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某体育馆屋盖结构采用阶梯式椭圆抛物面网壳,网壳形式为双层凯威特式。通过静力计算发现,网壳的受力状态有其自身的特点:上层网壳的下弦与下层网壳的上弦位于连续的同一壳面,力的传递是从作为下弦杆件受拉到作为上弦杆件受压的渐变过程。通过线性和非线性屈曲分析,对网壳结构的整体稳定性能进行研究。网壳结构在到达临界点前,已经有部分杆件进入塑性,但网壳结构仍然有继续承载的能力。网壳结构的弹塑性失稳过程从网壳长跨方向在结构前部的两处变阶位置的搭接节间弦杆开始。这些杆件的屈服导致其丧失承载进一步荷载增量的能力,造成相应节点发生内陷,进而导致整个结构发生失稳。
A gymnasium roof structure using stepped elliptic parabolic reticulated shell, net shell form double Kaiweite. Through the static calculation, it is found that the state of the reticulated shell has its own characteristics: the lower chord of the upper reticulated shell and the upper reticulated shell of the lower reticulated shell are located on the same continuous shell surface, and the force is transmitted from the lower chord member to the upper chord Gradual compression of the rod process. Through the linear and nonlinear buckling analysis, the overall stability of the reticulated shell structure is studied. Before the reticulated shell structure reaches the critical point, some of the rods have already entered the plasticity, but the reticulated shell structure still has the ability to continue bearing. The elasto-plastic instability of the reticulated shell begins with the lapped in-chord chords at two different positions in the front of the structure extending from the reticulated shell. The yield of these rods results in their loss of capacity to carry further load increases, causing the corresponding nodes to collapse, which in turn causes the entire structure to buckle.