超载现象对连续梁桥跨中截面的影响  

Effect of Over-loading on Mid-Span Section of Continuous Girder Bridge

作　　者：吴隆 李海涛[1] WU Long;LI Haitao(Civil Engineering College,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《成都工业学院学报》2020年第2期54-57,共4页Journal of Chengdu Technological University

摘　　要：为满足经济需求采用的卡车超载货物运输现象已屡见不鲜,以此现象分析了卡车在超载情况下对连续梁桥跨中部位的影响。采用有限元方法对桥梁及3种不同类型卡车进行模拟,得到桥梁的自振频率及跨中位移值,同时通过数值计算的方法对数值模拟进行了检验。结果表明:随着卡车荷载的增加,其自身振动频率随着模态的上升而下降,对桥梁跨中的位移值成上升的趋势,最终可能会导致桥梁与卡车造成共振现象,同时对跨中部位造成严重的变形损伤。通过研究,桥梁在役时要严格控制过往车辆的数量及质量,并且变截面连续梁桥在设计时跨中截面刚度可适当增加。To meet the economic needs,truck overloading is common.Therefore,the effect of truck overloading on the mid-span section of continuous girder bridge was analyzed in this paper.The finite element method was used to simulate the bridge and three trucks with different loading conditions,and the natural frequencies and mid-span displacements values of the bridge were obtained.At the same time,the numerical simulation was verified by numerical calculation method.The results show that with the increase of truck load,its own vibration frequency decreases with the increase of modal,and the displacement value of the bridge mid-span position becomes an upword trend,which may eventually lead to the resonance between the bridge and the truck,and cause serious deformation damage in the middle part of the span.Through research,the number and quality of vehicles should be strictly controlled during the service of the bridge,and the stiffness of mid-span section of variable cross-section continuous girder bridge can be increased appropriately in design.

关 键 词：卡车荷载 连续梁桥 超载 振动 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]