外包钢板-高延性混凝土组合连梁抗震性能试验研究

EXPERIMENTAL RESEARCH ON ASEISMIC BEHAVIOR OF HIGH DUCTILE CONCRETE FILLED STEEL PLATE COMPOSITE COUPLING BEAMS

为改善小跨高比连梁的抗震性能,采用高延性混凝土(HDC)代替混凝土,设计了2个外包钢板-HDC组合连梁、1个外包钢板-混凝土组合连梁和1个内置钢板-HDC组合连梁试件。通过拟静力试验,研究其破坏形态、变形能力及耗能能力。试验结果表明:采用HDC代替混凝土可提高外包钢板组合连梁的变形能力和耐损伤能力;HDC与钢腹板的协同工作性能较好,有利于钢腹板抗剪作用的发挥;外包钢板-HDC组合连梁的耗能能力明显高于外包钢板-混凝土组合连梁和内置钢板组合连梁;外包钢板-HDC组合连梁的剪压比设计值为0.65～0.70,其剪压比明显高于内置钢板组合连梁。因此,采用外包钢板-HDC组合连梁,可提高小跨高比连梁的剪压比限值,解决连梁设计中剪压比超限的问题。

To improve the aseismic behavior of coupling beams with a small span-to-depth ratio, high ductile concrete(HDC) is used to replace the concrete. Two HDC filled steel plate composite coupling beams, one concrete filled steel plate composite coupling beam and one HDC steel plate composite coupling beam, were designed. The failure pattern, deformation capacity and energy dissipation capacity of composite coupling beams were studied by the quasi-static tests. The experimental results show that the deformability and damage-tolerance of the steel plate composite coupling beams can be improved by replacing concrete with HDC. The synergistic performance of HDC and steel webs is good, which is beneficial to the shear effect of steel webs. The energy dissipation of the HDC filled steel plate composite coupling beams is significantly higher than those of the concrete filled steel plate composite coupling beam and of the HDC steel plate composite coupling beam. The design values of shear-compression ratio of the HDC filled steel plate composite coupling beams is 0.65-0.70,which is obviously higher than that of the HDC steel plate composite coupling beam. Therefore, the shear-compression ratio limitation of the coupling beams can be improved by using the HDC filled steel plate composite coupling beams, and the problem of shear-pressure ratio ultra-limit of coupling beam in design can be solved.