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高耸结构的震害资料表明,竖向地震作用对结构的破坏起很大的作用。根据冲击原理,考虑场地土的影响,对高耸结构的竖向地震作用进行了计算分析。结果表明,场地土类别对竖向地震作用的影响较大,场地土类别越高,竖向地震力越大。Ⅱ类场地土上的烟囱在9度区才会产生竖向拉力;Ⅳ类场地土上的烟囱在7度区就会产生竖向拉力,在9度区则会产生非常大的竖向拉力和竖向压力。因此在高耸结构的竖向地震作用计算中,场地土的影响因素应引起足够的重视。
Earthquake damage information of towering structures shows that the vertical seismic effect plays a significant role in structural damage. According to the principle of impact and considering the influence of site soil, the vertical seismic action of towering structure is calculated and analyzed. The results show that the field soil category has a great influence on the vertical earthquake effect, and the higher the site soil category, the greater the vertical earthquake force. Class Ⅱ site soil chimney in the 9 degree zone will produce vertical tension; Class Ⅳ site soil chimney in the 7 degree zone will produce vertical tension in the 9 degree zone will have a very large vertical tension and Vertical pressure. Therefore, in the calculation of vertical seismic action of towering structures, the influencing factors of site soil should be given sufficient attention.