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本文提出高层建筑顶部突出物弹性地震力的一个近似和实用的计算方法。文中在把主体结构(不包括顶部突出物的结构主体)的每个振型看成为一个广义单自由度体系的基础上,分别考虑了这些广义单自由度体系对顶部突出物地震力的影响。并在应用振型组合的原则对这些影响进行组合后,得到了结构顶部突出物弹性地震力的计算公式。根据本文方法对工程实例的计算结果表明,本文方法具有足够的精度,是实用的。
This paper presents an approximate and practical calculation method for the elastic seismic force of the top projecting high-rise building. In this paper, considering each vibration mode of the main structure (excluding the structural body of the top overhang) as a generalized single degree of freedom system, the influence of these generalized single degree of freedom systems on the seismic forces of the top overhang is considered separately. After combining these effects in the application of the principle of combination of vibration modes, the formula for the elastic seismic force at the top of the structure was obtained. The calculation results of the engineering examples based on this method show that this method has sufficient accuracy and is practical.