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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%。
Snow load has a relatively large impact on the structure of a large-span reticulated shell. Due to the effect of wind and temperature, the distribution of snow load on the roof is often not uniform. The most unfavorable arrangement for determining snow load is to ensure the safety of a large-span reticulated shell Design needs to be considered. In this paper, a partition combination method is proposed to determine the most unfavorable arrangement of single-layer spherical reticulated shell structure under the effect of roof snow load. Firstly, the roof is divided into eight sectors in the radial direction, Sector permutations and combinations to calculate the ultimate bearing capacity of the structure to determine the most unfavorable radial arrangement of snow load, and then the roof is divided into six rings according to the ring direction to calculate and determine the snow load ring the most unfavorable layout, the final combination Radial and circumferential two cases, to determine the single-layer spherical reticulated shell structure of the most adverse layout of snow load. The results show that the ultimate bearing capacity of the structure is the lowest when the snow loads are arranged on the half-span and the outermost two rings, which decreases by 24.8% and 16.3% respectively compared with the full-span and half-span loads.