【摘要】 本文论证了弹性体系切缝后自振频率下降的特性,提出了按无切缝体系自振特性来推算切缝后自振特性的简便方法——升阶摄动法,并给出用该法计算重力坝和重力拱坝切缝后自振特性的算例,与用有限元法计算和试验数据比较,结果基本相符。更多还原

【Abstract】 The frequency drop of free vibration of an elastic structure after artificial gapping is demonstrated in this paper. Accordingly,a simplified method——"ascending the matrix order and perturbation" is proposed to reckon the free vibration characteristics of an elastic structure with gaps by those of gapless ones. Numerical examples calculating the free vibration charateristics of gapped gravity dam and arch dam are given. The results conform fairly well to that obtained by finite element method or experiments.更多还原