In this study, simplified numerical models are developed to analyze the soil-structure interaction （SSI） effect on frame structures equipped with viscoelastic dampers （VEDs） based on pile group foundation. First, ...In this study, simplified numerical models are developed to analyze the soil-structure interaction （SSI） effect on frame structures equipped with viscoelastic dampers （VEDs） based on pile group foundation. First, a single degree-of- freedom （SDOF） oscillator is successfully utilized to replace the SDOF energy dissipated structure considering the SSI effect. The equivalent period and damping ratio of the system are obtained through analogical analysis using the frequency transfer function with adoption of the modal strain energy （MSE） technique. Aparametric analysis is carried out to study the SSI effect on the performance of VEDs. Then the equilibrium equations of the multi degree-of-freedom （MDOF） structure with VEDs considering SSI effect are established in the frequency domain. Based on the assumption that the superstructure of the coupled system possesses the classical normal mode, the MDOF superstructure is decoupled to a set of individual SDOF systems resting on a rigid foundation with adoption of the MSE technique through formula derivation. Numerical results demonstrate that the proposed methods have the advantage of reducing computational cost, however, retaining the satisfactory accuracy. The numerical method proposed herein can provide a fast evaluation of the efficiency of VEDs considering the SSI effect.展开更多
文摘随着既有建筑减震加固需求的不断增加,如何从抗震韧性的新角度评估减震加固方案的合理性成为一个需要关注的问题。该文以一栋高层钢结构减震加固为例,从抗震韧性的角度对两种减震方案进行对比。首先基于数学算法,从PEER(Pacific Earthquake Engineering Research Center)地震动数据库中选取20条地震波,使所选地震动的加速度反应谱均值和目标谱吻合,并实现每条反应谱在结构基本周期点和目标谱完全吻合;通过3000次蒙特卡洛模拟,得到修复费用、修复时间和伤亡率的对数正态分布函数,并取84%分位值作为代表值,以比较两种加固方案的优劣;提出加固收益率的概念,并从加固收益的角度重新评估两种方案的经济效益,结果表明阻尼器较多的加固方案可能造成加固成本大于修复成本,使阻尼器数量较少的加固方案更加经济合理。该文的工作是抗震韧性在减震加固中方案评估中的应用,完善减震加固理论体系,为抗震韧性的在减震加固工程中的应用提供借鉴。
基金National Natural Science Foundation of China under Grant Nos.51678302 and 51678301Jiangsu Province Industry-University-Research Joint Innovation Fund--Prospective Joint Research Project under Grant No.BY2014005-05Major Program of Natural Science Foundation of the Jiangsu Higher Education Institutions of China under Grant No.14KJA560001
文摘In this study, simplified numerical models are developed to analyze the soil-structure interaction （SSI） effect on frame structures equipped with viscoelastic dampers （VEDs） based on pile group foundation. First, a single degree-of- freedom （SDOF） oscillator is successfully utilized to replace the SDOF energy dissipated structure considering the SSI effect. The equivalent period and damping ratio of the system are obtained through analogical analysis using the frequency transfer function with adoption of the modal strain energy （MSE） technique. Aparametric analysis is carried out to study the SSI effect on the performance of VEDs. Then the equilibrium equations of the multi degree-of-freedom （MDOF） structure with VEDs considering SSI effect are established in the frequency domain. Based on the assumption that the superstructure of the coupled system possesses the classical normal mode, the MDOF superstructure is decoupled to a set of individual SDOF systems resting on a rigid foundation with adoption of the MSE technique through formula derivation. Numerical results demonstrate that the proposed methods have the advantage of reducing computational cost, however, retaining the satisfactory accuracy. The numerical method proposed herein can provide a fast evaluation of the efficiency of VEDs considering the SSI effect.
