高层建筑钢结构基于风振响应和动力特性的优化设计

An Automatic Computer Based Technique for Integrated Wind Load Updating and Lateral Stiffness Design Optimization of Tall Steel Buildings

高层建筑的风致响应和等效静力荷载虽然可以通过风洞试验和动力分析有效的加以确定,在结构设计的整个过程中这些等效风力却往往被当作常数来应用。本文提出了一个结合气动风力分析和结构刚度优化的自动化技术。在结构设计中利用这个技术,可以在优化结构刚度和最小化结构造价的同时,实时检查和更新作用在建筑结构上的等效风荷载。一个几何尺度与航空研究共同顾问理事会(CAARC)建议的建筑模型一致的钢框架结构被用来进行风力分析和结构优化的例子。结果表明这个技术不但能在满足位移设计要求的情况下优化结构刚度降低造价,而且也降低了作用在结构上的等效风力。

Although current wind tunnel techniques provide accurate prediction of the wind-induced loads on tall buildings,design practice normally considers these loads as constant static design loads throughout the design process.This paper presents a computer based technique that couples together an aerodynamic wind load analysis and an element stiffness design optimization procedure to minimize the structural cost of tall steel buildings subject to lateral drift design criteria while allowing for instantaneous prediction and updating of wind loads during the design synthesis process.Results of a full-scale steel building framework having the same geometry as the Commonwealth Advisory Aeronautical Research Council（CAARC） standard building indicate that the proposed technique is able not only to produce the optimal element stiffness distribution of the structure satisfying the serviceability wind drift design criteria,but also to achieve a potential benefit of reducing the wind-induced structural loads on buildings.