming an obstacle. Landfill is one way that can be done to strengthen or improve soft soil. But if this landfill causes a settlement in soil around the pile is bigger than the settlement in the pile, there will be negative skin friction which will cause the pile to be pulled down. This study aims to analyze and compare the magnitude of the influence of negative skin friction caused by the pile by using the undrained parameter, drained parameter, Meyerhof empirical, and Vesic empirical to analyze the carrying capacity of the pile and determine the neutral plane and negative skin friction with the Fellenius method and Prakash & Sharma methods. From the results of the analysis,negative skin friction does not accur in the pile that ends hard soil while it occurs in soil that ends soft soil. The location of neutral plane between the Fellenius method and Prakash & Sh...
As a city develops, less areas will be available for constructions. Out of these available lands,... more As a city develops, less areas will be available for constructions. Out of these available lands, a large quantity of areas has low soil bearing capacity and great amount of settlement. For this type of soil, loading is required in order to stabilize it. This will push out porewater contained inside the soil. However, reaching the expected settlement requires a long time, which can be solved by using prefabricated vertical drain to speed up the process. This is possible because prefabricated vertical drain decreases the travel distance of porewater to half of the vertical drain. Calculations for this thesis are done using one dimensional consolidation method, finite element method, and asaoka method for actual data calculation from the field. Using one dimensional consolidation method, with prefabricated vertical drain distance of 1.2 m in triangular pattern, resulted in settlement level of 2.048 m for 110 days. Using finite element method resulted in settlement level of 2.604 m for...
Basement development in the construction world has become common. The contractor is expected to b... more Basement development in the construction world has become common. The contractor is expected to be able to master the knowledge for the construction of the basement. In practice, it cannot use only one or two methods to be used in each field condition. Many things must be estimated to design a structure, in addition to choosing the shape of the retaining wall used, the selection of support becomes something that must really be considered by looking at field conditions. An example that must be considered in designing a retaining wall itself is the stress of the soil that must be calculated appropriately so as not to damage the retaining wall itself. In addition, the relationship used between projects with deep or shallow excavations. If the retaining wall is lacking or not strong enough to withstand the stresses of the soil, it must be assisted with a support system that will withstand some of the lateral pressure exerted by the soil. In this analysis, the focus of the discussion is ...
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
Deep foundations, especially cast-in-situ piles became popular and key support for most structure... more Deep foundations, especially cast-in-situ piles became popular and key support for most structures in limited land, so as Jakarta. The piles quality became highly dependent on the soil condition and the skill of the contactors. It’s underneath the ground and this makes inspection to its quality became much more difficult. There is many methods for inspection, either by destructive method, i.e. coring, to non-destructive method like low strain integrity test (PIT), cross-hole sonic logging (CSL) and latest is thermal integrity profiler (TIP). Some advances in applicating and evaluating the pile integrity discussed here as well as its advantages and limitations.
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
The foundation of the raft post is the bottom structure of a building that channeled the load fro... more The foundation of the raft post is the bottom structure of a building that channeled the load from the structure over the soil under it. Carrying capacity of drill pile foundation is influenced by the capacity of the pole tipand bearing capacity of the pole blanket. The decline in this area can be an immediate decline and a decrease in consolidation. This study aims to analyze the decrease of raft poles and the proportion of load bearing in the bogie area of the Kelapa Gading LRT warehouse depot - Jakarta. From the analysis of theNSPT test results in the field, the ultimate carrying capacity and the decrease that occurred on the raft poles were obtained. Based on the results of calculation of the ultimate carrying capacity of a single drill pole of 1.1 x 104 kN and the carrying capacity of the group is 1.1 x 108 kN. Calculation of group efficiency with the Feld method is obtained at a value of 0.588. In the calculation of the immediate decline of the pole, a value of 5 cm is obtaine...
