CAJ | 학술논문

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1400 MPa 以上的材料或增加桥面铺装厚度到70 mm左右。
이강음대교적주량강상량위공정배경건립유한원모형，침대강상량교면판 U 륵여정판련접처한봉，연구료불동구조세절대국부피로응력적영향，제출료강상량교면판합리구조건의。분석표명：수착판후적증가，한봉위치적응력치의차강저；한봉위치적응력폭치수착과한공반경적증대정증장추세；교면포장탄성모량급후도적괄당제고유조우강저한봉처적응력폭，단박송비대응력폭영향흔소。건의고필경제성조건하，교면판취합리판후，정판여 U 륵련접처불설치과한공，교면포장채용탄성모량1400 MPa 이상적재료혹증가교면포장후도도70 mm좌우。
The finite element model is established based on the steel box girder in Jiangyin Bridge,and the local fatigue stress is analyzed at the position of U rib to deck weld connections.The influ-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.