考虑初始缺陷的扣件式钢管模板支架极限承载力研究

Study on ultimate bearing capacity of fastener-style tubular steel falsework with initial imperfection

以扣件式钢管模板支架整体稳定性试验模型为计算模型,结合材性试验和节点半刚性试验,在有限元软件ANSYS中建立了具有材料多线性随动强化和节点半刚性的整架模型.以实测缺陷为依据,对架体进行一致缺陷模态法和随机缺陷模态法的缺陷非线性稳定分析,结果证明了该有限元模型的正确性和一致缺陷模态法在分析扣件式钢管模板支架结构时的可行性,并指出扣件式钢管模板支架结构应属于缺陷敏感结构.通过对结构试验、一致缺陷模态法和随机缺陷模态法计算的结构失稳模态和荷载位移曲线的对比研究,验证了扣件式钢管模板支架结构的脆性失稳破坏特征,并得出了一些有意义的结论.

A FEM with material multilinear kinematic hardening and node semi-rigid was established in ANSYS simulate test model of fastener-style tubular steel falsework based on material characteristic and node semi-rigid experimentation.Based on the data of measured imperfection,both the consistent mode imperfection method and stochastic imperfection method were employed to analyze the stability of the imperfection model.The result proved the model＇s correctness and consistent mode imperfection method＇s feasibility.In analyzing the fastener-style tubular steel falsework,the paper points out that fastener-style tubular steel falsework should belong to imperfection-sensitive structure.The brittleness failure characteristic of fastener-style tubular steel falsework proved to be valid and several significan conclusion are deluced after the deformation mode and load-displacement curve of the test were analyzed consistent mode imperfection method and stochastic imperfection method all proved to be valid.