【摘要】 针对土体与埋置在土体中的管段以及沉管隧道各个柔性接头处不同构件之间的动力相互作用,采用基于超级计算机的三维接触模型对上海某沉管隧道进行了地震响应分析,并进行了三维接触算法的研究。整个模型单元数超过了120万,节点数超过了100万。研究证明,应用文中提出的接触模型和算法可将接触处理的CPU时间大大缩短。地震波载荷选用调幅后的唐山地震波,应用通用非线性动力分析有限元程序LS-DYNA进行求解,计算结果可为隧道的抗震设计提供有力依据。更多还原

【Abstract】 Aimed at the contact between different parts in immersed tunnel,three-dimensional contact model based on supercomputer is adopted to deal with the seismic response of the immersed tunnel in Shanghai,the total model contains 1.2 million elements and a million nodes.The proposed model enables to shorten remarkably the CPU time of contact calculation.Taken the amplitude modulated Tangshan Seismic wave as the simulated input,nonlinear dynamic analysis program LS-DYNA is chosen to carry out the earthquake-resistant analysis of the immersed tunnel to provide sufficient evidences for the anti-seismic design of the immersed tunnel.更多还原