原创《雪灾下轻钢结构大面积破坏概率成因》：这是一篇与轻钢结构论文范文相关的免费优秀学术论文范文资料,为你的论文写作提供参考。
作者简介：蒋友宝(1982),男,副教授,博士,从事复杂结构分析和结构可靠度研究,(Email)jiangybseu@163.com.摘 要：现行可靠度设计统一标准在分析轻钢结构构件可靠度时,对荷载效应比值的取值范围考虑不够充分.针对此不足,提出了1种基于应力的荷载效应比值计算方法,解决了在构件失效是由多种形式内力引发的情形下选择何种荷载效应来计算荷载效应比值的问题.以多个轻钢结构构件为例,采用该方法分析了轻钢结构中荷载效应比值的取值范围.揭示了雪荷载不利布置下,轻钢结构的荷载效应比值将会非常高的现象.接着对按现行分项系数设计的轻钢结构进行了可靠度校核,表明轻钢结构的可靠性处于较低的水平.最后分析了雪荷载超过设计标准时轻钢结构可靠度随不同荷载效应比值的变化规律.结果表明当雪荷载超载较大时,荷载效应比值越大的结构可靠性越低.这从可靠性的角度为近年雪灾中轻钢结构大面积破坏的现象提供了补充解释.
关键词：轻钢结构；雪荷载；可靠度；分项系数；荷载效应比值
中图分类号：TU391文献标志码：A文章编号：16744764（2012）03006505
Probability Analysis of Failure Cause for LightWeight
Steel Structure under Snow Disaster
JIANG Youbao
(College of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410004, China)
Abstract:In the current unified standard for reliability design, it lacks full considerations of the range of load effect ratio for reliability analysis of lightweight steel structures. Firstly, a computational method based on stress was proposed to calculate load effect ratio, which solves the problem that which kind of load effects can be chosen to calculate load effect ratio when the member fails with actions of several kinds of internal forces. Then, the range of load effect ratio was studied for lightweight steel structures after some analyses of several members with this method. It is found that the load effect ratio of lightweight steel structures can adopt large values under the disadvantage distributions of snow load. The reliability was also calculated for lightweight steel structures designed with current partial factors. Its result shows that the reliability of lightweight steel structure is low. Finally, the reliability was analyzed for lightweight steel structures with different load effect ratios when snow load exceeded the design standard level. It indicates that the reliability is low for lightweight steel structures with large load effect ratio. This provides some complementary explanations for the phenomena that the light steel structures are more likely to fail under snow disaster.
Key words:lightweight steel structure; snow load; reliability; partial factor; load effect ratio
轻钢结构具有自重轻、施工速度快、综合造价低等优点,在建筑结构领域已得到了较广泛应用［1］,针对该类结构的优化设计也有较多研究［23］.然而这种结构的抗超载性能较差,在大雪灾害中较容易破坏,如图1所示.
针对轻钢结构的这种不足,目前已有较多对该结构进行事故分析和反思的研究［45］,并提出了一些改进的措施来提升其抗超载性能,如加强支撑的布置、不宜过分优化设计等,这些改进措施在一定程度上能获得较好的效果.但需指出的是,由于目前对轻钢结构的可靠度分析并非详尽,使得如何把握优化设计的“度”存在一定困难,因此提升轻钢结构抗超载性能仍不够完善,需进一步研究.
针对多个轻钢结构典型实例分析了其荷载效应比值的特性,校核了轻钢结构的设计可靠度,在此基础上研究了不同荷载效应比值下轻钢结构的抗超载性能.〖等于D(〗蒋友宝：雪灾下轻钢结构大面积破坏的概率成因〖等于〗
轻钢结构论文参考资料：
结论：雪灾下轻钢结构大面积破坏概率成因为关于本文可作为相关专业轻钢结构论文写作研究的大学硕士与本科毕业论文钢结构别墅200平造价论文开题报告范文和职称论文参考文献资料。
