Using Macro Elements to Predict Near-Collapse Performance of Two Typical RC Building Structural Systems with Lightly Reinforced Walls and Slender Precast Columns

Abstract eng:
The emerging performance based procedures call for more complex models able to monitor near-collapse behavior. Are macro models, defined as an assemblage of inelastic springs controlled by force-deformation relations, able to describe such behavior? The ability of the multiple-vertical-line-element model to predict seismic response of lightly reinforced RC structural walls as well as the performance of the lumped plasticity beam-column model in the case of slender columns in RC precast industrial buildings were studied. Presented examples have demonstrated that macro elements could be used in predicting global near-collapse performance, if adequate experimental background was provided. While near-collapse flexural behavior of RC structural walls was adequately modeled in advance to the experiments, additional research of shear behavior as well as the shear behavior of coupling beams has been needed. Semi-empirical models were used to calibrate the lumped plasticity element empoyed to describe the post-critical behavior of slender precast columns. It was concluded that these models, which were developed for much lower shear-span ratios, cannot be used for such slender columns without additional considerations and modifications. An appropriately modified lumped plasticity model incorporating in-cycle and repeated-cycle strength deterioration was chosen for the future use in the performance-based design and seismic risk studies.

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