【摘要】 根据基础振动弹性半空间理论的最新成果,推导出一个计算明置基础扭转振动的复合集总参数模型。采用该模型对复杂形状的明置块体基础在扭转谐和扰力作用下的动力响应进行计算,并将振幅计算结果与采用由弹性半空间理论所得到的基础扭转振动刚度和阻尼公式(由大量试验、数值计算所证实)的振幅计算结果进行比较,结果表明:两者结果非常吻合,误差仅为3.13%。利用该模型可以容易地计算在扭转扰力作用下任意频率、任意泊松比和任意形状(不包括环型)的均质半空间上块体明置基础的动力响应。更多还原

【Abstract】 A new torsional composite lumped parameter model(CLPM)was established based on the theory of surface foundation oscillation on a elastic half-space.With the new model(CLPM),torsionally dynamic responses of a complicatedly-shaped surface foundation was calculated and in good agreement with the results obtained by the formulas(supported by results of comprehensive experimental and numerical analysis),which have been developed by the theory of elastic half-space for computing the dynamic stiffness and damping coefficient of foundations harmonically torsional oscillating on a homogeneous half-space,the amplitude difference is only 3.13%.The new model can be used to easily determine the dynamic responses of arbitrarily shaped surface lumped foundations(except annular shape)with all range of oscillation frequencies and all range of Poisson’s ratios on homogeneous half-space under the torsional perturbation load.更多还原