高强钢双肢连接受压杆塔构件稳定机理及设计理论研究

项目名称： 高强钢双肢连接受压杆塔构件稳定机理及设计理论研究

项目编号： No.51208002

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： 曹现雷

作者单位： 安徽工业大学

项目金额： 25万元

中文摘要： 使用高强钢能减轻结构自重、降低造价、节约能源，具有良好的经济和社会效益。本项目结合国内外杆塔结构的最新发展，采用数值模拟、试验研究和理论分析相结合的方法，深入研究高强钢双肢连接杆塔构件受压稳定性能。利用能够准确模拟构件端部约束条件和初始缺陷的数值模型，研究钢材强度、截面形式、长细比、板件宽厚比、几何初始缺陷及截面残余应力模式等因素的影响。结合高强钢截面残余应力测量试验、短柱受压试验、子结构试验和构件轴心受压试验，着重研究高强钢截面残余应力分布、钢材强度与板件宽厚比和临界长细比关系、板件局部屈曲与构件整体失稳影响等问题，提出高强钢双肢连接杆塔构件局部屈曲、整体稳定承载能力及其相关性失稳的设计方法。项目成果为阐明钢材强度影响轴心受压构件的失稳机制、揭示高强钢轴心受压构件整体失稳与板件局部失稳的相关性定量关系、完善现行杆塔结构设计理论、推广高强度钢材的工程应用和实现我国节能减排目标具有重要意义。

中文关键词： 高强钢；杆塔结构；模型试验；失稳；设计

英文摘要： The application of high strength steel can reduce structure weight, reduce cost, save energy, and achieve good economic and social benefits. With the latest development of pole and tower structures in our country and foreign countries, adopting the method of combining numerical simulation, experimental study and theoretical analysis, this project has deeply investigated the compression stability of the high strength pole and tower compression members with two legs connection. Created the numerical model which can accurately simulate the end restraint and the initial imperfection of the member, studied the influence of steel grade, member section type, slenderness, the width-to-thickness ratio, the initial geometrical imperfection and residual stress distribution pattern etc on the compression buckling behaviour of the high strength pole and tower compression members with two legs connection. Based on the research work of this project including material characteristic tests, residual stress distribution measurement tests, short columns compression tests,sub-structure tests and members axial compression tests, focused on the impact of the problems, which were the researches of the residual stress distribution of high strength steel cross-section, the relationship between steel grade and the plate width-to-thicknes

英文关键词： high-strength steel；pole and tower structure；model test；instability；design