基于非延性RC结构的侧向抗倒塌性能研究

Study on lateral collapse resistance based on non-ductile RC structures

我国存在大量已建非延性钢筋混凝土(RC)框架结构,这类结构在遭受强震作用时存在破坏甚至倒塌的风险而急需加固,采用拟静力分析方法对以五层RC框架结构为代表的多层RC结构进行抗震性能研究是一种很有效的途径。研究结果表明基于已有的试验数据采用OpenSees有限元验证了未加固和加固RC结构数值模拟的正确性,表明了未加固RC结构首先在结构底层柱下端塑性铰区出现损伤破坏,且同一楼层边柱塑性铰区较中柱损伤严重,逐渐向顶层塑性铰区发展最终使整体框架结构整体发生破坏直至失效倒塌;加固RC结构相对于未加固结构塑性铰发展迟缓不充分且有延缓塑性铰破坏的能力和良好的滞后性能。

At present, there have a large number of non -ductile reinforced concrete（RC） frame structures in China, which need to be reinforced in the event of strong earthquake. Therefore, the quasi - static analysis method has been adopted to analyse the seismic performance of multi - story RC structure. The results show that the correctness of the unstiffened and reinforced RC structures has been verified by the OpenSees finite element method based on the existing experimental data, showing that the RC structure damaged first in the plastic hinge region of the bottom column and the plastic hinge area was more serious than the center column, and gradually devel- oped toward the top plastic hinge area. Finally, the whole frame structure was damaged and even collapsed. The retarded development of reinforced RC structure relative to the plastic hinge was not enough and delayed plastic hinge failure with good hysteresis performance.