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分别对单跨2层1/3比例的方钢管混凝土框架内置两侧开洞薄钢板剪力墙和未开洞薄钢板剪力墙进行了低周反复荷载试验,对比分析了方钢管混凝土框架内置薄钢板剪力墙的受力机理和破坏机制。采用有限元软件ABAQUS对试验试件进行了非线性数值分析,并将数值分析结果与试验结果进行对比,研究其抗震性能。结果表明:方钢管混凝土框架内置两侧开洞和未开洞薄钢板剪力墙均具有较高的承载力、良好的耗能能力和刚度,破坏机制符合“弱板强框架”的抗震理念,基本达到双重抗震设防目标。利用有限元足尺模型研究了钢板剪力墙开洞率、轴压比对结构抗震性能的影响,结果表明:开洞率的增大使结构承载力和耗能能力减小,但对刚度退化影响较小;轴压比对结构承载力、滞回耗能和刚度退化等影响很小。
The low-cycle cyclic loading tests were carried out for the thin-walled shear walls with open holes on both sides of the single-span 1/2-story 1/3-square-section square CFST frames, respectively. Mechanisms of stress and failure mechanism of thin steel plate shear walls. The finite element software ABAQUS was used to conduct the nonlinear numerical analysis of the test specimen. The numerical analysis results were compared with the test results to study the seismic performance. The results show that the built-in CFST frame with both open and unopened sheet steel shear walls have high bearing capacity, good energy dissipation capacity and stiffness, and the failure mechanism accords with the “weak plate strong frame” Concept, basically reached the goal of double seismic fortification. The effect of hole ratio and axial compression ratio on the seismic performance of the structure is studied by finite element model. The results show that the bearing capacity and energy dissipation capacity decrease with the increase of the hole opening rate, but the effect on the stiffness degradation Smaller; axial compression ratio on the structural capacity, hysteretic energy loss and stiffness degradation is small.