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为研究强震作用下结构发生局部屈曲造成损伤对钢框架结构抗震性能的影响,采用通用有限元软件ABAQUS,分别建立杆系模型以及三维精细钢框架模型,比较了是否考虑累积损伤抗震指标的差异。应用国内外典型试验结果,验证了三维精细模型对模拟局部屈曲累积损伤现象的准确性及适用性。在此基础上,建立杆系和三维精细壳单元有限元模型,分别进行拟静力加载以及罕遇地震作用下的弹塑性时程分析,对比了结构变形、滞回耗能、破坏形态等方面的特征。研究结果表明:加载初期,杆系模型和三维精细壳单元模型计算结果基本一致;随着结构损伤累积,两者出现明显的差别,杆系模型会低估结构的变形大小以及塑性发展程度。
In order to study the effect of local buckling damage caused by strong earthquake on the seismic performance of steel frame structure, the general finite element software ABAQUS was used to establish the rod model and the three-dimensional fine steel frame model respectively, and whether the cumulative damage anti-seismic index . The results of typical tests at home and abroad are used to verify the accuracy and applicability of three-dimensional fine model in simulating the cumulative damage of local buckling. On this basis, the finite element model of the rod system and the three-dimensional fine shell element are established, and the elasto-plastic time-history analysis under quasi-static loading and rare earthquakes respectively is carried out. The structural deformation, hysteresis energy consumption and damage morphology are compared Characteristics. The results show that the calculation results of the rod model and the three-dimensional fine shell element model are basically the same at the initial stage of loading. With the structural damage accumulation, there is a clear difference between the two. The rod model will underestimate the deformation and the degree of plasticity.