In this paper , the mega structure and its characteristics are introduced . the mechanical models , analysis methods and the present seismic research condition of the structures are summarized . the main problems and the direction of further seismic research of the structures in future are pointed out 本文首先介绍了巨型结构及其特点，着重总结、论述了巨型钢结构的力学模型和分析方法及其抗震研究发展现状，指出了这种钢结构体系抗震研究中存在的主要问题，和今后需要进一步研究的方向。
However , immersed tunnels are generally build in soft soil shallowly and affected greatly by the earthquake . in view of its importance and underwater particularity , the destruction of immersed tunnels will be disastrous . accordingly , it is necessary to carry out earthquake - resistant research of immersed tunnels 然而，沉管隧道一般修建在软弱地层中，埋置浅，受地震影响大，同时由于沉管隧道的重要性及在水下的特殊性，一旦破坏将产生灾难性后果，因此，对沉管隧道进行抗震研究是十分必要的。
The vibration - reduction principle of viscous damper is to consume most portion of the input energy by viscous damping material during the earthquake and wind so as to diminish vibration response of structures and insure structures " safety , and this technique has been becoming one of the main tendency of earthquake - resistant engineering research 粘滞阻尼器的控振原理是通过粘滞阻尼来耗散输入结构的大部分振动能量，以减少结构的振动反应，保证结构在地震和风荷载作用下的安全；消能减震技术现已成为工程抗震研究的主要发展方向之一。
