钢格构式塔架结构风振疲劳寿命中几个关键问题研究

项目名称： 钢格构式塔架结构风振疲劳寿命中几个关键问题研究

项目编号： No.51208291

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 王钦华

作者单位： 汕头大学

项目金额： 25万元

中文摘要： 钢格构式塔架结构广泛的用于生产和生活中，该类结构具有轻质、柔性的特点。结构在设计时的强度往往是满足要求，但长时间较大幅度的风致振动会引起结构的疲劳破坏，这些结构的破坏给生产和生活带来很大的影响。本研究课题结合风荷载和格构式塔架结构的特征，对该类结构风振疲劳寿命研究中还存在的问题进行完善，主要内容包括：⑴同时使用两个高频底座天平对格构式塔架结构片段模型进行风洞试验，同步测量两个片段模型上的气动力，分析试验数据并拟合适用于该类结构气动力的相干函数；⑵在风洞试验测得气动力的基础上，建立既计算省时又满足精度要求的风振应力响应分析方法，并计算失效演化历程任意阶段中各个构件的风振应力响应；⑶分析构件的疲劳累积损伤并识别失效构件以及生成主要失效模式的安全余量方程,在主要失效模式的安全余量方程中体现风向和平均风速联合随机变量的影响。本研究课题为钢格构式塔架结构的风振响应分析、疲劳寿命设计提供参考。

中文关键词： 格构式塔架结构；风振疲劳；高频天平风洞试验；失效模式；

英文摘要： Steel lattice towers are widely used in industry and daily life, the structure is generally light, flexible and low damping. The stress intensity of structure often meets the demand of related code during the course of design, but long-time and large amplitude vibration of structure cause wind-induced fatigue failure under wind load, which brings negative impacts to industrial production and daily life. The program focuses on three key problems on wind-induced fatigue life taking the characters of wind load and lattice tower into account, the main contents of the program are as follows.⑴ The synchronous aerodynamics on two model of lattice structure will be measured in the wind tunnel by simultaneously using two high-frequency base balance, and the coherence function of aerodynamics will be fitted based on results from wind tunnel test.⑵ The analysis method ,which meets the requirements of saving time and accuracy, will be established and then wind-induced stress responses of structure will be calculated during the each stage of failure evolution process based on results from wind tunnel test. ⑶Wind-induced fatigue damage of element will be calculated and furtherly safety residual equations for ultimate limit state of the structures will be established with consideration of joint distribution of wind spee

英文关键词： steel lattice tower；wind-induced fatigue；wind tunnel test of high-frequency base balance；failure model；