The Seismic Behavior of Critical Regions of Reinforced Concrete Components as Influenced by Moment,Shear and Axial Force,

摘要

Building response caused by moderate to severe earthquake excitation is often in the inelastic range;thus,to enable reliable predictions of overall performance,the energy absorption and failure characteristics of individual components must be established. For reinforced concrete frame buildings,the critical or yielding regions may occur in either or both the girders and columns subjected to various combinations of bending,shear,and axial load. To determine the characteristics and modes of failure of columns under excitations causing degradations in stiffness,strength,and energy absorption, a series of twelve members simulating a column between inflection points above and below a floor level were designed and tested dynamically. The variable parameters introduced were (1) magnitude of applied axial load chosen to represent lower,intermediate,and upper story columns, (2) lateral reinforcement percentage chosen to study the influence of confinement on ductility,and (3) history of controlled lateral displacement chosen to determine the effects of rate and sequence loading.