Under the action of seismic forces, joints of RC frame structures are subjected to large shear st... more Under the action of seismic forces, joints of RC frame structures are subjected to large shear stresses in the core. The seismic performance of RC frame structures is often governed by the behavior of its beam-column connections. This is especially true for the case of non-seismically designed frame structures that were constructed following old and seismically poor detailing practices. For correct assessment of seismic performance of such structures, it is essential to consider inelastic behavior and distortion of the joint core. The inelastic static (pushover) as well as nonlinear dynamic (time history) methods are popular tools for the seismic performance estimation of the structures. Nonlinear dynamic time history analysis is considered as the most accurate and reliable form of seismic analysis for structures. The analysis requires the definition of the strength envelope and hysteretic rule which interact with the step by step dynamic analysis. In case of gravity load designed (GLD) frame structures, the envelope and hysteretic rules are required not only for the members but also for the beam-column joints. This work reports the recently developed, practical and accurate models to realistically model the seismic response of RC structures considering joint distortion. The models are used to perform the inelastic cyclic analysis of beam-column joints and nonlinear dynamic analyses of a 2D frame structure tested under shake table tests. It is highlighted that with the numerical procedure followed, the seismic behavior including load-deflection response, joint deformation, failure modes etc., could be very well simulated.
... C. Alionso, J. Fullea, J. Polimonand J. Rodriguez PRO 19: Testing and Modelling the Chloride ... more ... C. Alionso, J. Fullea, J. Polimonand J. Rodriguez PRO 19: Testing and Modelling the Chloride ... with different 699 bond strengths Y.-J. Li and R. Eligehausen 70 Simulation of fastening systems ... inclined shoulder 729 P. Pivonka, R. Lackner and HA Mang 73 Simulating a response ...
... J. Rodriguez PRO 19: Testing and Modelling the Chloride Ingress into Concrete (ISBN: 2-912143... more ... J. Rodriguez PRO 19: Testing and Modelling the Chloride Ingress into Concrete (ISBN: 2-912143-22-5), Edited by C. Andrade PRO 20 ... shear 1046 connectors with powder actuated fasteners M. Fontana, H. Beck and R. Bartschi 101 Design concept of nailed shear connections ...
Local bond stress-slip relationships of deformed bars under generalized excitations: Experimental... more Local bond stress-slip relationships of deformed bars under generalized excitations: Experimental results and analytical model. R Eligehausen, EP Popov, VV Bertero NTIS, SPRINGFIELD, VA(USA), 1983, 190, 1983. This report ...
SUMMARY It is commonly agreed that before failure the RC structure must give a warning by crackin... more SUMMARY It is commonly agreed that before failure the RC structure must give a warning by cracking and visible deflections. This constitutes the requirements for the minimum reinforcement ratio. Research results suggest that minimum reinforcement ratio is member size dependant. The exact tendency is, however, not clear. In the lack of experimental data, extrapolation of member size dependence beyond the
Anchoring elements such as headed and expansion studs and grouted or undercut anchors, are often ... more Anchoring elements such as headed and expansion studs and grouted or undercut anchors, are often used for local transfer of loads inlo concrete members. In order to better understand the failure mechanism, a large number of experiments have been carried out in the past . Ho,\·cver. due to the complicated three-dimensional load transfer a. very few or no numerical studies have been performed for a. number of different fastening situations i.c. influence of the embedment depth, crack-width inftuence (fastening in cracked concrete), influence of the edge distance etc. Therefore, in the present study some results of the axisymmetric and three-dimensional numerical analysis of the headed studs embedded in plane concrete block are presented. Influence of different geometrical and material parameters have been studied employing finite element method and nonlocal microplane model. Comparison between experimental and numerical results indicate reasonable good agreement. Generally it has been observed that the failure mechanism is governed by fracture energy ralher than by tensile strength of concrete. As a consequence, the size effect is strong and close to linear elastic fracture mechanics.