The 28 September 2018 MW 7.5 Palu-Donggala earthquake caused massive flowslides within and nearby... more The 28 September 2018 MW 7.5 Palu-Donggala earthquake caused massive flowslides within and nearby the city of Palu. We performed post-earthquake reconnaissance at the flowslide sites and examine a large flowslide that occurred approximately 30 km south of Palu in Sibalaya. We performed field mapping, unmanned aerial vehicle flights, and eyewitness interviews. After the post-earthquake reconnaissance, we performed cone penetration tests. We developed hypothesized flowslide initiation and progression mechanisms from our collective reconnaissance efforts. Based on observed morphological features and eyewitness accounts, the flowslide initiated near a change from steep to shallow terrain. Significant liquefaction of the underlying soils initiated the flowslide after strong ground motions ceased. We speculate progressive liquefaction and/or void redistribution contributed to the timing and delay of initiation.
Tanah adalah salah satu bagian yang memegang peran penting dalam perencanaan konstruksi. Selain b... more Tanah adalah salah satu bagian yang memegang peran penting dalam perencanaan konstruksi. Selain bahan konstruksi tanah juga berguna sebagai pendukung yang menahan seluruh beban aksial dari suatu konstruksi. Dengan mengetahui jenis tanah dan parameter-parameter tanah kita dapat merencanakan suatu pondasi bangunan yang aman dan ekonomis. Parameter-parameter tanah dapat diperoleh dari hasil penyelidikan tanah. Salah satu cara penyelidikan tanah dilapangan yaitu dengan uji sondir (CPT) yang menghasilkan parameter-parameter tanah berupa qc, fs, dan FR. Parameter-parameter Nspt, c, f, gwet, gdry, dan gsat adalah parameter yang berguna dalam perencanaan konstruksi. Parameter-parameter Nspt, c, f, gwet, gdry, dan gsat dapat dihitung menggunakan korelasi yang didapat dengan melakukan regresi pada grafik hubungan qc terhadap Nspt sehingga menghasilkan korelasi untuk qc bernilai antara 0 sampai 20 kg/cm2 adalah Nspt = 0.25 qc, antara 20 sampai 90 kg/cm2 adalah Nspt = 0.2148 qc + 0.7143, dan ...
Pondasi tiang telah menjadi salah satu pilihan dalam suatu proyek infrastruktur dikarenakan fonda... more Pondasi tiang telah menjadi salah satu pilihan dalam suatu proyek infrastruktur dikarenakan fondasi tiang berfungsi meneruskan beban dari struktur diatasnya menuju lapisan tanah. Salah satu pilihan pondasi tiang adalah pondasi tiang pancang. Dalam proses desain untuk mencari daya dukung pondasi tiang terdapat beberapa kombinasi rumus baik di tanah pasir ataupun lempung, diantaranya adalah Meyerhof 1976, Lambda, Alpha, Beta, Tomlinson, Coyle Castello, Meyerhof 1956 dan deRuiter&Beringen. Hasil daya dukung dari rumus tersebut perlu diuji dilapangan dengan pembebanan statik dan dinamik. Kemudian untuk tiang pancang terdapat faktor yang mempengaruhi daya dukung salah satunya faktor soil setup. Hasil Analisis menunjukan tiang pancang yang terpasang pada tanah di daerah Cirebon dengan ukuran 400mm, 600mm dan 762mm dengan jenis spun pile dan steel pipe pile memiliki kecenderungan peningkatan daya dukung dengan kisaran 18-33% berdasarkan uji pembebanan statik dan dinamik selama 7 hari, dan ...
Dalam proyek teknik sipil, terutama proyek jalan raya, banyak masalah yang ditimbulkan oleh beban... more Dalam proyek teknik sipil, terutama proyek jalan raya, banyak masalah yang ditimbulkan oleh beban. Beban yang bekerja pada perkerasan jalan, seperti berat sendiri, beban lalu lintas, dan timbunan, dapat menimbulkan penurunan yang besar pada tanah. Salah satu usaha perkuatan yang sering digunakan adalah memasang geotekstil. Dalam studi ini akan dibandingkan besarnya penurunan dengan atau tidak menggunakan geotekstil dengan memperhatikan faktor keamanan terhadap berbagai kedalaman muka air tanah. Hasil studi menunjukkan bahwa penggunaan geotekstil dapat mengurangi penurunan pada tanah dasar bila dibandingkan dengan tidak menggunakan geotekstil dengan rata-rata 7,633% pada kondisi short term dan 4,113% pada kondisi long term selain itu terdapat peningkatan faktor keamanan rata-rata sebesar 2,064% pada kondisi short term dan 19,58% pada kondisi long term.
