铝合金板式节点平面外受弯滞回性能试验研究

为研究节点板厚度、节点板材质、是否设置抗剪键以及加载模式对铝合金板式节点滞回性能的影响，完成了4组共计8个试件平面外受弯的拟静力试验，对其变形特征、破坏模式、承载能力、延性以及耗能能力等进行了分析。结果表明：板式节点在平面外往复弯矩作用下的受力过程可以分为5个阶段，即弹性阶段、螺栓滑移阶段、孔壁承压阶段、承载力退化阶段和破坏阶段；通过破坏后试件的形态特征可归纳出节点的两种破坏模式分别为杆件破坏和节点板块状拉剪破坏，且破坏模式与节点板厚度和杆件翼缘厚度密切相关；由于螺栓滑移的影响，节点的滞回曲线不够饱满；综合对比试件的骨架曲线、位移延性系数和能量耗散系数，节点板较厚的铝合金板式节点具有更好的承载能力、变形能力和耗能能力。

Experimental study on hysteretic behavior of aluminum alloy gusset joint under out-of-plane bending

Considering the influence of gusset thickness, gusset material, shear connector and loading scheme, quasi-static experiments of eight aluminum alloy gusset joints (AAG joints) under out-of-plane bending moment were carried out. The deformation characteristics, failure modes, bearing capacity, ductility and energy dissipation of AAG joints were obtained. The experimental results reveal that the behavior during the loading process can be divided into five stages: elastic stage, bolts slipping stage, bolt hole bearing stage, bearing capacity degradation stage and failure stage. The failure modes mainly include buckling of members and block shear rupture of gusset plates, which are related to the thickness of plate and the flange of member. The hysteresis of the AAG joint specimens are not very full due to the influence of bolts slipping. Comprehensively considering the skeleton curve, deformation ductility coefficient and energy dissipation coefficient of specimens, the AAG joint with thicker plate can provide relatively better bearing capacity, ductility and energy dissipation.