型钢混凝土构件复合受扭性能试验及强度计算  

Combined Torsion Test and Strength Calculation of Steel Reinforced Concrete Members Under Torsion

作　　者：杭子彦 邵永健[1] HANG Ziyan;SHAO Yongjian(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《建筑钢结构进展》2022年第6期65-72,108,共9页Progress in Steel Building Structures

基　　金：2019年江苏省研究生实践创新计划项目(SJCX19_0838);江苏省研究生工作站项目(2010_060)。

摘　　要：为研究双轴对称型钢混凝土构件的复合受扭性能,以配钢形式、箍筋间距、混凝土强度、轴压比、扭弯比为变化参数,完成了10个型钢混凝土试件的单调加载试验。研究了压弯剪扭复合受力下构件的破坏形态、扭率-扭矩曲线,并以叠加原理为基础,探讨双轴对称型钢混凝土构件在扭矩作用下的开裂扭矩和极限扭矩计算。结果表明,试件均经历了开裂荷载前的弹性阶段、弹塑性阶段和峰值扭矩后的破坏阶段;10个试件最终呈扭型破坏;闭合角钢桁架混凝土构件受扭承载力明显优于实腹式十字形型钢混凝土构件;轴压比从0.1增加到0.2,试件受扭承载力平均增长11.5%;扭弯比从0.5增加到1.0,试件受扭承载力平均减小2.3%。根据改进的内力分配法和叠加原理提出的计算公式,其计算值与试验值吻合较好。In order to study the combined torsional behavior of biaxial symmetric steel reinforced concrete members,the monotonic loading tests of ten steel reinforced concrete specimens are carried out with steel form,concrete strength,axial compression ratio,and torsion-bending ratio as variation parameters.The failure mode and torsion-torque curve of the members under the combined torsion are studied.Based on the superposition principle,the calculation of the cracking torque and ultimate torque of biaxially symmetrical steel reinforced concrete members are discussed.The results show that all the members have experienced the elastic stage before the cracking load,the elastic-plastic stage,and the failure stage after the peak torque.The ten specimens eventually failed in torsion mode.The torsional load capacity of closed-angle steel truss concrete members is significantly better than that of solid cross-section concrete members.When the axial compression ratio increases from 0.1 to 0.2,the torsional capacity of the specimens increases by an average of 11.5%.When the torsion-bending ratio increases from 0.5 to 1.0,the torsional capacity of the specimens decreases by 2.3%on average.The calculation formula is based on the improved internal force distribution method and the superposition principle,whose calculated results agree well with the test results.

关 键 词：双轴对称 型钢混凝土 复合受扭 开裂扭矩 极限扭矩 

分 类 号：TU398.9[建筑科学—结构工程]