Papers by Anastasia Eleftheriadou
Open Journal of Civil Engineering, 2013
The sufficient estimation of the natural period of vibration constitutes an essential step in ear... more The sufficient estimation of the natural period of vibration constitutes an essential step in earthquake design and assessment and its role in the development of seismic damage is investigated in the current research. The fundamental period is estimated for typical reinforced concrete building types, representative of the building stock of Southern Europe, according to existing relationships. The building typologies also represent groups of 180,945 existing damaged buildings of an observational database created after the Athens (7-9-1999) near field earthquake. The estimated fundamental periods are correlated to several degrees of the recorded damage. Important conclusions are drawn on the parameters (height, structural type, etc.) that influence the seismic response and the development of damage based on the wide database. After conducting a correlation analysis, noticeable is the difference between the seismic demand of the elastic spectrum of the first (1959), the contemporary (2003) Greek Seismic Code and the values of peak ground accelerations of several Athens earthquake records. Moreover, PGAs in most records are often between the lower and the upper bound of the estimated fundamental periods for RC buildings with regular infills (n-normal) and with ground levels without infill panels (p-pilotis) regardless the height. A disparity is noticed when the estimated fundamental period is based on EC8 provisions for the considered as "high" buildings in S. Europe regarding the referring earthquake. The majority of buildings that developed several degree, type and extent of damage are considered of "low" height with estimated fundamental periods close to the PGA values of Athens earthquake ground motions. However, the developed damage was the result of the combination of parameters based on geological, tectonic and morphological characteristics of the affected area. In addition, a damage scale for the measurable recording, beyond the qualitative characterization of seismic damage in Greek post-earthquake surveys, is presented wherein the performance levels are defined according to the physical description of the seismic damage and, as well, in terms of structural and economic damage index.
Development of damage probability matrices based on Greek earthquake damage data
Earthquake Engineering and Engineering Vibration, Mar 1, 2011
Seismic Assessment, Rehabilitation and Retrofit of a Cultural Heritage Church Through Simulation
The current paper presents a procedure for earthquake resistant assessment of Cultural Heritage m... more The current paper presents a procedure for earthquake resistant assessment of Cultural Heritage masonry structural systems using rehabilitation and retrofitting measures. The Monastery of St. John the Baptist (15061507 A.D.) on the Island of Ioannina was selected as a case study for illustration. The seismic vulnerability was assessed after the: (a) historical investigation of the building, (b) detailed geometrical relieves, (c) identification of materials by means of surveys and of the physical and mechanical properties of the stone blocks and mortar, (e) foundation soil characterization, (f) dynamic identification of the structure by means of a refined Finite Element model. The FE model was used to assess the safety level of the building according to the provisions of Eurocode 8 using planar (masonry walls) and linear (steel ties) finite elements. The rehabilitation and retrofitting measures aimed at eliminating the causes of the damages and securing the structural elements with i...
The paper presents thoroughly the process for the analytical estimation of reinforced concrete st... more The paper presents thoroughly the process for the analytical estimation of reinforced concrete structures structural vulnerability. In order to achieve this purpose, both nonlinear static and dynamic analysis have been implemented on a 3D standard reinforced concrete moment resisting building and the seismic response is obtained analytically by both methods. The selected building for illustration was designed according to older seismic codes and regulations (Hellenic Code of 1959) and without conforming to modern seismic detailing requirements. The 3D model was subjected to conventional Static Pushover Analysis and bidirectional Incremental Dynamic Analysis (IDA) with the use of SAP 2000 software program. IDA involves nonlinear dynamic analyses of the structural model under a suite of ground motion records, each scaled to several intensity levels designed to represent the structure’s behaviour ranging from elasticity to final global instability. The structural performance of the RC ...
