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根据单根加载试验情况,建立扣件式钢管模板支撑体系有限元模型,试验结果与有限元分析结果吻合较好,验证该有限元模型的正确性。进一步分析了剪刀撑布置方式与顶层增设水平拉杆对架体整体稳定性的影响。研究表明:加入竖向剪刀撑比加入水平剪刀撑,支撑体系的屈曲荷载提高了78.7%;同时加入竖向剪刀撑和水平剪刀撑比只加入竖向剪刀撑,支撑体系的屈曲荷载提高了0.93%;设置竖向剪刀撑可显著提高支撑体系屈曲荷载;设置水平剪刀撑对提高支撑体系屈曲荷载作用不明显。在顶层步距两水平拉杆中间增设一道水平拉杆,支撑体系的屈曲荷载可得到有效提高。
According to the single-loading test, the finite element model of the fastener-supported steel pipe formwork support system is established. The experimental results are in good agreement with the finite element analysis. The correctness of the finite element model is verified. The influence of scaffolding arrangement mode and the additional horizontal tie bar on the overall stability of the frame was analyzed. The results show that the buckling load of the support system increases by 78.7% when adding the vertical scissor support to the horizontal scissor support, and the vertical buckle support and the vertical scissor support only increase the buckling load of the support system by 0.93 %; Setting vertical scissors bracing can significantly improve the buckling load of the supporting system; setting the horizontal scissor bracing does not obviously improve the buckling load of bracing system. In the top step between two horizontal tie rod to add a horizontal tie rod, the buckling load of the support system can be effectively improved.