对一座48m高三方五层纤绳的三角形断面格构式桅杆进行了动力实测，用加速度传感器分别测得在初位移激励和脉动风荷载下的结构响应，同时用风速仪记录了实测时的风速. 根据实测结果分析了该桅杆结构的动力特性和风振响应的特征。结果表明弯扭振动为桅杆的主要振动；桅杆1阶振型阻尼比约为0.031，高阶振型的阻尼比为0.015左右。桅杆的自振频谱密集，结构风振响应具有明显的宽带特性，带宽参数为0.75～0.89。由于桅杆的非线性特征，结构杆身在风荷载作用下的加速度响应为非Gauss过程，峰态系数都大于3.0根据实测结果，对这种悬挂天线的无线电发射桅杆在分析和计算过程中应该注意的问题提出了建议。

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.

本文介绍了作者开发的适用于固定式导管架海上平台结构系统疲劳与疲劳可靠性分析程序系统的设计原理、结构及功能特点。最后, 以一固定式导管架平台作为算例验证了程序系统的可靠性与实用性。

桅杆结构随机风振疲劳是宽带随机疲劳过程。本文基于结构宽带随机疲劳理论，给出桅杆结构随机风振疲劳分析方法。结合桅杆模型风洞试验结果，得出桅杆结构宽带随机疲劳分析的谱宽参数ε和修正系数λ。最后，通过一个工程算例，进一步给出用等效应力法、等效窄带法及雨流法计算桅杆结构风振疲劳分析过程。并得出了一些有益于工程设计参考的结论。