装配式交错桁架上弦与柱连接节点静力性能试验研究

Experimental study on static performance of connected joints of top chord of fabricated staggered truss with column

对4个1∶2缩尺、采用外环板-端板形式的装配式交错桁架上弦-方钢管混凝土柱节点试件的静力性能进行了试验研究,包括节点的破坏模式、承载力、刚度、延性和应变反应。试验结果表明,水平单调荷载作用下,节点的竖板、节点板、外环板和柱壁相继屈服进入塑性;各节点试件在破坏前,其承载力均未出现下降,说明该上弦节点具有良好的承载力和安全储备;节点的外环板厚度越大,其弹性刚度越大,且承载力越高;节点偏心距越大,其延性系越好。

The experimental study was conducted on the static performance of four 1∶ 2 scaled joint specimens of top chord of fabricated staggered truss（ composed of the external ring plate and end plate type） with square tubular steel reinforced concrete column. The failure mode,bearing capacity,stiffness,ductility and strain response of joints were studied.Experimental results show that under the effect of horizontal monotonous loads,vertical plate,joint plate,external ring plate and the column wall of the joints yield into plasticity successively; the bearing capacity of each joint specimen is not decreased before failure,showing that the top chord joint has good bearing capacity and safety reserve; the greater the thickness of the external ring plate of the joint is,the greater the elastic stiffness is and the higher the bearing capacity is;the greater the eccentricity of the joint is,the better the ductility of the joint is.