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对一个8层钢桁架系统的1∶8缩尺模型在低周反复荷载作用下的性能进行试验研究。试验中,对滞回曲线、骨架曲线和其他相关的变形进行了检测。同时对系统抗震性能,如屈服荷载、变形、延性、耗能、强度和刚度退化等进行了分析。然而,由于钢桁架体系参数的多样性和试验模型的某些特性,本次试验研究并不十分全面。因此,采用AN-SYS软件对模型进行了有限元分析。该有限元模型中考虑了材料和几何非线性,并通过与试验结果对比,证实了其有效性。随后,运用该有限元模型研究了结构参数,如结构高度、高宽比、桁架类型、底层桁架的布置、桁架跨高比和腹板的开口长度的变化,以及它们对于体系抗震性能的影响。基于试验及有限元分析结果,对桁架体系的抗震设计提出了一些建议。
Experimental research on the performance of a 1: 8 scale model of an 8-story steel truss system under low cyclic loading is carried out. In the test, hysteresis curves, skeleton curves and other related deformations were examined. At the same time, the seismic performance of the system such as yield load, deformation, ductility, energy consumption, strength and stiffness degradation were analyzed. However, due to the variety of steel truss system parameters and some characteristics of the test model, the experimental study is not very comprehensive. Therefore, AN-SYS software was used to analyze the model. The finite element model considers the material and geometric nonlinearity, and its effectiveness is verified by comparison with the experimental results. Subsequently, the structural parameters, such as the structural height, aspect ratio, truss type, the arrangement of the bottom truss, the span-to-height ratio of the truss and the opening length of the web, and their influence on the seismic performance of the system were studied using this finite element model. Based on the experimental and finite element analysis results, some suggestions for the seismic design of truss system are put forward.