焊接不锈钢工字形截面受弯构件整体稳定与设计方法  

Analysis on Overall Buckling Behavior of Stainless Steel Welded I-beams and Design Methods

作　　者：王元清[1,2] 高博[3,4] 戴国欣[4] 石永久[1,2] 

机构地区：[1]清华大学土木工程系 [2]土木工程安全与耐久教育部重点实验室,北京100084 [3]中国建筑西南设计研究院有限公司,成都610000 [4]重庆大学土木工程学院,重庆400045

出　　处：《土木建筑与环境工程》2013年第1期57-62,69,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：北京市自然科学基金(8112018)

摘　　要：总结了作者在清华大学完成的一批焊接不锈钢梁在弯矩荷载作用下的整体稳定性能试验,试验以试件的长细比为主要变化参数,对8根工字形截面梁进行了研究。试验的材料是奥氏体型316冷轧板,材料应力-应变关系通过拉伸试验获得;同时采用有限元软件ANSYS建立包含初始缺陷的有限元模型,对试件的极限承载力和荷载-变形关系进行分析,并与试验结果进行了对比,以证明有限元分析的合理性和适用性,为进一步研究奠定基础。同时,还将试验结果与欧洲规范和作者的建议设计方法进行了对比。分析结果表明:通过合理建模的有限元分析结果与试验结果吻合良好,有限元分析能够合理的模拟焊接不锈钢梁的整体稳定性能,作者所建议的设计方法的计算结果与欧洲规范相近,能够应用于工程设计并保证足够安全。Eight specimens were tested under pure bending to investigate the overall buckling behavior of stainless steel welded I-beams, and the main parameter varied in experimental study was slenderness ratio. The test specimens were fabricated from cold rolled plate of austenitic stainless steel type 316. The material properties were determined by tensile coupon tests. A non-linear finite element model is developed and verified against test results. Initial imperfection and material non-linearities were included in the finite element model. In addition, the buckling strength of test specimens were compared with the design method proposed in the previous research. It is shown that the finite element model closely predicted the overall buckling strength and load-deformation curves; the design method was proved to be safe.

关 键 词：不锈钢 焊接工字梁 整体稳定性 试验研究 有限元方法 

分 类 号：TU391[建筑科学—结构工程]