钢箱梁构造细节对局部疲劳应力的影响研究  

Study on the Influence of Construction Detail on Local Fatigue Stress in Steel Box Stress

作　　者：赵月悦 吉伯海[1] 傅中秋[1] 陈雄飞[2] 汪峰[2] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]江苏扬子大桥股份有限公司,江苏靖江214500

出　　处：《公路工程》2014年第6期43-48,共6页Highway Engineering

基　　金：国家自然科学基金项目(51278166);高等学校博士学科点专项科研基金项目(20120094110009);江苏省交通科学研究计划项目(2011Y09-1;2012Y13)

摘　　要：以江阴大桥的主梁钢箱梁为工程背景建立有限元模型,针对钢箱梁桥面板U肋与顶板连接处焊缝,研究了不同构造细节对局部疲劳应力的影响,提出了钢箱梁桥面板合理构造建议。分析表明:随着板厚的增加,焊缝位置的应力值依次降低;焊缝位置的应力幅值随着过焊孔半径的增大呈增长趋势;桥面铺装弹性模量及厚度的适当提高有助于降低焊缝处的应力幅,但泊松比对应力幅影响很小。建议考虑经济性条件下,桥面板取合理板厚,顶板与U肋连接处不设置过焊孔,桥面铺装采用弹性模量1 400 MPa以上的材料或增加桥面铺装厚度到70 mm左右。The finite element model is Bridge, and the local fatigue stress is analyzed at ences of different construction details to fatigue stress are analyzed and reasonable suggestions for con- struction details are given. As a result, the stress value of the weld position reduces with the increases of the thickness; The stress amplitude at the position rises while the welding hole radius increases;The stress amplitude is obviously reducedwhen the elastic modulus and thickness of pavement increase,while the influence of the Poisson ratio is slight. Considering economy conditions, the reasonable thickness is suggested ; setting welding hole is not recommended; material with elastic modulus more than 1 400 MPa or increasing the pavement thickness to 70 mm are suggested.

关 键 词：钢箱梁 疲劳 构造细节 局部应力 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]