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Local Deformation Measures for RC Column Shear Failures Leading to Collapse
A novel model capable of simulating shear strength degradation of pre 1970's reinforced concrete columns detailed for gravity load resistance and subjected to large seismic loads is presented. The model can account for both in-cyclic as well as cyclic shear damage up to complete loss of lateral strength and stiffness. The model has been implemented in the open source analysis software OpenSees and tested with a large column database. The proposed model utilizes localized column end-rotations, axial loads, and pertinent column properties to assess column shear capacity and trigger shear failure. Once shear failure is triggered, the analytical model modifies the column response by introducing softening and cyclic degradation in the constitutive properties of a zero-length shear spring element. The zero-length shear spring can be attached in series to any column element. Past investigitions have demonstrated that axial collapse in gravity detailed reinforced concrete columns will only occur after damage has become extensive and the shear strength is almost exhausted. Thus accurate column collapse assessment necessitates adequate modeling of shear strength degradation up to the critical limit that initiates axial collapse. The proposed shear failure model is capable of accomplishing this task and has been developed with the objective of improving the accuracy of collapse risk assessment efforts targeting pre 1970's reinforced concrete columns detailed for gravity load resistance.
Local Deformation Measures for RC Column Shear Failures Leading to Collapse
A novel model capable of simulating shear strength degradation of pre 1970's reinforced concrete columns detailed for gravity load resistance and subjected to large seismic loads is presented. The model can account for both in-cyclic as well as cyclic shear damage up to complete loss of lateral strength and stiffness. The model has been implemented in the open source analysis software OpenSees and tested with a large column database. The proposed model utilizes localized column end-rotations, axial loads, and pertinent column properties to assess column shear capacity and trigger shear failure. Once shear failure is triggered, the analytical model modifies the column response by introducing softening and cyclic degradation in the constitutive properties of a zero-length shear spring element. The zero-length shear spring can be attached in series to any column element. Past investigitions have demonstrated that axial collapse in gravity detailed reinforced concrete columns will only occur after damage has become extensive and the shear strength is almost exhausted. Thus accurate column collapse assessment necessitates adequate modeling of shear strength degradation up to the critical limit that initiates axial collapse. The proposed shear failure model is capable of accomplishing this task and has been developed with the objective of improving the accuracy of collapse risk assessment efforts targeting pre 1970's reinforced concrete columns detailed for gravity load resistance.
Local Deformation Measures for RC Column Shear Failures Leading to Collapse
LeBorgne, Matthew R. (author) / Ghannoum, Wassim M. (author)
ATC and SEI Conference on Improving the Seismic Performance of Existing Buildings and Other Structures ; 2009 ; San Francisco, California, United States
2009-12-07
Conference paper
Electronic Resource
English
Local Deformation Measures for RC Column Shear Failures Leading to Collapse
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