高强钢焊接工字梁整体稳定性能分析
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(1 天津大学建筑工程学院，天津 300072；2 天津大学滨海土木工程结构与安全教育部重点实验室，天津 300072)
［摘要］高强钢因其良好的材料性能已在建筑结构和桥梁结构中得到成功应用，但是我国尚未颁布相应的设计规范。同时鉴于国内鲜有针对高强钢梁整体稳定性能的研究成果，建立高强钢焊接工字梁的有限元模型，分析初始几何缺陷、残余应力、钢材强度等级、截面高宽比、荷载类型和截面形式对高强钢焊接工字梁整体稳定承载力的影响。结果表明，钢材强度等级越高，初始几何缺陷和残余应力对高强钢焊接工字梁整体稳定承载力的影响越小。建议了高强钢焊接工字梁整体稳定系数计算式。［关键词］高强钢; 焊接工字梁; 整体稳定; 残余应力; 影响因素中图分类号：TU391 文献标识码：A 文章编号：1002-848X(2015)21-0025-05
Investigation on overall buckling behavior of high strength steel welded I-beamsDing Yang1,2 , Guo Peng1(1 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2 Key Laboratory of Coast Civil Structures Safety China Ministry of Education, Tianjin University, Tianjin 300072, China)Abstract: High strength steel has been applied in the buildings and bridges successfully because of its good material properties. However, the corresponding design codes are not established. In view of few domestic research achievements of overall buckling behavior of high strength steel welded I-beams, the finite element analyses were performed. The effects on overall buckling capacity of high strength steel welded I-beams caused by the initial geometric imperfection, the residual stress, strength class of steel, section height-width ratio, load type and section form were investigated. The results indicate that the increasing in strength classes of steel results in the decreasing of the effects on overall buckling capacity of high strength steel welded I-beams caused by the initial geometric imperfection and the residual stresses. The calculation fomula for overall buckling coefficient of high strength steel welded I-beams is suggested.Keywords:high strength steel; welded I-beam; overall buckling; residual stress; influence factor
作者简介：丁阳，博士，教授，Email:dingyang@tju.edu.cn。
