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介绍一种耗能屈曲约束支撑循环结构性能的数值模型,该支撑常用来替代传统的轴向支撑作为框架结构和其他结构中的抗震构件。这些支撑通常由1根细长的插入短粗套管中的钢芯组成,套管是预先设置的,以防止其受压时屈曲。套管由砂浆或钢构成,在钢芯和套管间设置滑移面以阻止剪应力过度传递。钢芯的性能、砂浆套管的性能和界面的滑移性能分别通过塑性破坏模型、各向同性的破坏模型和罚函数模型来描述。按照给出的公式通过ABAQUS软件完成了这3个模型的建模。在许多典型但简单的工况下,该算法被证实可以模拟屈曲约束支撑的循环性能。模型模拟结果与试验结果吻合较好,证实了其正确性。对初步得到的结论进行讨论并指出进一步研究的方向。
A numerical model of buckling-restrained cyclic structures is presented, which is often used as an alternative to the traditional axial brace as a seismic element in frame structures and other structures. These supports usually consist of a single elongated steel core inserted into a stub sleeve that is pre-set to prevent buckling when pressed. The casing is made of mortar or steel, and a sliding surface is provided between the steel core and the casing to prevent over-transmission of shear stress. The performance of the steel core, the properties of the mortar casing and the slippage of the interface are described respectively by the plastic failure model, the isotropic failure model and the penalty function model. According to the formula given by ABAQUS software to complete the modeling of these three models. In many typical but simple cases, the algorithm has been shown to simulate cyclic performance of buckling restraints. The model simulation results are in good agreement with the experimental results, confirming its correctness. Discuss the preliminary conclusions and point out the direction of further research.