Dewasa ini tingkat pembangunan semakin meningkat mengikuti bertambahnya populasi penduduk. Pada u... more Dewasa ini tingkat pembangunan semakin meningkat mengikuti bertambahnya populasi penduduk. Pada umumnya lahan yang tersedia untuk pembangunan di kota-kota besar relatif kecil serta berhimpitan dengan bangunan-bangunan di sekitarnya sehingga di perlukannya alternatif teknik instalasi fondasi yang minim getaran. Inner boring merupakan sebuah teknologi pemasangan tiang fondasi pracetak (spun pile) yang mengkombinasikan metode drilling dan jacking dengan cara melubangi tanah dengan bor sambil memasukan tiang fondasi dengan cara di tekan. Tugas akhir ini membahas analisa perbandingan daya dukung fondasi dalam dengan metode instalasi Inner boring ,Pancang, dan Bored pile serta membandingkan dengan data uji beban-VWSG. Perhitungan daya dukung fondasi Inner boring menggunakan metode Nakabori Kakutei System (NAKS). Perhitungan daya dukung Pancang dihitung dengan membandingkan metode Meyerhof, Brown, dan Briaud .et.al. Sedangkan fondasi Bored pile dihitung dengan membandingkan metode Meyerhof...
The classification of radar targets is one of the most important study topics, especially in the ... more The classification of radar targets is one of the most important study topics, especially in the defense and automotive industries. However, in most of the studies in the literature, raw radar signals are used. Raw radar signals may be subject to ambient noise and signal modulation effects. This may make it difficult to classify radar targets. In this study, instead of using raw data, Fourier-based features extracted from Radar Cross-sectional Area have been used. These extracted features are then input to two types of classifiers, ie, Naive Bayes (NB) and Artificial Neural Networks (ANN) for the classification of radar targets. In addition, both classifiers were trained with different algorithms and their performances were compared. In the ANN-based classifiers, the best accuracy was found that 96.69% with using Bayesian regularization and back propagation training function. On the other hand, the best accuracy with the NB classifier was achieved at 93.95% using Epanechnikov Kernel Distribution. The result presented here demonstrates that Fourier transform based feature extraction can be used effectively in radar target classification applications.
Kasus penurunan bangunan dalam dunia konstruksi biasanya diakibatkan oleh beban struktur yang mel... more Kasus penurunan bangunan dalam dunia konstruksi biasanya diakibatkan oleh beban struktur yang melampaui batas izin. Oleh karena itu perlu dilakukan evaluasi untuk memperoleh nilai daya dukung fondasi yang tepat secara efektif. Pada fondasi tiang pancang terdapat beberapa metode yang dapat digunakan dalam menganalisis daya dukung tiang. Studi ini dilakukan dengan tujuan memberikan informasi metode mana yang dapat memaksimalkan kegiatan pemancangan. Faktor utama dalam pemancangan adalah kecocokan hammer yang akan digunakan terhadap daya dukung tiang. Dalam menganalisis daya dukung tiang dapat menggunakan metode statik dengan data hasil uji in-situ, metode dinamik yang berasal dari rekaman pemancangan, dan persamaan gelombang dengan bantuan software GRLWEAP. Analisis daya dukung ultimit dilakukan dengan metode statik memiliki tingkat akurasi mencapai rentang ±10% terhadap uji pembebanan statik. Hasil dari analisis daya dukung ultimit dengan penggunaan software GRLWEAP direkomendasikan ...
