北京新机场装配式单层铝合金网壳结构整体稳定性能研究

以北京新机场装配式单层铝合金网壳结构作为研究对象，建立了其装配式节点——板式节点及考虑节点性能的单层铝合金网壳的有限元模型，分析了板式节点的力学性能及节点性能对单层铝合金网壳稳定性能的影响。研究表明：板式节点刚度良好，破坏表现为不锈钢拉铆钉剪切破坏、连接板拉剪破坏和杆件在螺栓孔处承压破坏；北京新机场装配式单层铝合金网壳结构的整体稳定性能良好，承载力约为刚接网壳结构的90%，满足JGJ 7—2010《空间网格结构技术规程》的要求；由于铝合金材料无明显的屈服台阶，弹性模量较小，考虑几何非线性和材料非线性的稳定承载力比仅考虑几何非线性的稳定承载力降低约30%，结构发生弹塑性失稳，结构失稳形态表现为网壳结构在靠近长轴右端出现凹陷。

Stability analysis of single-layer aluminium alloy reticulatedshells with Temcor joints at Beijing New Airport

Taking the single-layer aluminium alloy reticulated shells at Beijing New Airport as research object, the finite element models were developed to evaluate the effect of the mechanical behavior of the Temcor joint on the stability of single-layer aluminium alloy reticulated shells. The study shows that the stiffness of the Temcor joint is good. The failure mode of the Temcor joint is characterized by the shear fracture of the stainless steel rivet, combined shear and tensile failure of gusset plate and the bearing failure around the bolt holes. The overall stability of the single-layer aluminium alloy reticulated shells is good. The buckling load of the reticulated shell with Temcor joints is approximately 90% of that of the reticulated shell with rigid joints, which can meet the requirements of the JGJ 7—2010 ‘Technical specification for space frame structures’. Because of the small elastic modulus and no obvious yield plateau of the aluminium alloy, the predicted buckling load considering the geometric and material nonlinear is 30% lower than that only considering the geometric nonlinear. The single-layer aluminium alloy reticulated shell shows a elastoplastic buckling with the buckling mode of collapse near the right side of the long axis.