四角钢组合约束型防屈曲支撑的轴压试验研究

发布时间：2018-03-30 12:24

本文选题：装配式　切入点：防屈曲支撑　出处：《土木工程学报》2017年04期

【摘要】：四角钢组合约束型防屈曲支撑具有轻量化及装配化等特点,其组成特点是采用高强度螺栓把4个外围约束角钢连接成整体,形成对内核构件的整体约束作用。该类防屈曲支撑受轴压荷载作用时,4个外围约束角钢之间以及内核与外围约束构件之间存在复杂的相互作用,外围约束构件受力状态复杂。文中进行了5根四角钢组合约束型防屈曲支撑在轴压循环荷载作用下的试验研究,考察其受力性能与破坏机理、轴压承载力与骨架曲线以及约束比参数对它们的影响。对试验试件建立精细化有限元模型(螺栓单元与接触单元),模拟分析其加载过程的应力与变形发展历程。通过对比各试件的试验实测结果、理论计算结果与精细有限元模拟分析结果,表明有限元分析结果可偏于安全地预测试件的实际受力状态;如果计入内核端部附加偏心距的影响,理论设计公式可用于这类防屈曲构件的承载力设计,具有较高的可靠性。
[Abstract]:Four-angle steel combination restrained buckling braces have the characteristics of lightweight and assembly. The composition characteristic is to use high strength bolts to connect the four peripheral restrained angle steel into a whole. When the buckling braces are subjected to axial compression load, there are complex interactions between the four peripheral restrained angle steels and between the core and the peripheral restrained members. In this paper, the stress behavior and failure mechanism of five four-angle steel composite buckling braces under cyclic axial compression are studied. The influence of axial compression capacity, skeleton curve and constraint ratio parameters on them was studied. A fine finite element model (bolt element and contact element) was established to simulate the development of stress and deformation in the loading process. By comparing the experimental results of each specimen, The theoretical calculation results and the fine finite element simulation results show that the finite element analysis results can safely predict the actual force state of the specimen, if the effect of the additional eccentricity at the end of the core is taken into account, The theoretical design formula can be used to design the bearing capacity of this kind of buckling member and has high reliability.
【作者单位】：清华大学;上海建工集团股份有限公司;西安交通大学;
【基金】：国家自然科学基金(51678340)
【分类号】：TU398.9

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