地下室顶板大跨度双向板消防车活荷载取值探讨

Discussion on the Value of Live Load of Fire Truck with Large Span Two-way Slab on Basement Roof

针对地下室顶板大跨度的双向板在2辆或3辆消防车作用下的等效活荷载开展研究,通过考虑覆土对消防车荷载的扩散作用,计算得到不同覆土深度处2辆和3辆消防车共同作用下的竖向荷载标准值,根据结构效应的等效原则求得6m,8m,10.5m 3种跨度的梁、板、柱的等效均布活荷载,并提出相应设计建议。与规范给出的消防车均布活荷载取值相比,本文计算出的结果可以使地下室大跨度双向板的设计更加安全经济。

The study considers the equivalent live load of a two-way slab with a large span of the basement roof under the action of two or three fire trucks.By considering the diffusion effect of the covering soil on the load of the fire truck,the vertical load standard values of two and three fire trucks at different soil depths are calculated.According to the equivalent principle of structural effect,the equivalent uniform live loads of beams,slabs and columns with spans of 6m,8m and 10.5m are obtained,and corresponding design suggestions are proposed.Compared with the average live load value of the fire truck given by the specification,the results calculated in this paper can make the design of large span two-way slab on basement roof safer and more economical.