Evaluation of Load Factor to Be Applied in Buckling Design of Cylindrical Lattice Shells Under Asymmetric Snow Load

IF 1.1 Q3 ENGINEERING, CIVIL

Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-09-01 DOI:10.20898/j.iass.2020.005

S. Kato, Yutaka Niho

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Abstract

The load factor is one of the keys in anti-buckling design for safety together for construction cost, and studies have been becoming demanded in a recent situation that super large and super light spatial structures have been constructed. This paper investigates the relationship between reliability index β and snow load factor γs for anti-buckling design of a simply supported cylindrical lattice shell roof under simultaneous action of both dead load and asymmetric snow load. The cylindrical lattice shell analyzed is composed of an equilateral triangle grid of which members are of steel circular hollow sections. Members are connected rigidly to nodes at their both ends. The snow distribution as a main target is assumed in a way that the snow depth on the half of the arch-like roof is half of the amount on the other half roof. The snow fall depth is here assumed 50cm evaluated as 100-year return period, and its probability is assumed as Gumbel distribution with 100-year reference period. The probability distribution of buckling strength Pcr including geometrical and material nonlinearities is approximately evaluated based on a first-order perturbation. The reliability is calculated based on AFOSM, and the relationship in a form of β to γs is finally expressed for design use.

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非对称雪荷载作用下圆柱格壳屈曲设计的荷载系数评估

载荷系数是抗屈曲设计的关键因素之一，对其进行研究已成为近年来超大型、超轻型空间结构建设的迫切需要。本文研究了静载和非对称雪荷载同时作用下简支圆柱格壳屋盖抗屈曲设计的可靠性指标β与雪荷载因子γs的关系。所分析的圆柱格壳由一个等边三角形网格组成，网格的构件为圆形空心型钢。成员与两端节点刚性连接。作为主要目标的雪分布是这样假设的:一半的拱形屋顶上的雪深是另一半屋顶上雪量的一半。这里假定降雪深度为50cm，评估为100年的重现期，假定其概率为参考周期为100年的Gumbel分布。基于一阶微扰近似计算了几何非线性和材料非线性的屈曲强度Pcr的概率分布。基于AFOSM计算了可靠性，并最终以β - γ - s的形式表示了可靠性，以供设计使用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the International Association for Shell and Spatial Structures ENGINEERING, CIVIL-

CiteScore

1.40

自引率

0.00%

发文量

期刊介绍： The Association publishes an international journal, the Journal of the IASS, four times yearly, in print (ISSN 1028-365X) and on-line (ISSN 1996-9015). The months of publication are March, June, September and December. Occasional extra electronic-only issues are included in the on-line version. From this page you can access one or more issues -- a sample issue if you are not logged into the members-only portion of the site, or the current issue and several back issues if you are logged in as a member. For any issue that you can view, you can download articles as .pdf files.