改进组合式T形钢管内核心混凝土应力-应变关系  

Stress-strain relationship for core concrete of improved composite T-shaped steel tube

作　　者：曹兵[1] 戴绍斌[2] 黄俊[2] 陶李[1] 

机构地区：[1]安徽工程大学建筑工程学院,安徽芜湖241000 [2]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《合肥工业大学学报（自然科学版）》2017年第4期515-521,共7页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省自然科学基金资助项目(1708085QE121);安徽省高等教育提升计划资助项目(TSKJ2016B25);安徽工程大学科研启动基金资助项目(2015YQQ013);安徽省大学生创新创业训练计划资助项目(201610363116)

摘　　要：文章基于改进组合式T形钢管混凝土柱轴压试验结果,详细分析了在轴压状态下钢管对核心混凝土的约束特点,通过截面合理划分和假定,并借鉴已有的箍筋约束混凝土应力-应变关系,提出了改进组合式T形钢管内核心混凝土应力-应变关系;在分析主要影响参数的基础上,给出了应力-应变关系参数计算表达式;采用有限元软件ABAQUS对改进组合式T形钢管混凝土柱轴压荷载-应变关系曲线进行了数值计算,并将有限元计算结果与试验结果进行对比。研究结果表明,有限元计算结果与试验结果吻合较好,验证了所提核心混凝土应力-应变关系的合理性。Based on the axial compressive experimental results of improved composite T-shaped con- crete-filled steel tubular columns, the constraint characteristic of steel tube to core concrete under axi- al compressive load was analyzed. According to the existing stress-strain relationship for stirrup con- fined concrete, the stress-strain relationship for the core concrete of improved composite T-shaped steel tube was proposed by reasonable section division and assumption. Based on the analysis of the key influencing parameters, the parameter calculation expressions of stress-strain relationship were given. Then the load-strain curves of the improved composite T-shaped concrete-filled steel tubular columns were analyzed with the proposed stress-strain relationship by using finite element software ABAQUS, where the results calculated by ABAQUS were compared with the experimental results. It is shown that the results calculated by ABAQUS agree well with the experimental results, thus verif- ying the rationality of the proposed stress-strain relationship.

关 键 词：组合式T形钢管 核心混凝土 约束特点 应力-应变关系 有限元 

分 类 号：TU398.9[建筑科学—结构工程]