钢网格盒式结构空腹桁架与柱弱轴相交节点抗震性能试验研究

Experimental Study on the Seismic Behavior of Intersection Joints of Vierendeel Truss with Column in Weak-Axis in Steel Grid Cassette Structures

为了研究钢网格盒式结构体系空腹桁架与柱弱轴相交节点的抗震性能,设计制作了2个边柱纯钢节点和1个带混凝土板的边柱组合节点,进行低周反复荷载试验,比较和分析节点的试验现象、破坏模式、承载力、滞回曲线、延性和耗能性能等指标,并利用ABAQUS进行详细计算和对比分析,并在此基础上对采用不同构造措施的节点试件进行有限元模拟分析。结果表明:钢网格盒式结构体系空腹桁架与柱弱轴相交的纯钢节点和组合节点具有良好的抗震性能,上、下弦间加劲肋有助于提高节点的延性和耗能能力,相对于方形加劲肋,圆弧形加劲肋节点的承载力和延性更加优越,组合节点由于混凝土层的抗压和钢筋的抗拉作用,其承载力和耗能性能均有一定程度的提高。

In order to study the seismic resistance of intersection joints of vierendeel truss with column in weak-axis in steel grid cassette structures,two composite side column joints and one bare steel side column joint are conducted.The experimental observations,failure process,load bearing capacity,hysteretic curve,ductility,and energy dissipation are investigated and analyzed.ABAQUS is used to calculate and compare with the test results,as well as to simulate the joints with different construction details.Results show the composite joint and bare steel joint of vierendeel truss with column in weak-axis in steel grid cassette structures have good seismic resistance.The stiffening ribs in the upper and lower chords are helpful to improve the ductility and energy dissipation capacity of the joint.The circular arc form stiffener rib has better bearing capacity and ductility with the same width.The loading bearing capacity and energy dissipation of composite joints are improved because of the compression action of concrete slab and tension action of steel bar.