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钢筋混凝土单层厂房沿纵向的抗震设计,目前仍广泛采用视屋盖为刚性盘体的单自由度计算简图。该简图适用于单跨厂房或刚度质量分布均匀的多跨单层厂房,而如果套用到具有纵墙的多跨单层厂房,就会出现计算结果与震害分布规律不相符的情况。本文把屋盖视为有限刚度的剪切梁,推荐一种多自由度的厂房纵向地震力计算简图,并按照我国抗震设计规范的要求编写之电算程序予以计算。通过六个算例说明该方法的计算结果与厂房震害的分布规律比较一致。
In the longitudinal seismic design of a reinforced concrete single storey building, the calculation of the single degree of freedom of the rigid roof is still widely used. The diagram is applicable to a single-span factory building or a multi-span single-story building with uniform mass distribution. If a multi-span, single-story building with vertical walls is used, the calculation results may not be consistent with the earthquake damage distribution. In this paper, the roof is considered as a shear beam with limited stiffness, a multi-degree-of-freedom longitudinal seismic force calculation diagram is recommended, and calculated according to the computer program written in accordance with the requirements of China’s seismic design specification. Through six examples, it is shown that the calculation results of this method are consistent with the distribution law of factory earthquake damage.