含格构化体系柱RC框架的鲁棒性分析

为了对含格构化体系柱RC框架进行鲁棒性研究,该文提出了一种基于抗力利用率的构件易损性系数量化方法,并改进了结构鲁棒性系数的计算。分析比较了4个含不同格构化体系柱RC框架的构件重要性系数、构件易损性系数以及结构鲁棒性系数。分析结果表明：支撑能够降低框架的构件重要性系数和易损性系数,从而提高结构的鲁棒性,且鲁棒性系数受支撑强度的影响,当支撑为易损构件时,支撑越强,结构鲁棒性越大。最后提出了3种提高结构鲁棒性的有效方法：减小结构中构件的重要性系数、减小构件易损性系数以及降低结构重要构件和易损构件的重合率。分析表明在体系柱中加支撑是提高含格构化体系柱RC框架鲁棒性的有效途径。

ROBUSTNESS ANALYSIS OF RC FRAME WITH LATTICED-FRAME COLUMN

To investigate the robustness behavior of RC frame with latticed-frame column,a quantificational method of member vulnerability coefficient based on resistance utilization rate is proposed and the calculation of structural robustness coefficient is improved in this paper. Four RC frames with different latticed-frame columns are analyzed and compared, which considered the member importance coefficient, member vulnerability coefficient and structural robustness coefficient. Analysis indicates that that braces can reduce both the member importance coefficient and vulnerability coefficient, leading to improvement of structural robustness. The robustness coefficient can be influenced by the strength of braces, when the brace is a vulnerable member. A stronger brace leads to a more robust structure. Finally, three effective methods to improve the structural robustness are proposed: reducing the member importance coefficient, reducing the member vulnerable coefficient, and reducing the coincidence rate of the important members and the vulnerable members. It is concluded that it is an effect way to improve the robustness of RC frame with latticed-frame column by adding braces into latticed-frame column.