沉箱式防波堤受衝擊碎波壓力之動力分析

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DYNAMIC ANALYSIS OF CAISSON-TYPE BREAKWATER

UNDER THE ACTION OF

IMPULSIVE BREAKING WAVE PRESSURE

Chuen-Sheng Yang

Professor Department of Hydraulic Engineering

ABSTRACT

A caisson-type breakwater will slide, rotate, or vibrate under the action of impulsive breaking wave pressure with high intensity but with a short

duration. _{The motion of breakwater under the action of wave pressure has}

been analysed with the assumption that the impulsive pressure has a time profile of triangular shape or a damped sine function of time. The magnitude

of impulsive pressure is calculated with the forward momentum of breaking _{. .}

waves; its impulse is constant. The breakwater is considered to be rested

upon an elastic foundation or upon a rigid base. The resuit of analysis shows that the maximum elastic shearing force of the base may reach 2.2 times the maximum intensity of breaking wave pressure. The resonance or overturning may take place under the continuous action of breaking waves.

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