对地下室顶板合理施加消防车荷载的方式讨论

Discussion on ways to reasonably apply fire truck load to basement roof

为分析地下室顶板局部范围消防车荷载对顶板受力的影响,根据消防车道位置对不同覆土厚度下消防车轮压对地下室顶板产生的弯矩,通过有限元方式计算得出地下室顶板等效均布荷载,与部分设计项目采用的消防车荷载输入方式进行比较,讨论在各种情况下荷载输入的合理性。计算结果表明:如消防车道外的相邻板跨不考虑轮压扩散的荷载计算方法,只在消防车道内布置消防车荷载,板内实际等效荷载偏小,容易造成一定的安全隐患。

In order to analyze the influence of fire truck load on the roof force in the local area of the basement roof, according to the position of the fire lane and the bending moment generated by the fire wheel pressure on the basement roof under different covering thicknesses, the finite element method is used to calculate the equivalent uniform load on the roof of the basement to compare with the load input method of the fire truck adopted in some design projects, and to discuss the rationality of the load input under various conditions.The calculation results show that if the load calculation method of wheel pressure diffusion of the adjacent slab span outside the fire lane does not been considered, and the fire truck load is only arranged inside the fire lane, the actual equivalent load inside the slab is small, which may cause certain safety hazards.