【摘要】 由于当前动力分析中所使用的阻尼模型无法描述结构内未知的材料非线性能量耗散,基于应力相关复阻尼理论,推导出多自由度复阻尼系统的震动能量方程,研究了复阻尼模型的结构震动响应和材料能量耗散规律,计算了构件和结构的时变材料损耗因子.研究结果表明,在地震总输入能量中,材料阻尼耗能占很大比例,并随时间单调增加,结构的材料阻尼耗能及其变化率、动能、应变能均随着能量输入的增加而增加.通过对损耗因子的计算表明,与传统方法相比,采用时变形式而非常数形式的材料损耗因子能够更精细地体现材料阻尼效应.更多还原

【Abstract】 Since the damping models used in current dynamic analysis could not describe the unknown material nonlinear energy dissipation in structures,the seismic energy equation for multiple degrees of freedom(MDOF) complex damping system was derived based on the stress related complex damping theory.The structure seismic response and material energy dissipation rule of the complex damping model were studied,and the material time varying loss factor of components and structures was calculated.The results show that in the total earthquake input energy,the material damping energy dissipation accounts for a large proportion,and monotonously increases with prolonging time.The material damping energy dissipation as well as its change rate,kinetic energy and strain energy of the structure all increase with increasing the input energy.The calculation of the loss factor indicates that compared with the conventional method,the material loss factor with adopting time varying form rather than constant form can exhibit the material damping effect more precisely.更多还原