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平面钢框架结构二阶弹塑性分析 总被引:2,自引:0,他引:2
采用有限变形理论及内力屈服面塑性流动理论对平面钢框架进行了弹塑性大变形全过程分析.该方法导出了既考虑几何非线性又考虑材料非线性新的弹塑性刚度矩阵,并且考虑了剪切变形的影响,对求解弹塑性稳定极限承载力,确定结构的薄弱部位,精度较高,计算量较小. 相似文献
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结合殷家岩隧道施工,对隧道围岩进行了位移反分析,得到了围岩松动区的弹性模量;应用反分析结果进行数值模拟,预测后续施工步的位移和应力;同时,将预测结果与现场观测进行比较,检验反分析结果。结果表明,利用反分析得到的围岩参数预测后续施工步的位移与现场观测结果比较吻合。 相似文献
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研究了结构安定分析的上、下限定理及变荷载区域,推导了与上、下限定理相对应的线性规划格式,在比较两个线性规划格式的基础上,得出当剩余变量为非基变量时由下限定理求出的安定因子即为结构安定性的完全解的结论,文末给出了算例。 相似文献
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Experiments and numerical simulations have been carried out to study residual stress of copper specimens by the identation
method with a flat cylindrical indenter. Copper specimens were annealed at different temperatures for 35 min to obtain different
residual stress levels. The experiments carried out on these specimens demonstrated the influence of residual stress on indentation
behavior. The influence of annealing temperature on the elastic-plastic transition region is quite obvious. A method has been
presented to determine material properties, such as elastic modulus and Poisson ratio. This method can also be applied to
determine residual stress with the assumption of knowing the yield stress in advance. The advantage of this method is that
it can avoid calculating the contact area. In the finite element modeling (FEM), residual stresses on copper specimens are
simulated by preapplying stresses. The influence of residual stress on the indentation load-depth curves has been studied
by FEM. There is good agreement between experimental and FEM numerical results. A numerical method has also been presented
to determine residual stress. In addition, Mises stress and plastic distribution ahead of the indenter have also been studied
to help us further understand the influence of residual stress. 相似文献
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为研究大跨空间展览馆在多点地震激励下的弹塑性反应和抗震性能,利用SAP2000软件建立结构的有限元模型,采用TJU.SAP2ABAQUS接口程序转化为相应的ABAQUS模型,经模态分析验证了转化前后模型的一致性.分别考虑单向和三向地震输入,对该结构进行了地震一致和多点激励下的动力弹塑性分析.结果表明:单向多点地震激励下,柱底内力、剪力墙应力以及结构顶部位移均较一致激励时增大;三向多点激励下,结构柱底内力和剪力墙的应力较单向多点激励时有增有减,结构顶部位移增大;多点激励对结构两侧柱底内力的影响显著,对中部柱底内力的影响较小. 相似文献
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对两端固定的工字钢短柱的温度应力进行试验研究,给出的温度应力估算公式与试验结果符合性较好。研究结果表明:火灾中钢构件内力分析时,可把构件视为理想的弹塑性体;在弹性阶段,温度应力的增加只与温度相关,但初始应力的大小决定构件进入弹塑性阶段的温度(或时间);从构件进入弹塑性后期到莱一截面形成塑性铰可经历较长的时间,为超静定钢结构在火灾条件下利用内力重分布提供了较大空间。 相似文献