【摘要】 目前对于钢筋混凝土框架的数值模拟大多没有考虑柱子底部纵筋的滑移。基于OpenSEES平台对一榀三层三跨的带有翼缘板的混凝土框架多点位移控制的低周反复加载试验进行模拟。通过在柱纤维单元下串联一个零长度截面单元来模拟底层柱脚的应变渗透现象,用bond-slip材料定义柱底纵筋的粘结滑移关系。数值模拟结果表明:考虑柱底纵筋滑移模型较不考虑柱底纵筋滑移模型与实验结果吻合更好,但是后期模拟值略小于实验值。因此,柱底纵筋应力滑移模型仍需进一步试验研究和验证。更多还原

【Abstract】 Most numerical simulations of the concrete frame neglect the rebar slippage at the column base so far.This paper uses the OpenSEES to conduct numerical simulation of a concrete frame under reversed-cyclic loads.Based on the fiber model,a zero-length section element was combined at the bottom with the nonlinear beam-column element,which was used to simulate the bar slippage at column ends.This proposed model is better than the conventional model because it close not needs to consider slippage in the earlier stage.But the result still shows some differences against the test result.Further experimental study should be done to calibrate the bar stress-slip relation at column base.更多还原