钢筋混凝土结构楼层受剪承载力计算公式系数研究

Research on Calculation Formula Coefficients of Story Shear Capacity for Concrete Structure

钢筋混凝土结构的楼层受剪承载力计算研究目前主要参照《建筑抗震鉴定标准》中的公式。该计算公式没有考虑钢筋混凝土斜撑,也没有充分地考虑各构件的延性差异。本文针对上述两个问题对楼层受剪承载力的计算公式系数进行研究。利用有限元软件对大量各类型抗侧力构件(柱、剪力墙和斜撑)进行静力弹塑性分析,得到相应的荷载-位移角曲线。以此为基础,通过叠加各构件的荷载-位移角曲线,提出包含混凝土柱、剪力墙和斜撑在内的考虑各类构件之间延性差异的新的楼层受剪承载力计算公式。对比验算表明,该公式具有较好精度,可供结构设计参考。

The calculation of story shear capacity of reinforced concrete structure mainly depends on the formula in the standard for seismic appraisal of buildings currently. The calculation formula does not take the reinforced concrete bracing into account and does not adequately consider the difference of member ductility. The research on calculation formula coefficients of story shear capacity for reinforced concrete structure is done to address the problems. A large number of lateral force resisting members are studied with a nonlinear finite element software,and the load-displacement angle curves are obtained by nonlinear static analysis. Based on the curves,through superposition of the load-displacement angle curves of members,a new calculation formula of story shear capacity of reinforced concrete structure is derived,which considers the difference of member ductility,including reinforced concrete columns,shear walls and bracings. The comparison checking shows that the formula has a good accuracy,and can be used for structural design as a reference.