基于路面破损的车-钢桥面板裂纹扩展研究  

Crack Propagation of Vehicle-Steel Bridge Deck Slabs Based on Pavement Damage

作　　者：汤胜 殷新锋 张明 晏万里 TANG Sheng;YIN Xinfeng;ZHANG Ming;YAN Wanli(School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China;Zhejiang Jiaotou Traffic Construction Management Co.,Ltd.,Hangzhou,Zhejiang 310000,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114 [2]浙江交投交通建设管理有限公司,浙江杭州310000

出　　处：《中外公路》2025年第1期135-145,152,共12页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:52078057)。

摘　　要：为研究不同路面破损情况下车辆对桥梁钢桥面板顶板焊趾裂纹扩展影响,该文建立悬索桥、精细化车辆及局部钢桥面板有限元模型,设置多组障碍物高度模拟路面破损,利用显式动力分析程序,实现车桥耦合振动模拟,提取不同车道、车速及障碍物高度下车辆对钢桥面板的作用力,并施加到局部钢桥面板模型获得顶板焊趾裂纹扩展寿命值。结果表明:①路面破损下车辆对桥梁的冲击效应会加快钢桥面板疲劳失效。行驶在正常路面不能使顶板焊趾裂纹扩展,而在路面破损下存在裂纹扩展寿命;②同一车道内顶板焊趾裂纹扩展寿命随行驶车速的增加而缩短,随障碍物高度的增加先减少后增加;③车道3中车辆车速80 km/h时,存在顶板焊趾裂纹扩展起始障碍物高度80 mm与最不利扩展障碍物高度100 mm,而在障碍物高度60 mm存在顶板焊趾裂纹扩展起始行驶车速90 km/h。In order to study the influence of vehicles under different pavement damage conditions on crack propagation of welded toe at the roof of steel bridge deck slabs,finite element models of suspension bridges,fine vehicles,and local steel bridge deck slabs were established,and multiple groups of obstacle heights were set to simulate pavement damage.The explicit dynamic analysis program was used to simulate vehicle-bridge coupling vibration and extract the forces of vehicles on the steel bridge deck slabs at different lanes,speeds,and obstacle heights.The crack propagation life of the welded toe at the roof was obtained by applying them to a local steel bridge deck slab model.The results show that:①The impact effect of vehicles on the bridge will accelerate the fatigue failure of the steel bridge deck slabs under pavement damage.Driving on normal pavement does not lead to crack propagation of the welded toe at the roof,while the crack propagation life exists under pavement damage;②The crack propagation life of the welded toe at the roof in the same lane decreases with the increase in vehicle speed and decreases first and then increases with the increase in obstacle height;③At the speed of 80 km/h in lane 3,the initial obstacle height at crack propagation of welded toe at the roof exists at 80 mm,and the most unfavorable obstacle height is 100 mm,while at the obstacle height of 60 mm,the initial speed at crack propagation of welded toe at the roof exists at 90 km/h.

关 键 词：车-桥耦合振动 冲击效应 钢桥面板 裂纹扩展 疲劳寿命 

分 类 号：U441[建筑科学—桥梁与隧道工程]