单层球面网壳结构屋面雪荷载最不利布置研究

发布时间：2018-11-29 07:14

【摘要】：雪荷载对大跨网壳结构的影响相对较大,而且由于风及温度等的作用,雪荷载在屋面的分布往往是不均匀的,确定雪荷载的最不利布置是保证大跨网壳结构安全设计需要考虑的问题。该文提出了一种分区组合法来确定单层球面网壳结构在屋面雪荷载作用下的最不利布置,该方法首先将屋面沿径向分为8个扇区,分别考虑雪荷载布置在不同扇区的排列组合,计算结构的极限承载力,确定雪荷载的径向最不利布置,然后再将屋面按环向分为6个环区,计算并确定雪荷载环向最不利布置,最后组合径向和环向两种情况,确定单层球面网壳结构雪荷载的最不利布置。研究结果表明,当雪荷载布置在半跨并且是最外两环时,结构的极限承载力最低,比满跨和半跨雪荷载工况分别降低24.8%和16.3%。
[Abstract]:The influence of snow load on long-span latticed shell structure is relatively large, and the distribution of snow load in roof is often uneven due to the effect of wind and temperature, etc. Determining the most unfavorable arrangement of snow load is the problem to be considered to ensure the safety design of long span latticed shell structure. In this paper, a partition combination method is proposed to determine the most unfavorable arrangement of single-layer spherical reticulated shell structure under snow load on the roof. Firstly, the roof is divided into eight sectors along the radial direction, and the arrangement and combination of snow loads in different sectors are considered respectively. Calculate the ultimate bearing capacity of the structure, determine the radial unfavorable arrangement of the snow load, then divide the roof into six circumferential regions according to the circumferential direction, calculate and determine the most disadvantageous arrangement of the snow load in the circumferential direction, and finally combine the radial and the circumferential situations. The most unfavorable arrangement of snow load for single-layer spherical reticulated shell structure is determined. The results show that when the snow load is arranged in half span and is the outermost two rings, the ultimate bearing capacity of the structure is the lowest, which is 24. 8% and 16. 3% lower than that of full span and half span respectively.
【作者单位】：河南大学土木建筑学院钢与空间结构研究所;浙江大学土木工程系;
【基金】：国家自然科学基金项目(U1304527) 河南省教育厅项目(2009056A002)
【分类号】：TU399

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