钢框架结构抗连续倒塌受力性能分析

发布时间：2018-04-03 03:37

本文选题：钢框架　切入点：连续倒塌　出处：《西安工业大学》2017年硕士论文

【摘要】：随着我国经济的高速发展,对建筑结构也提出了更高的要求,其中钢结构被广泛的应用在大跨度及高层建筑中。结构构件在遭受偶然荷载破坏后,往往会导致结构整体发生倒塌,结构一旦发生倒塌,就会造成极其严重的后果,加之近些年来恐怖袭击频发,公共基础建筑已经成为恐怖袭击的首要目标,所以钢框架结构抗连续倒塌性能分析具有重要的理论意义和工程价值。本文介绍了英美欧三种规范指南,并对其中的荷载组合与判断准则进行对比,结合我国的有关规范,利用SAP2000有限元软件构建了 9层6×5跨钢框架模型,采用备用荷载路径法(简称APM法),分别对空间钢框架结构以及空间钢框架结构中选取的一榀竖向钢框架结构进行静力分析和动力分析,最后将竖向平面钢框架结构和空间钢框架结构分析结果进行对比,得出以下结论:(1)在竖向平面钢框架结构线性静力分析中,去除中柱工况受损跨梁构件首先在底层出现破坏,去除边柱工况受损跨梁构首先在二层出现破坏,且其余梁构件破坏顺序无明显规律。(2)空间钢框架结构和竖向平面钢框架结构在进行静力分析需要考虑动力放大系数α,而动力放大系数α受初始荷载组合大小以及拆除工况的影响。(3)受损跨Pushdown分析中,结合构件塑性铰出现发展顺序,空间钢框架结构发生倒塌首先破坏的构件可以是受损跨的梁构件或柱构件,竖向平面钢框架结构发生倒塌首先破坏的构件是受损跨的梁构件。(4)非线性动力分析使用考虑结构初始状态的等效荷载瞬时加载法,竖向平面钢框架结构大于空间钢框架结构拆除柱子后剩余结构的动力效应。改变瞬时加载时间,竖向平面钢框架结构和空间钢结构的动力效应都会受到影响,且竖向平面钢框架结构受到的影响更大。(5)比较竖向平面钢框架结构和空间钢框架结构的非线性静力分析与非线性动力分析,两种结构在拆除柱子后的内力重分布的路径是相同的,但空间钢框架结构的内力重分布路径更多。
[Abstract]:With the rapid development of economy in our country, higher requirements have been put forward to the building structure, in which steel structure has been widely used in long-span and high-rise buildings.After the structural members are damaged by accidental loads, they often lead to the collapse of the whole structure. Once the structure collapses, it will cause extremely serious consequences. In addition, in recent years, the terrorist attacks occur frequently.Public foundation building has become the primary target of terrorist attack, so the analysis of continuous collapse resistance of steel frame structure has important theoretical significance and engineering value.This paper introduces three kinds of code guides in Anglo-American and European countries, and compares the load combination and judgment criteria among them. Combined with the relevant codes of our country, a 9-story 6 脳 5 span steel frame model is constructed by using SAP2000 finite element software.The static and dynamic analysis of spatial steel frame structure and one vertical steel frame structure selected in space steel frame structure are carried out by the method of standby load path (APM).Finally, the analysis results of vertical plane steel frame structure and spatial steel frame structure are compared, and the following conclusion is drawn: in the linear static analysis of vertical plane steel frame structure, the first failure of the damaged span beam member in the middle column condition occurs at the bottom.The damage to the cross beam structure under the condition of removing the side column is first destroyed on the second floor.Moreover, the failure sequence of other beam members is not obvious. 2) the dynamic magnification factor 伪 is considered in the static analysis of spatial steel frame structure and vertical plane steel frame structure, while the dynamic magnification factor 伪 is subjected to the initial load combination size, and the dynamic magnification factor 伪 is considered in the static analysis of the vertical plane steel frame structure.In Pushdown analysis of damage span,Combined with the development sequence of plastic hinge of the member, the first failure member of the spatial steel frame structure may be the beam member or column member with damaged span.Nonlinear dynamic analysis of beam member with damaged span when the vertical plane steel frame structure collapses first, the equivalent load instantaneous loading method considering the initial state of the structure is used in the nonlinear dynamic analysis.The dynamic effect of vertical plane steel frame structure is greater than that of space steel frame structure after the column is removed.The dynamic effect of vertical plane steel frame structure and space steel structure will be affected by changing the instantaneous loading time.And the vertical plane steel frame structure is more affected than the vertical plane steel frame structure and the spatial steel frame structure, the nonlinear static analysis and the nonlinear dynamic analysis are compared between the vertical plane steel frame structure and the spatial steel frame structure.The internal force redistribution paths of the two structures after removing the columns are the same, but the internal force redistribution paths of the spatial steel frame structures are more than those of the spatial steel frame structures.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391

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