型钢混凝土异形柱正截面承载力的理论研究

Theoretical research on bearing capacity of normal cross section of SRC special-shaped columns

在试验研究基础上,根据型钢混凝土(SRC)异形柱的工作机理,对SRC异形柱的正截面承载力进行有限元数值分析,把型钢和混凝土分别进行单元划分,对型钢单元采用不同的坐标系进行处理,并且只考虑混凝土除去型钢所占截面后的净面积,利用数值迭代法编写了一套SRC异形柱正截面承载力分析的计算机程序,该程序可得到SRC异形柱正截面承载力的N-M及Mx-My相关曲线,并能够计算SRC异形柱构件的极限承载力,计算结果与试验结果吻合较好.利用该程序对SRC异形柱正截面承载力的变化规律进行了分析,得到了一些重要结论.最后进行了SRC异形柱的实用设计方法探讨.

Based on the experimental study, and according to the action behavior of SRC special-shaped columns, finite element numerical analysis for the bearing capacity of normal cross section of SRC speclal-shaped columns is presented. Shape steel and concrete section element is divided, different coordinate system is adopted for the shape steel element, and only the concrete net section is considered. The computer programs of calculation of M-N interaction curve and Mx- My interaction curve are compiled by using numerical iterative method. With this program, we can calculate the ultimate strength of SRC speclal-shaped columns. The comparison between theoretical results and experimental results shows satisfactory agreement. Furthermore, with this program, we analyzed the variation regularity of the normal section bearing capacity of SRC speclal-columns, and arrived at some important conclusions. Finally, an initial research about the practical designing method for SRC special-shaped columns is given.