外包钢-混凝土组合梁与钢筋混凝土柱节点的试验研究

Experimental study on joints of outer-plated steel-concrete composite beam and reinforced concrete columns

外包钢-混凝土组合梁是一种新型组合梁,在负弯矩作用下具有良好的工作性能,其与柱连接节点的构造还有待合理设计并试验验证。采用两种不同的构造形式,设计4个外包钢-混凝土组合梁与钢筋混凝土柱的连接节点,并对其进行低周反复荷载作用下的试验研究。对节点的破坏形态、滞回曲线、强度、延性和钢筋、钢板的应变等性能进行分析,结果表明:通过合理的构造措施,外包钢-混凝土组合梁与钢筋混凝土柱的连接节点具有较好的受剪承载力、延性和耗能能力,能够满足工程要求。在此基础上对节点的受力机理进行探讨,提出节点核心区受剪承载力的计算公式,计算结果和试验结果吻合良好。

Outer-plated steel-concrete composite beam is a new type of composite beam, its rational design and experimental verification are needed for the construction of the joints connecting the beam with the columns. For two types of structural forms, four joints connecting the outer-plated steel-concrete composite beam with reinforced concrete columns are designed and investigated by using low-cyclic load tests. The characteristics of joints, such as failure mode, hysteretic curve, strength, ductility, and strain of steel bars and plates, are analyzed. The experimental results indicate that significant shear-resistant capacity, satisfactory ducti＇lity and energy-dissipation ability can be obtained by appropriate constructional measures. The mechanical mechanism of the joint is further investigated and a formula is presented for calculating the shear capacity of the joint in its core area. The computational solutions agree well with the experimental results.