Analytical Estimation of Vulnerability Functions for RC Structures
Συσχέτιση και Ομογενοποίηση των Υφιστάμενων Κλιμάκων Βλάβης σε Κατασκευές Ωπλισμένου Σκυροδέματος (Correlation and Homogenization of Existing Damage Scales for Reinforced Concrete Structures)
Αναλυτική Αποτίμηση της Σεισμικής Τρωτότητας Κατασκευών από Ωπλισμένο Σκυρόδεμα (Analytical Assessment of Seismic Vulnerability for Reinforced Concrete Structures)
Αποτίμηση της Σεισμικής Τρωτότητας με Μητρώα Πιθανότητας Βλάβης (Seismic Vulnerability Assessment with Damage Probability Matrices)
Empirical Seismic Vulnerability Evaluation Based on Earthquake Damage Data
Seismic Vulnerability and Risk Assessment of the Building Stock of Attica (Greece) and Correlation to the Actual Repair Cost
Fundamental Period versus Seismic Damage for Reinforced Concrete Buildings
Open Journal of Civil Engineering, 2013
The sufficient estimation of the natural period of vibration constitutes an essential step in ear... more The sufficient estimation of the natural period of vibration constitutes an essential step in earthquake design and assessment and its role in the development of seismic damage is investigated in the current research. The fundamental period is estimated for typical reinforced concrete building types, representative of the building stock of Southern Europe, according to existing relationships. The building typologies also represent groups of 180,945 existing damaged buildings of an observational database created after the Athens (7-9-1999) near field earthquake. The estimated fundamental periods are correlated to several degrees of the recorded damage. Important conclusions are drawn on the parameters (height, structural type, etc.) that influence the seismic response and the development of damage based on the wide database. After conducting a correlation analysis, noticeable is the difference between the seismic demand of the elastic spectrum of the first (1959), the contemporary (2003) Greek Seismic Code and the values of peak ground accelerations of several Athens earthquake records. Moreover, PGAs in most records are often between the lower and the upper bound of the estimated fundamental periods for RC buildings with regular infills (n-normal) and with ground levels without infill panels (p-pilotis) regardless the height. A disparity is noticed when the estimated fundamental period is based on EC8 provisions for the considered as "high" buildings in S. Europe regarding the referring earthquake. The majority of buildings that developed several degree, type and extent of damage are considered of "low" height with estimated fundamental periods close to the PGA values of Athens earthquake ground motions. However, the developed damage was the result of the combination of parameters based on geological, tectonic and morphological characteristics of the affected area. In addition, a damage scale for the measurable recording, beyond the qualitative characterization of seismic damage in Greek post-earthquake surveys, is presented wherein the performance levels are defined according to the physical description of the seismic damage and, as well, in terms of structural and economic damage index.
Seismic Risk Assessment of Buildings in the Extended Urban Region of Athens and Comparison with the Repair Cost
Open Journal of Earthquake Research, 2014
Development of damage probability matrices based on Greek earthquake damage data
Earthquake Engineering and Engineering Vibration, 2011
Seismic Risk Assessment of Buildings in the Extended Urban Region of Athens and Comparison with the Repair Cost
Open journal of earthquake research, 2014
The current paper presents an extensive bottom-up framework for assessing building sector-specifi... more The current paper presents an extensive bottom-up framework for assessing building sector-specific vulnerability to climate change: energy supply and demand. The research focuses on the application of downscaled seasonal models for estimating energy performance of buildings in Greece. The ARW-WRF model has been set-up and suitably parameterized to produce downscaled climatological fields for Greece, forced by the output of the CFSv2 model. The outer domain, D01/Europe, included 345 x 345 cells of horizontal resolution 20 x 20 km2 and the inner domain, D02/Greece, comprised 180 x 180 cells of 5 x 5 km2 horizontal resolution. The model run has been setup for a period with a forecast horizon of 6 months, storing outputs on a six hourly basis.
The suitability of high resolution downscaled seasonal models for the energy assessment of the building sector
Energy and Buildings, 2016
ABSTRACT
The Application of High Resolution Seasonal Downscaled Models for the Energy Performance of Buildings
ABSTRACT
Assessing climate change impacts in Greece through localized impact assessment models
The Mediterranean region is generally acknowledged to be a very sensitive region to climatic pres... more The Mediterranean region is generally acknowledged to be a very sensitive region to climatic pressures (e.g. IPCC AR4 report, UNEP-MAP) being located at the intersection of the desert climate of Africa and the European continental climate. The complicated topography and strong sea-atmosphere interactions give rise to many small scale features and local patterns which require particular consideration and the application of downscaling modeling frameworks. According to (Giorgi 2006) it has been identified as one of the most prominent “Hot-Spots” in future climate change projections. Furthermore, as the economic activity in the majority of the Mediterranean countries is heavily influenced by the climate conditions (e.g. agriculture, tourism) climate deviations from normality are expected to significantly influence the lives of millions of exposed people. As current estimates (JRC PESETA project, Bank of Greece study, 2011) put climate impact costs to the order of billions of Euros, the...
A methodology is presented for the empirical vulnerability assessment of typical building types, ... more A methodology is presented for the empirical vulnerability assessment of typical building types, representative of the building stock of Southern Europe, based on processing of a large set of statistical data. The observational database is obtained from post-earthquake surveys carried out after the 7-9-1999 Athens earthquake and comprises 180.945 damaged buildings. A damage scale is presented wherein the performance levels are defined according to the physical description of the seismic damage and, as well, in terms of structural and economical damage index. The seismic demand is described by estimating the macroseismic intensity for each region. The relative frequency of the different damage states, for each structural type and each intensity level, is computed, in terms of damage ratio by evaluating the ratio of the number of damaged buildings belonging to a specified structural type and a region with a certain intensity level, to the total number of buildings of the same region and building class. Following the pre-described methodology damage probability matrices (DPM) and vulnerability curves are obtained for specific structural types.
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Papers by Anastasia Eleftheriadou