钢管混凝土组合柱压弯性能试验及承载力计算  

STRENGTH CALCULATION AND ECCENTRIC COMPRESSIVE TEST OF STEEL TUBE-REINFORCED CONCRETE COMPOSITE COLUMNS

作　　者：柯晓军[1,2] 苏益声 商效瑀[3] 孙海洋 KE Xiao-jun;SU Yi-sheng;SHANG Xiao-yu;SUN Hai-yang(Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Guangxi University,Nanning 530004,China;School of Civil Engineering and Architecture,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]广西大学土木建筑工程学院工程防灾与结构安全教育部重点实验室,南宁530004 [2]广西防灾减灾与工程安全重点实验室,南宁530004 [3]东北电力大学建筑工程学院,吉林132012

出　　处：《工程力学》2018年第12期134-142,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51508112;51668007;51468003);广西自然科学基金项目(2015GXNSFBA139210);广西重点实验室系统性研究项目(2016ZDX02)

摘　　要：现行叠合柱规程CECS188∶2005计算钢管混凝土组合柱压弯承载力时,不计钢管作用影响,构件承载能力未充分利用。为此,该文通过钢管混凝土组合柱偏心受压试验,考察破坏形态及约束机理,完善压弯承载力计算理论。研究表明:钢管混凝土组合柱发生大、小偏心受压破坏,以受拉区纵筋达到屈服强度,同时混凝土受压边缘达到极限压应变为界限破坏准则;截面应变符合平截面假定,其中钢管横向应变随着偏心距减小而增大,即钢管约束作用增强,倾向于轴心受压构件而不可忽略;最后提出能够考虑钢管及其约束作用的正截面压弯承载力计算公式,通过40组试验样本的验证表明,该方法计算合理可靠,可用于指导设计。According to Technical Specification for Steel Tube-Reinforced Concrete Column Structure, the compression-bending capacity of a steel tube-reinforced concrete composite column without considering the steel tube is not fully utilized. Therefore, the failure pattern and confinement mechanism through eccentric compressive test was performed to complement the existing calculation theory in this paper. The test results show that failure patterns of all specimens are divided into two types, namely the large and the small eccentric failures, whose demarcation failure criterion is that the tensile reinforcements reach the yield strength and the concrete compressive edge reaches the ultimate compressive strain. Furthermore, the cross-section strain obeys the plane section assumption, and the transverse strain of steel tube increases with the decreasing of eccentricity, which fails to yield at the peak loading and is not negligible. Finally, a formula is proposed to calculate the compression-bearing capacity considering the influence of steel tube and its restraining action. Based on 40 groups of test data from this paper and other references, this calculated formula proves to be reasonable, and can be used to guide the design for steel tube-reinforced concrete composite column.

关 键 词：钢管混凝土 组合柱 偏心受压 压弯性能 承载力计算 

分 类 号：TU398.9[建筑科学—结构工程]