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以兰州金茂大厦为背景,选取其伸臂桁架的高度、跨度和截面尺寸作为变量,设计了5种不同布置形式普通伸臂桁架和相应的5种屈曲约束支撑型消能减震伸臂桁架,采用ANSYS有限元软件进行了静力非线性分析和滞回加载分析,应用目标函数法进行优化对比。结果表明:在5种普通伸臂桁架和相应的5种屈曲约束支撑型伸臂桁架中,双跨对角斜撑型布置形式分别为两类不同伸臂桁架中满足抗震要求的最优布置形式。在满足等刚度的原则下,屈曲约束支撑型伸臂桁架耗能能力明显高于普通伸臂桁架。采用双跨对角斜撑型布置形式的屈曲约束支撑型伸臂桁架是抗震性能更优的伸臂桁架布置形式。
Taking the Jinmao Tower in Lanzhou as the background, the elevations and spans of the trussed boom truss are selected as the variables. Five types of ordinary telescopic trusses with different layouts and corresponding five kinds of cantilever beam-supported truss girders , ANSYS finite element software for static nonlinear analysis and hysteresis loading analysis, the application of objective function method to optimize contrast. The results show that in the five kinds of normal telescopic trusses and the corresponding five kinds of support type telescopic truss truss, the diagonal diagonal bracing arrangement is the optimal arrangement of two kinds of different telescopic truss to meet the seismic requirements . Under the principle of equal stiffness, the energy dissipation capacity of the braced yoke with buckling restraint is obviously higher than that of ordinary yoke truss. The buckling-restrained telescopic truss with double-span diagonal bracing arrangement is a kind of telescopic truss arrangement with better seismic performance.