基于叠加理论的钢管混凝土偏压构件正截面承载力计算  

Calculation of Normal Section Bearing Capacity of Concrete Filled Steel Tube Biased Members Based on Superposition Theory

作　　者：秦鹏[1] 苏苗 QIN Peng;SU Miao(College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《公路工程》2023年第2期143-152,共10页Highway Engineering

基　　金：国家自然科学基金项目(52090082)。

摘　　要：圆截面钢管混凝土在偏心受压下,核心混凝土与钢管两种部件在工作时虽有较好的协同性,但钢材与混凝土的材料属性差异较大,而统一理论是将钢管混凝土作为一种新材料,对于钢管和混凝土两种部件各自的受力状态描述并不明晰。参照钢筋混凝土偏心受压构件正截面承载力的计算方法,合理选择核心混凝土本构,计算等效矩形应力图系数,并基于叠加理论和极限平衡理论,分别对3种不同受力类型下圆截面钢管混凝土偏心受压构件正截面承载力进行理论推导。结合收集到的61组试验结果进行实例验证,并引入我国CECS 28∶2012规程、JCJ01-89规程和Eurocode 4规程与结果进行对比,结果表明公式对钢管混凝土偏压构件承载力的预测效果最佳,为优化钢管混凝土构件的截面设计提供了一定的依据。Round section steel pipe concrete under eccentric compression,the core concrete and steel pipe two components in the work of the better synergy,but the material properties of steel and concrete are different,and the unified theory is the steel pipe concrete as a new material,for the steel pipe and concrete two components of the respective force state description is not clear.With reference to the calculation method of normal section bearing capacity of reinforced concrete eccentric compression members,the core concrete principal structure is reasonably selected,the equivalent rectangular stress diagram coefficient is calculated,and based on superposition theory and ultimate equilibrium theory,theoretical derivation of normal section bearing capacity of steel pipe concrete eccentric compression members with circular section under three different force types is carried out respectively.Combined with 61 sets of test results collected for example verification,the China's CECS 28∶2012 regulation,JCJ01-89 regulation and Eurocode 4 regulation are introduced to compare with the results of this paper,the results show that the formula of this paper has the best prediction effect on the bearing capacity of steel pipe concrete bias members,which provides a certain basis for optimizing the section design of steel pipe concrete members.

关 键 词：钢管混凝土 等效矩形应力图系数 叠加理论 极限平衡 正截面承载力 

分 类 号：TU398.9[建筑科学—结构工程]