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针对目前铝合金单层网壳结构中节点形式过于单一的局面,该文首先研发出了一种新型铝合金半刚性节点——柱板式节点。获得了柱板式节点绕强轴、弱轴和扭转三个方向的弯矩-转角曲线,并将其引入到网壳杆件单元模型中,建立了半刚性节点工字型杆件椭圆抛物面网壳的数值分析模型。在此基础上,考虑节点强轴刚度、节点弱轴刚度、节点扭转刚度及跨度和矢跨比等参数影响,对半刚性节点高强铝合金椭圆抛物面单层网壳进行了弹塑性全过程分析,得到了各参数对网壳极限承载力的影响规律,并详细地考察了网壳失稳时的变形形态。研究发现:网壳失稳时,网壳中的柱板式节点均处于弹性状态,说明柱板式节点有较好的刚度,网壳的失稳为伴随杆件扭转屈曲的局部失稳。
In view of the single node form in single-layer reticulated shell of aluminum alloy, a new type of aluminum alloy semi-rigid node-column node has been developed firstly. The moment-rotation curves of the column-shaped joints around the strong axis, the weak axis and the torsional direction were obtained and introduced into the unit cell model of the shell member. The semi-rigid node oval paraboloid reticulated shell Numerical analysis model. Based on this, the full-course elasto-plastic analysis of the elliptic paraboloid single-layer reticulated shell of the high-strength aluminum alloy with semi-rigid joints is carried out considering the parameters of the strong axis stiffness, the weak axis stiffness, the torsional stiffness and span-span ratio, The influence law of each parameter on the ultimate bearing capacity of reticulated shell has been obtained. The deformation of the reticulated shell during its failure is investigated in detail. It is found that the column-plate joints in the shell of the reticulated shell are all in elastic state when the reticulated shell instability, indicating that the column-type joints have better stiffness, and the instability of the reticulated shell is the local buckling with the torsional buckling of the rod.