RC框架-框桁式复合墙抗震性能试验研究及有限元分析

Experimental study and numerical analysis on seismic behaviors of RC frame-frame truss composite wall

摘要

为了提高钢筋混凝土（reinforced concrete，RC）框架的抗侧能力，提出RC框架-框桁式复合墙（frame truss composite wall，FTCW）结构，并对2个缩尺比例为1:2的RC框架-FTCW试件进行了拟静力试验。通过试验现象、滞回曲线、骨架曲线和刚度退化曲线，对其承载力、延性、刚度退化等抗震性能进行了分析。通过ABAQUS软件对可能影响RC框架-FTCW骨架曲线的因素进行了拓展研究，包括不同内填FTCW数量、框架柱配筋率、轴压比、混凝土强度、内嵌角钢及内填墙片布置方向。结果表明：内嵌墙体先于RC框架被破坏，而在墙体内部，内斜撑先于外框被破坏，从而形成一个多级能耗系统，达到抗震设计的目的；提高RC框架-FTCW承载力最有效的方式是增加内填FTCW的数量，其次是增大框架柱的配筋率，而增大轴压比和混凝土强度或在FTCW中内斜撑增设角钢对承载力的提高作用较小；另外，FTCW布置方向的影响是不可忽略的，FTCW的数量和位置应该对称布置。

Abstract

Against the characteristic of large deformation for reinforced concrete (RC) frame，RC frame-frame truss composite wall (FTCW) structure was proposed，and two reinforced concrete (RC) frame-frame truss composite wall (FTCW) specimens with a scale of 1:2 were implemented for cyclic loading test.The seismic performance of bearing capacity，ductility and stiffness degradation were analyzed by the test phenomenon，hysteresis curves，backbone curves and stiffness degradation curves.The simulation of cyclic loading test was conducted by ABAQUS software，and the results were compared with the test results.The influence of the amount of infill FTCW，rebar ratio of RC frame columns，axial compression ratio，concrete strength，embedded angle steel and the layout direction of FTCW were analyzed.The test behaviors showed that a multistage energy consuming system that FTCW worked before RC frame and the internal diagonal struts worked before the outer frame inside the FTCW，forming a multistage energy consumption system for the design purpose of earthquake resistant structures.The numerical analysis results showed that the most effective way to improve the bearing capacity of RC frame-FTCW was to increase the amount of filled FTCW，followed by increasing the rebar ratio of frame columns，and the improvement of increasing the concrete strength or adding angle steel for the internal diagonal struts were smaller.The improvement of axial compression ratio on the bearing capacity was unnoticeable.In addition，the layout direction of FTCW was significant，and the number and position of FTCW should be symmetrically arranged.

关键词

RC框架-框桁式复合墙 / 拟静力试验 / 多级能耗系统 / 数值分析

Key words

reinforced concrete (RC) frame-frame truss composite wall(FTCW) / cyclic loading test / multistage energy consuming system / numerical analysis

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基金资助

国家自然科学基金资助项目(51508463)

陕西省自然科学基础研究计划资助项目(2019JQ-727)