%0 Journal Article
%T 正交异性钢桥面板U肋与横隔板构造细节围焊处疲劳性能<br>Fatigue performance on the rounded welding region of U-rib and diaphragm of orthotropic steel bridge deck
%A 吕彭民
%A 王龙奉
%A 李大涛
%A 雷　江
%A 张晓琳
%J 长安大学学报(自然科学版)
%D 2015
%X 为了研究正交异型钢桥面板的U 肋与横隔板连接处的疲劳性能，以九江长江公路大桥正交异性钢桥面板的U肋与横隔板处焊缝细部构造为研究对象，通过实桥结构有限元分析及其局部结构子模型法进行的精细分析，得到了该细部结构焊缝处的应力分布及疲劳危险点；以疲劳试样关注点应力状态应与实桥对应位置应力状态相同的设计原则设计了疲劳试样。对疲劳试样进行了有限元分析、应力测试和疲劳试验。研究结果表明：疲劳试样与实桥在U肋与横隔板焊缝处的应力变化规律相一致，最大应力发生在U肋与横隔板焊缝围焊处的焊址部位；疲劳裂纹首先发生在Ｕ肋与横隔板焊围焊处，然后沿焊缝向两侧扩展；同时得到了该处的S-N曲线以及容许应力幅值；研究成果为大桥的疲劳寿命评估和养护维修提供依据，也为其他桥梁设计提供参考。<br>In order to study the fatigue performance on the connecting part of U-rib and diaphragm of bridge deck, detail structure of bridge deck of Jiujiang Yangtze river expressway bridge was studied in this paper. Through finite element analysis on the bridge structure and precise analysis on the sub-model of local structure, the stress distribution in weld of structural detail and the dangerous point were obtained; The specimen was designed based on the principle that the stress distribution of interest point on specimen was the same with the homologous position of the bridge. Finite element analysis, stress measurement and fatigue test were carried out on fatigue specimens. The results are shown as follows: The stress change pattern of fatigue specimen and real bridge is the same in U rib and diaphragm, and the maximum stress occurs at the site of around weld toe in U rib and diaphragm; The fatigue crack is first produced around the weld toe in U rib and diaphragm, and then expands along the weld direction. At the same time, S-N curve and allowable stress amplitude are obtained. The results can be used for evaluation of fatigue life, maintenance and repair of the bridge, which can also provide reference for other bridge design. 1 tab, 19 figs, 16 refs
%K 桥梁工程
%K 正交异性钢桥面板
%K U 肋
%K 横隔板
%K 子模型&lt
%K br&gt
%K bridge engineering
%K orthotropic steel bridge deck
%K U rib
%K diaphragm
%K sub model
%U http://zzszrb.chd.edu.cn/oa/DArticle.aspx?type=view&id=20150609