后加交叉钢支撑对RC框架结构的影响研究  

Study on the Effect of Crossed Steel Bracing on RC Frames

作　　者：吴永河[1] 李胜强[1] 习会峰[1] 穆建春[1] 

机构地区：[1]广东石油化工学院建筑工程学院,茂名525000

出　　处：《结构工程师》2011年第4期50-57,共8页Structural Engineers

摘　　要：为揭示后加交叉钢支撑对RC框架结构的影响规律,考虑结构层数、支撑截面尺寸及支撑与框架结构的连接方式三种影响因素,采用ETABS建立结构模型,对加钢支撑后RC框架结构的周期、刚度及基础反力及梁柱内力进行了定量分析。结果表明,后加交叉钢支撑对不同结构层数的RC框架的影响规律基本相同,支撑截面尺寸对支撑所在的结构单元的构件内力有较大影响,支撑与框架结构刚接或铰接连接的计算结果基本相同。此外,后加钢支撑承担了大部分的水平剪力,钢支撑对重力荷载或地震作用下的基础反力、地震作用下的柱轴力、梁弯矩及剪力,以及重力荷载作用下的梁轴力均有较大的影响。In order to discover the law of effect of crossed steel bracing on RC frames,three affecting factors such as structural layers,bracing cross-section dimension and connection method of bracing and frames were taken into account,and ETABS was used to establish structure models so as to conduct quantitative analysis of period,stiffness,foundation reaction and internal forces of beams columns in RC frames provided with steel bracing.The result shows that,the effect laws of crossed steel bracing on RC frames of different structural layers are basically the same,the effect of bracing cross-section dimension on internal forces of members of structural units where bracing are located is great,and the calculation results of rigid or hinged connection of bracing and frames are basically the same.In addition,the steel bracing provided later bears most of the horizontal shearing force,and greatly affects foundation reactions due to gravity load or earthquake,column axial forces and beam bending moments and shearing forces due to earthquake,and beam axial forces due to gravity load.

关 键 词：中心钢支撑 周期 刚度 基础反力 内力 

分 类 号：TU323.5[建筑科学—结构工程]