以建设中世界最高输电铁塔——346.5m高、500kV江阴大跨越塔为工程背景，通过气弹模型风洞试验，对大跨越输电塔线体系动力特性和风振响应进行了研究。采用外形、质量、刚度分离的处理方法设计了大跨越塔模型，塔线体系为两塔三段线模型。用自由振动法测得单塔和塔线体系的自振频率和阻尼比，进行了多个风速下单塔、塔线体系在均匀流场和紊流场中的风洞试验。通过对试验结果的分析，揭示了大跨越输电塔线体系动力特性和风振响应特点，为实际工程抗风设计提供了依据。

A system reliability estimation method for spatial jacket platforms is developed in this paper. The jacket platform is modeled into three-dimensional assembly of spatial beam and plate elements in Finite Element Method (FEM). The limit failure states correspond to collapse of a series of structural members which are identified by engineering design criteria. In this paper the following aspects are taken into account: the punching shear and buckling failures in member failure modes for the tubular joints and tubular columns respectively; incremental loading approach for establishment of the safety margin equations of system failure; the algorithm of enumerating significant failure modes for the structural systems and other concepts, such as the false failure mode and the virtual limit state. The final work is devoted to the reliability analysis for a practical jacket platform presently put into operation on the Bohai Sea. The computed results shows that method suggested in this paper is feasible and effective for the evaluation of the system reliability of offshore platforms.