新型钢桁架连梁的抗震性能试验研究

通过对8个钢组合桁架连梁的伪静力试验，初步了解了组合连梁的破坏特点、抗剪承载力、变形能力、滞回曲线、骨架曲线、延性、耗能、刚度退化以及适宜采用的桁架形式等。试验结果表明：在地震作用下，设交叉腹杆桁架比无交叉腹杆的桁架连梁有更大的抗剪承载力、更好的延性和耗能能力；较小跨高比、较大刚度的试件表现出在承载能力方面具有相对优势；试验连梁试件根部节点采用预埋钢板或弦杆直接埋入这两种设计方案均可行，便于施工维修。钢桁架连梁具有抗震所需的高延性和良好塑性耗能能力

Test for aseismic behavior of new steel truss coupling beams

Based on pseudo-static tests of 8 small span-depth ratio steel truss coupling beams,the composite coupling beams’ failure characteristics,shear-bearing capacity,deformation capacity,hysteretic curve,skeleton curve,ductility,energy dissipation,rigidity decline and reasonable truss style were analyzed.The test results showed that the steel beams with cross abdominal trusses have bigger shear-bearing capacity and better ductility and energy dissipation capability than those of the beams without cross abdominal trusses;a better bearing capacity can be obtained when span-to-depth ratio is smaller and stiffness is bigger;the two design schemes of pre-buried steel plates and buried steel chord members in concrete for the beams’ ends are available and convenient to construct and maintain.So,the steel truss coupling beams had fairly good ductility and plastic energy-dissipation capability for anti-earthquake.