Under the action of seismic forces, joints of RC frame structures are subjected to large shear st... more Under the action of seismic forces, joints of RC frame structures are subjected to large shear stresses in the core. The seismic performance of RC frame structures is often governed by the behavior of its beam-column connections. This is especially true for the case of non-seismically designed frame structures that were constructed following old and seismically poor detailing practices. For correct assessment of seismic performance of such structures, it is essential to consider inelastic behavior and distortion of the joint core. The inelastic static (pushover) as well as nonlinear dynamic (time history) methods are popular tools for the seismic performance estimation of the structures. Nonlinear dynamic time history analysis is considered as the most accurate and reliable form of seismic analysis for structures. The analysis requires the definition of the strength envelope and hysteretic rule which interact with the step by step dynamic analysis. In case of gravity load designed (GLD) frame structures, the envelope and hysteretic rules are required not only for the members but also for the beam-column joints. This work reports the recently developed, practical and accurate models to realistically model the seismic response of RC structures considering joint distortion. The models are used to perform the inelastic cyclic analysis of beam-column joints and nonlinear dynamic analyses of a 2D frame structure tested under shake table tests. It is highlighted that with the numerical procedure followed, the seismic behavior including load-deflection response, joint deformation, failure modes etc., could be very well simulated.
... C. Alionso, J. Fullea, J. Polimonand J. Rodriguez PRO 19: Testing and Modelling the Chloride ... more ... C. Alionso, J. Fullea, J. Polimonand J. Rodriguez PRO 19: Testing and Modelling the Chloride ... with different 699 bond strengths Y.-J. Li and R. Eligehausen 70 Simulation of fastening systems ... inclined shoulder 729 P. Pivonka, R. Lackner and HA Mang 73 Simulating a response ...
... J. Rodriguez PRO 19: Testing and Modelling the Chloride Ingress into Concrete (ISBN: 2-912143... more ... J. Rodriguez PRO 19: Testing and Modelling the Chloride Ingress into Concrete (ISBN: 2-912143-22-5), Edited by C. Andrade PRO 20 ... shear 1046 connectors with powder actuated fasteners M. Fontana, H. Beck and R. Bartschi 101 Design concept of nailed shear connections ...
Local bond stress-slip relationships of deformed bars under generalized excitations: Experimental... more Local bond stress-slip relationships of deformed bars under generalized excitations: Experimental results and analytical model. R Eligehausen, EP Popov, VV Bertero NTIS, SPRINGFIELD, VA(USA), 1983, 190, 1983. This report ...
SUMMARY It is commonly agreed that before failure the RC structure must give a warning by crackin... more SUMMARY It is commonly agreed that before failure the RC structure must give a warning by cracking and visible deflections. This constitutes the requirements for the minimum reinforcement ratio. Research results suggest that minimum reinforcement ratio is member size dependant. The exact tendency is, however, not clear. In the lack of experimental data, extrapolation of member size dependence beyond the
Anchoring elements such as headed and expansion studs and grouted or undercut anchors, are often ... more Anchoring elements such as headed and expansion studs and grouted or undercut anchors, are often used for local transfer of loads inlo concrete members. In order to better understand the failure mechanism, a large number of experiments have been carried out in the past . Ho,\·cver. due to the complicated three-dimensional load transfer a. very few or no numerical studies have been performed for a. number of different fastening situations i.c. influence of the embedment depth, crack-width inftuence (fastening in cracked concrete), influence of the edge distance etc. Therefore, in the present study some results of the axisymmetric and three-dimensional numerical analysis of the headed studs embedded in plane concrete block are presented. Influence of different geometrical and material parameters have been studied employing finite element method and nonlocal microplane model. Comparison between experimental and numerical results indicate reasonable good agreement. Generally it has been observed that the failure mechanism is governed by fracture energy ralher than by tensile strength of concrete. As a consequence, the size effect is strong and close to linear elastic fracture mechanics.
Uploads
Papers by R. Eligehausen