Abstract The 2018 MW 7.5 Palu-Donggala, Indonesia earthquake initiated a series of catastrophic f... more Abstract The 2018 MW 7.5 Palu-Donggala, Indonesia earthquake initiated a series of catastrophic flowslides that claimed the lives of several thousand people, making it the deadliest natural disaster of 2018. Three of the most significant flowslides, which occurred in the communities of Petobo, Jono Oge, and Lolu Village, were clustered within alluvial sediments of the Palu River Valley. Post-earthquake field reconnaissance, subsurface investigation, eyewitness interviews, and geomechanical analyses indicate that the failure sequence began when the earthquake ground motion raised pore water pressures in the saturated interbedded alluvial sediments. The flowslides were not coseismic but instead occurred several minutes after earthquake shaking ended. We hypothesize that high excess pore pressures created large hydraulic gradients within the alluvial sediments, which ultimately triggered progressive liquefaction that led to a redistribution of stresses and accumulation of shear strains. The flowslides were then initiated as gravitational driving stresses began to exceed the residual strength of the liquefied soil. Given the interbedded stratigraphy, we speculate that void redistribution and the development of water films possibly contributed to low residual strengths. An adjacent unlined agricultural canal played a critical role in the failure sequence by artificially raising the groundwater level, thereby increasing the susceptibility to liquefaction and attendant strength loss.
ABSTRACTIndonesia is a country located in the most active earthquake paths in the world. This mak... more ABSTRACTIndonesia is a country located in the most active earthquake paths in the world. This makes Indonesia prone to earthquakes and has the potential to experience liquefaction. Liquefaction can cause pile failure, so several things need to be considered in designing piles on potentially liquefied soils. One project in Sulawesi has a profile of uniform grained saturated soil that is susceptible to liquefaction. Two things that need to be considered in the design of piles on potentially liquefied soils is to ignore the capacity of pile friction and calculate the moment due to lateral spreading effects. Calculation of liquefaction potential is done by comparing the ratio of the cyclic stress and the cyclic resistance ratio and is compared by four other methods namely: the Seed et al. (2003), Tsuchida (1970), Seed et al. (2003), and Bray & Sancio (2004). The lateral spreading effect is calculated by referring to the JRA Code where the liquefied soil layer gives pressure to the pile ...
Development in Jakarta took place the most, but the condition of the land in Jakarta ehich was do... more Development in Jakarta took place the most, but the condition of the land in Jakarta ehich was dominated by sof soil was becoming an obstacle. Landfill is one way that can be done to strengthen or improve soft soil. But if this landfill causes a settlement in soil around the pile is bigger than the settlement in the pile, there will be negative skin friction which will cause the pile to be pulled down. This study aims to analyze and compare the magnitude of the influence of negative skin friction caused by the pile by using the undrained parameter, drained parameter, Meyerhof empirical, and Vesic empirical to analyze the carrying capacity of the pile and determine the neutral plane and negative skin friction with the Fellenius method and Prakash & Sharma methods. From the results of the analysis,negative skin friction does not accur in the pile that ends hard soil while it occurs in soil that ends soft soil. The location of neutral plane between the Fellenius method and Prakash & Sh...
As a city develops, less areas will be available for constructions. Out of these available lands,... more As a city develops, less areas will be available for constructions. Out of these available lands, a large quantity of areas has low soil bearing capacity and great amount of settlement. For this type of soil, loading is required in order to stabilize it. This will push out porewater contained inside the soil. However, reaching the expected settlement requires a long time, which can be solved by using prefabricated vertical drain to speed up the process. This is possible because prefabricated vertical drain decreases the travel distance of porewater to half of the vertical drain. Calculations for this thesis are done using one dimensional consolidation method, finite element method, and asaoka method for actual data calculation from the field. Using one dimensional consolidation method, with prefabricated vertical drain distance of 1.2 m in triangular pattern, resulted in settlement level of 2.048 m for 110 days. Using finite element method resulted in settlement level of 2.604 m for...
Basement development in the construction world has become common. The contractor is expected to b... more Basement development in the construction world has become common. The contractor is expected to be able to master the knowledge for the construction of the basement. In practice, it cannot use only one or two methods to be used in each field condition. Many things must be estimated to design a structure, in addition to choosing the shape of the retaining wall used, the selection of support becomes something that must really be considered by looking at field conditions. An example that must be considered in designing a retaining wall itself is the stress of the soil that must be calculated appropriately so as not to damage the retaining wall itself. In addition, the relationship used between projects with deep or shallow excavations. If the retaining wall is lacking or not strong enough to withstand the stresses of the soil, it must be assisted with a support system that will withstand some of the lateral pressure exerted by the soil. In this analysis, the focus of the discussion is ...
