摘要
钢管混凝土桩在超高层建筑中使用最为广泛,而已有的高层建筑抗侧力优化设计的位移约束条件显式表达方法的公式推导中,其研究对象多只限于矩形截面构件。本文采用虚功原理推导了圆形钢管混凝土截面的位移约束条件的显式表达公式,并在优化设计过程中用到的基于刚度等效原则的等效直径计算方法,将钢管混凝土等效为素混凝土柱,进而调用SAP2000应用程序接口(API)设计程序进行结构优化设计,以一由矩形截面梁和钢管混凝土柱组成的简单平面框架结构为案例,进行风荷载作用下的结构优化设计,验证了本文公式推导的正确性以及优化收敛过程的稳定性。
Concrete-filled steel tube （CFST） columns are widely used in constructions of super-tall buildings. However, most reported lectures on lateral-force resistant structural optimization of super-tall buildings merely concern on some simple structural elements such as rectangular cross-section beams or columns. In this study, based on the principle of virtual work, the explicit function of displacement constraints of structures with circular cross-section CFST tubes is deduced, and then, a method for evaluating the equivalent diameter is proposed, based on which plain concrete columns with the equivalent diameter takes place of CFST columns when setting the cross- section properties using SAP 2000 API. Finally, a 24-storey plane frame structure is considered to verify the effectiveness of the deduced formula. It is acted by lateral wind loads and optimized using the deduced formulas, some selected results are presented to illustrate the correctness of the deduced formulas and the stability of the optimization procedure.
出处
《建筑科学》
CSCD
北大核心
2015年第11期8-15,共8页
Building Science
基金
国家自然科学基金(51208127
51478130
51378134)
广州市科技计划项目(2014J4100141)
广东省自然科学基金项目(S2012010009831)
关键词
钢管混凝土
显式位移约束函数
等效直径
最优准则法
concrete-filled steel tube
explicit displacement constraint function
equivalent diameter
optimality criteria
