钢管轻集料混凝土组合梁受弯性能的试验研究  

Experimental study on flexural behaviors of composite beam of lightweight aggregate concrete-filled steel tube

作　　者：吉伯海[1] 傅中秋[1] 程苗[1] 徐汉江[1] 董亚东[1] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《中南大学学报（自然科学版）》2013年第1期324-331,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51208176);中国博士后科学基金资助项目(2012M511187)

摘　　要：对钢管轻集料混凝土组合梁进行纯弯试验,研究组合梁破坏形态、协同工作性能、荷载应变关系及抗弯刚度。研究结果表明:开孔钢板作为组合梁的剪力连接件可以保证混凝土板和钢管轻集料混凝土梁的协同工作性能,混凝土板与钢管轻集料混凝土梁的弯曲变形一致,两者相对滑移量小于1.0 mm;组合梁具有较高的抗弯承载能力且位移延性系数大于5.0;钢管对受拉轻集料混凝土具有良好的环向约束作用,在正常使用阶段,保证了组合梁良好的抗弯刚度;在未考虑钢筋混凝土板和钢管轻集料混凝土梁的相对滑移情况下,提出采用组合刚度法对钢管轻集料混凝土组合梁的抗弯刚度进行计算,计算值与试验实测值较吻合。Based on the pure bending test, the failure mode, cooperative effective performance, stress-strain curves and flexural rigidity of lightweight aggregate concrete-filled steel tube composite beam were studied. The results show that the perforated plate as the shear connector of composite beam connects the concrete slab and lightweight aggregate concrete-filled steel tube beam working together well. It has the same bending deformation of the concrete slab and lightweight aggregate concrete-filled steel tube beam, and the relative slip between them is less than 1.0 nun. The composite beam has good bending bearing capacity, and the displacement ductility of specimen exceeds 5.0.The steel tube has excellent constraint effect on lightweight aggregate concrete, which makes the composite beam possesses good flexural rigidity in normal service conditions. The theoretical formula is provided to calculate flexural rigidity without considering relative slip of the concrete slab and concrete filled steel tube. And the calculation results are close to the test values.

关 键 词：钢管轻集料混凝土 组合梁 纯弯试验 剪力连接件 抗弯刚度 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1