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
Deep foundations, especially cast-in-situ piles became popular and key support for most structure... more Deep foundations, especially cast-in-situ piles became popular and key support for most structures in limited land, so as Jakarta. The piles quality became highly dependent on the soil condition and the skill of the contactors. It’s underneath the ground and this makes inspection to its quality became much more difficult. There is many methods for inspection, either by destructive method, i.e. coring, to non-destructive method like low strain integrity test (PIT), cross-hole sonic logging (CSL) and latest is thermal integrity profiler (TIP). Some advances in applicating and evaluating the pile integrity discussed here as well as its advantages and limitations.
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
The foundation of the raft post is the bottom structure of a building that channeled the load fro... more The foundation of the raft post is the bottom structure of a building that channeled the load from the structure over the soil under it. Carrying capacity of drill pile foundation is influenced by the capacity of the pole tipand bearing capacity of the pole blanket. The decline in this area can be an immediate decline and a decrease in consolidation. This study aims to analyze the decrease of raft poles and the proportion of load bearing in the bogie area of the Kelapa Gading LRT warehouse depot - Jakarta. From the analysis of theNSPT test results in the field, the ultimate carrying capacity and the decrease that occurred on the raft poles were obtained. Based on the results of calculation of the ultimate carrying capacity of a single drill pole of 1.1 x 104 kN and the carrying capacity of the group is 1.1 x 108 kN. Calculation of group efficiency with the Feld method is obtained at a value of 0.588. In the calculation of the immediate decline of the pole, a value of 5 cm is obtaine...
The 28 September 2018 MW 7.5 Palu-Donggala earthquake caused massive flowslides within and nearby... more The 28 September 2018 MW 7.5 Palu-Donggala earthquake caused massive flowslides within and nearby the city of Palu. We performed post-earthquake reconnaissance at the flowslide sites and examine a large flowslide that occurred approximately 30 km south of Palu in Sibalaya. We performed field mapping, unmanned aerial vehicle flights, and eyewitness interviews. After the post-earthquake reconnaissance, we performed cone penetration tests. We developed hypothesized flowslide initiation and progression mechanisms from our collective reconnaissance efforts. Based on observed morphological features and eyewitness accounts, the flowslide initiated near a change from steep to shallow terrain. Significant liquefaction of the underlying soils initiated the flowslide after strong ground motions ceased. We speculate progressive liquefaction and/or void redistribution contributed to the timing and delay of initiation.
Tanah adalah salah satu bagian yang memegang peran penting dalam perencanaan konstruksi. Selain b... more Tanah adalah salah satu bagian yang memegang peran penting dalam perencanaan konstruksi. Selain bahan konstruksi tanah juga berguna sebagai pendukung yang menahan seluruh beban aksial dari suatu konstruksi. Dengan mengetahui jenis tanah dan parameter-parameter tanah kita dapat merencanakan suatu pondasi bangunan yang aman dan ekonomis. Parameter-parameter tanah dapat diperoleh dari hasil penyelidikan tanah. Salah satu cara penyelidikan tanah dilapangan yaitu dengan uji sondir (CPT) yang menghasilkan parameter-parameter tanah berupa qc, fs, dan FR. Parameter-parameter Nspt, c, f, gwet, gdry, dan gsat adalah parameter yang berguna dalam perencanaan konstruksi. Parameter-parameter Nspt, c, f, gwet, gdry, dan gsat dapat dihitung menggunakan korelasi yang didapat dengan melakukan regresi pada grafik hubungan qc terhadap Nspt sehingga menghasilkan korelasi untuk qc bernilai antara 0 sampai 20 kg/cm2 adalah Nspt = 0.25 qc, antara 20 sampai 90 kg/cm2 adalah Nspt = 0.2148 qc + 0.7143, dan ...
