铰支轴心受压高强钢管的局部稳定强度折减系数  

Strength Reduction Factor Caused by Local Stability for Simply Supported High Strength Steel Tube Subjected to Axial Compression Load

作　　者：杨隆宇[1] 李正良[1] 刘红军[1] 

机构地区：[1]重庆大学土木工程学院,重庆400030

出　　处：《四川大学学报（工程科学版）》2010年第4期203-208,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50678181);国家电网公司科技项目(SGKJ[2007]413)

摘　　要：中国特高压输电塔发展趋势是采用高强钢管塔,国内相关规范中Q420以上强度钢材设计参数不足。对20组不同材料和几何尺寸的高强钢管进行两端铰支轴压试验,并结合有限元计算及国内外相关规范分析其整体和局部稳定性。结果表明,Q420、GR65及Q460钢管轴压强度高于中国规范中对应计算值,且随屈服强度上升这种提高越明显。得出局部稳定强度折减公式是有限元计算值和试验值的下限,可供特高压输电杆塔设计作参考。The developmental trend of EHV transmission tower is high strength tube tower. However,present research has been mainly focused on angle tower and domestic design codes do not contain design parameters of steel whose strength is higher than Q420. For this issue,pin-ended experiment of 20 different axially loaded high strength steel tubes was conducted,and the stability analysis of the tubes was done by means of FEA and related codes. The experiment and analysisshowed that Q420,GR65 and Q460 steel tubes have higher strength than corresponding values in domestic codes,and the trend becomes more and more obviousalong with the increase of steel yield strength. The propositional strength reduction formula covered the lower limit of FEA calculation and experimental values,and could be used as a reference for the corresponding designs.

关 键 词：高强钢管 稳定性 试验研究 强度折减 特高压输电塔 

分 类 号：TU279.7[建筑科学—建筑设计及理论] TM753[电气工程—电力系统及自动化]