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为研究既有门式刚架轻钢厂房结构的抗风性能和极限承载力,以我国东南沿海某轻钢厂房为背景,采用精细板壳单元和面外杆件单元建立三维整体有限元模型,分别按中国和美国相关规范的荷载组合施加风荷载,对厂房结构进行了弹塑性和大变形的非线性极限承载力分析,获得了承重结构的抗风安全冗余度系数以及达到极限状态时的破坏模式。结果显示,刚架按国内规范的风荷载作用下的安全冗余度大于美国规范的相应值;两者的破坏模式均为刚架的局部屈曲模式,但前者的局部屈曲集中于单榀刚架近屋脊梁段与迎风梁柱节点的多个区域中,而后者则发生于多榀刚架的同一梁柱节点处,呈现出空间化的分布特征,且发生时间早于前者。
In order to study the wind resistance and ultimate bearing capacity of the existing light-weight rigid-frame steel plant structure, a three-dimensional overall finite element model is established by using a thin plate shell element and an out-of-plane rod element with the light steel plant in the southeast coast of China as the background. The wind load was applied according to the load combination of China and the United States, respectively. The nonlinear ultimate bearing capacity of the plant structure under elastic-plastic deformation and large deformation was analyzed. The wind-safety redundancy coefficient of the load- Destruction mode. The results show that the safety redundancy of the rigid frame under the wind load of the national standard is larger than the corresponding value of the US standard. Both of the failure modes are the local buckling mode of the rigid frame, but the local buckling of the former is concentrated on the single 榀 rigid frame Near ridge sections and upwind beam nodes, while the latter occurred at the same beam-column joint of multi-span rigid shelves, showing a spatially distributed feature that occurred earlier than the former.