Pondasi tiang telah menjadi salah satu pilihan dalam suatu proyek infrastruktur dikarenakan fonda... more Pondasi tiang telah menjadi salah satu pilihan dalam suatu proyek infrastruktur dikarenakan fondasi tiang berfungsi meneruskan beban dari struktur diatasnya menuju lapisan tanah. Salah satu pilihan pondasi tiang adalah pondasi tiang pancang. Dalam proses desain untuk mencari daya dukung pondasi tiang terdapat beberapa kombinasi rumus baik di tanah pasir ataupun lempung, diantaranya adalah Meyerhof 1976, Lambda, Alpha, Beta, Tomlinson, Coyle Castello, Meyerhof 1956 dan deRuiter&Beringen. Hasil daya dukung dari rumus tersebut perlu diuji dilapangan dengan pembebanan statik dan dinamik. Kemudian untuk tiang pancang terdapat faktor yang mempengaruhi daya dukung salah satunya faktor soil setup. Hasil Analisis menunjukan tiang pancang yang terpasang pada tanah di daerah Cirebon dengan ukuran 400mm, 600mm dan 762mm dengan jenis spun pile dan steel pipe pile memiliki kecenderungan peningkatan daya dukung dengan kisaran 18-33% berdasarkan uji pembebanan statik dan dinamik selama 7 hari, dan ...
Dalam proyek teknik sipil, terutama proyek jalan raya, banyak masalah yang ditimbulkan oleh beban... more Dalam proyek teknik sipil, terutama proyek jalan raya, banyak masalah yang ditimbulkan oleh beban. Beban yang bekerja pada perkerasan jalan, seperti berat sendiri, beban lalu lintas, dan timbunan, dapat menimbulkan penurunan yang besar pada tanah. Salah satu usaha perkuatan yang sering digunakan adalah memasang geotekstil. Dalam studi ini akan dibandingkan besarnya penurunan dengan atau tidak menggunakan geotekstil dengan memperhatikan faktor keamanan terhadap berbagai kedalaman muka air tanah. Hasil studi menunjukkan bahwa penggunaan geotekstil dapat mengurangi penurunan pada tanah dasar bila dibandingkan dengan tidak menggunakan geotekstil dengan rata-rata 7,633% pada kondisi short term dan 4,113% pada kondisi long term selain itu terdapat peningkatan faktor keamanan rata-rata sebesar 2,064% pada kondisi short term dan 19,58% pada kondisi long term.
Dewasa ini tingkat pembangunan semakin meningkat mengikuti bertambahnya populasi penduduk. Pada u... more Dewasa ini tingkat pembangunan semakin meningkat mengikuti bertambahnya populasi penduduk. Pada umumnya lahan yang tersedia untuk pembangunan di kota-kota besar relatif kecil serta berhimpitan dengan bangunan-bangunan di sekitarnya sehingga di perlukannya alternatif teknik instalasi fondasi yang minim getaran. Inner boring merupakan sebuah teknologi pemasangan tiang fondasi pracetak (spun pile) yang mengkombinasikan metode drilling dan jacking dengan cara melubangi tanah dengan bor sambil memasukan tiang fondasi dengan cara di tekan. Tugas akhir ini membahas analisa perbandingan daya dukung fondasi dalam dengan metode instalasi Inner boring ,Pancang, dan Bored pile serta membandingkan dengan data uji beban-VWSG. Perhitungan daya dukung fondasi Inner boring menggunakan metode Nakabori Kakutei System (NAKS). Perhitungan daya dukung Pancang dihitung dengan membandingkan metode Meyerhof, Brown, dan Briaud .et.al. Sedangkan fondasi Bored pile dihitung dengan membandingkan metode Meyerhof...
The classification of radar targets is one of the most important study topics, especially in the ... more The classification of radar targets is one of the most important study topics, especially in the defense and automotive industries. However, in most of the studies in the literature, raw radar signals are used. Raw radar signals may be subject to ambient noise and signal modulation effects. This may make it difficult to classify radar targets. In this study, instead of using raw data, Fourier-based features extracted from Radar Cross-sectional Area have been used. These extracted features are then input to two types of classifiers, ie, Naive Bayes (NB) and Artificial Neural Networks (ANN) for the classification of radar targets. In addition, both classifiers were trained with different algorithms and their performances were compared. In the ANN-based classifiers, the best accuracy was found that 96.69% with using Bayesian regularization and back propagation training function. On the other hand, the best accuracy with the NB classifier was achieved at 93.95% using Epanechnikov Kernel Distribution. The result presented here demonstrates that Fourier transform based feature extraction can be used effectively in radar target classification applications.
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