多遇地震作用下钢支撑对RC框架结构的影响研究

Study on Effect of Steel Brace on RC Frames in Frequently Occurred Earthquake

为揭示钢支撑对RC框架结构的影响规律,在4、8、12层RC框架结构上后加V型、对角型、X型及大型四种钢支撑,通过ETABS建立结构模型并进行多遇地震作用下的分析。结果表明,钢支撑改变了原结构的变形特性,使结构的刚度、楼层剪力及边柱轴力增大,中柱轴力降低。此外,钢支撑作为主要的抗侧力构件,承担了大部分地震作用,改变了原结构的传力路径,使梁端弯矩降低、梁轴力增大,与支撑相连的基础反力也相应增大。

For the purpose of revealing the effect rule of steel brace on RC frames, four shapes of steel brace,i.e. V-shape, diagotml-shape ,X-shape and large one, are applied in RC flames on the 4F, 8F and 12F respectively to build structural model and conduct effect analysis under frequently occurred earthquake circumstance through ETABS. The results show that the steel brace changes the deformation characteristics of the original structure, increas- es its rigidity,storey shear force and shaft force of the side pillar and decreases shaft force of the center pillar. Furthermore, as a major lateral resisting element, the steel braze changes the force-transferring path of the original structure ,lowers the bending moment of beam end and increases beam＇s shaft force, thus foundation reaction connecting with brace increases accordingly.