矩形钢管混凝土柱单向压弯承载力计算方法对比研究  

A Comparative Study on the Calculation Methods of the Bearing Capacity of Concrete-Filled Rectangular Steel Tubular Columns Under Uniaxial Bending and Compression

作　　者：付波 程志书 贾树华 孙浩 童根树[2] FU Bo;CHENG Zhishu;JIA Shuhua;SUN Hao;TONG Genshu(TongMSK Hangzhou Steel Structure Design Co.,Ltd.,Hangzhou 311215,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]杭州铁木辛柯建筑结构设计事务所有限公司,杭州311215 [2]浙江大学建筑工程学院,杭州310058

出　　处：《建筑钢结构进展》2022年第5期27-39,72,共14页Progress in Steel Building Structures

基　　金：国家重点研发计划项目(2016YFC0701201)。

摘　　要：现行设计规范针对矩形钢管混凝土柱承载力提供了3种不同的计算方法,在实践中发现各种计算方法之间存在一定程度的偏差。分别使用3本规范提供的承载力计算方法并结合试验数据,对不同高宽比截面和套箍系数的矩形钢管混凝土柱的轴压强度承载力、轴压稳定承载力、强弱轴抗弯承载力以及强弱轴单向压弯承载力进行对比分析。对比结果表明:当截面高宽比大于2.0时,《钢管混凝土结构技术规范》(GB 50936—2014)得到的弱轴面内压弯承载力与试验值偏差较大;《矩形钢管混凝土结构技术规程》(CECS 159:2004)在构件长细比大于50时,弱轴面内压弯承载力计算值与试验值相比偏不安全;《组合结构设计规范》(JGJ 138—2016)在计算强轴压弯承载力时偏于保守。采用结构稳定理论重新推导出了新的矩形钢管混凝土柱单向压弯承载力计算公式。最后对3本规范公式的适用范围给出了建议,可为设计人员在实际工程中选择合适的规范提供参考。At present,three standards have large differences in the design equations of the bearing capacity of concrete-filled rectangular steel tubular columns.In this paper,by using bearing capacity calculation methods in three standards respectively,and combining with experimental data,the bearing capacity in compression,buckling capacity,pure bending,and combined compression-bending with sections of different aspect ratios and confinement coefficients are analyzed comparatively.The comparison results show that when the section aspect ratio is larger than 2.0,the weak axis in-plane compression and bending bearing capacities obtained by Technical Code for Concrete Filled Steel Tubular Structures(GB 50936—2014)have a large difference from the test results.When the slender ratio is larger than 50,the calculated results of in-plane weak axis flexuralcompressive capacity obtained by Technical Specification for Structures with Concrete-Filled Rectangular Steel Tubular Members(CECS 159:2004)are unsafe compared with the test results.The formulas of Code for Design of Composite Structures(JGJ 138—2016)are too conservative when calculating the strong axis flexural-compressive capacities.A new calculation formula for unidirectional compressive and flexural bearing capacity of rectangular concrete-filled steel tubular columns is developed by using the structural stability theory.The accuracy and applicability of design formulas in three standards are discussed,which provides a reference for designers in real projects.

关 键 词：矩形钢管混凝土柱 承载力 轴压 纯弯 压弯 

分 类 号：TU398[建筑科学—结构工程]