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(一) 拱埧的自振頻率,是一个空間計算問題,由於埧基地質、地形等边界条件比較复杂,加上埧体的断面也是多种多样,企图从理論上推导精确的計算公式是有困难的。錢先生曾根据拱埧振动的特性,假定一个变位方程式,用能量法計算庫空和庫滿時的自振頻率,並用模型試驗成果來驗證,筆者認为这確是一个切实可行的途逕。 原文確定振动变位方程式时,必須先假定一个公式,按理論方法算得自振頻率,与
(1) The frequency of natural vibration of arches is a spatial calculation problem. Since the boundary conditions such as the sill-based geology and topography are more complex, and the cross section of the corpus callosum is also diverse, it is attempted to theoretically derive an accurate formula. difficult. Based on the characteristics of the vibration of arches, Mr. Qian used the energy law to calculate the free vibration frequency of the empty space and the full library and verified it with model test results. The author believes that this is indeed a feasible approach. When determining the vibrational displacement equation in the original text, a formula must be assumed, and the natural frequency is calculated according to the theoretical method.