不规则框架结构抗震加固措施与加固方案研究

Study on Seismic Reinforcement Measures and Schemes of Irregular Frame Structures

以天津市某既有平面不规则框架建筑为研究对象,运用SAP2000有限元分析软件对原结构建模并进行弹塑性时程分析,依据分析结果及该工程自身特点,提出了BRB支撑减震抗扭加固方案;将BRB支撑结构与原结构在不同地震波作用下的抗震加固效果进行比较,BRB支撑结构的周期比减小了26%,扭转位移比减小了15%,层间位移角减小幅度可达31%,顶层最大位移也可以控制在规范要求的范围内。研究结果表明,BRB支撑不仅增加了结构的抗侧移刚度,而且提高了结构的抗震性能,是一种控制不规则结构扭转效应的有效措施。

In this paper, the SAP2000 finite element analysis software was applied to model the original frame of an existing irregular plane framework in Tianjin and the elastic-plastic time-history was analyzed. The BRB damping and anti-torsional reinforcement scheme was proposed based on the analysis results and the characteristics of the project. Compared with the original frame, the period ratio of BRB frame was reduced by 26 %, torsional displacement ratio was decreased by 15%;decreasing of inter-story displacement angle could reach 31% and the maximum displacement angle of the top layer could be controlled within the scope of the code. The results indicate that BRB not only increases the anti-lateral stiffness of the structure, but also improves the seismic performance of the structure, which is an effective approach to control torsional effect of irregular structures.