车流作用下大跨桥梁-伸缩缝一体仿真方法及动力分析  

Integrated Simulation Method and Dynamic Analysis of Long Span Bridge-expansion Joint under Traffic Flow

作　　者：刘焕举 刘宁[2] 史赛威 李鹏智 LIU Huanju;LIU Ning;SHI Saiwei;LI Pengzhi(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China;Key Laboratory of Transport Industry of Bridge Detection Reinforcement Technology(Chang’an University),Xi’an 710064,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]旧桥检测与加固技术交通运输行业重点实验室(长安大学),陕西西安710064

出　　处：《湖南大学学报(自然科学版)》2025年第1期149-159,共11页Journal of Hunan University:Natural Sciences

基　　金：长安大学中央高校基本科研业务费专项资金资助(JQJJ202408);河北省高等学校科学技术研究项目-青年拔尖人才项目(BJ2020012)。

摘　　要：为实现车流过桥时的伸缩缝动力分析,针对桥梁-伸缩缝体系中主梁与伸缩缝尺寸相差悬殊、伸缩缝构造复杂、常规建模无法兼顾细部分析和计算效率的问题,提出桥-缝一体“十”字建模思路,建立了车-桥-缝分析系统,探究车流动态因素对伸缩缝动力响应的影响.首先,在厘清伸缩缝内部结构和构件运动关联的基础上,提出桥梁单元纵向划分、伸缩缝单元横向划分及梁端-伸缩缝多点约束有机连接的桥-缝一体“十”字建模思路,并建立背景桥梁的桥-缝一体有限元模型;其次,移动车辆荷载化并通过程序调用、编制衔接程序,实现车-桥-缝分析程序的贯通;最后,基于交通荷载调查数据,构建典型车流荷载工况,探究车重、车速、车辆分布等车流动态因素对车-缝结构的动态响应影响.结果表明:1)基于“十”字建模思路建立的桥-缝一体有限元模型,既满足计算效率又兼顾伸缩缝的细部构件.2)斜拉桥主梁跨中竖向位移与桥上移动车辆的车重有显著的正相关性,而与车速的相关性较弱;车列的车间距由50m减小到30 m,主梁跨中竖向位移极值增大约34%,桥梁所受车辆荷载越集中,主梁跨中竖向位移越大.3)伸缩缝从梁端到固定端的中梁累计滑移行程逐渐减小;单车工况下,车速、车重与伸缩缝纵向位移均呈正相关关系;车列工况时,伸缩缝的纵向位移最大值与车间距存在负相关性;车辆制动对伸缩缝动力响应的影响非常显著,对应伸缩缝1#中梁纵向位移响应是正常跑车工况的3.97倍.To realize the dynamic analysis of expansion joints under traffic flows across bridges,aiming at the large size difference between the main beam and the expansion joint in the bridge-expansion joint system,the complex structure of the expansion joint,and the problem that the conventional modeling approach falls short in balancing detailed analysis with calculation efficiency,a“cross”modeling concept of bridge-joint integration was proposed and a vehicle bridge joint analysis system was established to investigate the influence of dynamic factors of traffic flow on the dynamic response of expansion joints.Firstly,on the basis of clarifying the internal structure of the expansion joint and the movement correlation of the component,the longitudinal division of the bridge element,transverse division of the expansion joint element and multi-point constraint organic connection of the beam expansion joint were proposed.Secondly,a vehicle-bridge-joint analysis program was connected through the program call and preparation of the connection program.Finally,based on the traffic load survey data,the typical traffic flow load conditions were constructed,and the influence of traffic flow dynamic factors such as vehicle weight,speed,and vehicle distribution on the dynamic response of car-joint structure was explored.The results show that:1)The bridge joint integrated finite element model established based on the“cross”modeling concept not only meets the computational efficiency but also takes into account the detailed components of the expansion joint.2)There is a significant positive correlation between the vertical displacement of the main beam at the midspan of a cable-stayed bridge and the weight of moving vehicles on the bridge,while the correlation with vehicle speed is weak.The spacing between vehicles in the train decreased from 50 meters to 30 meters,and the maximum vertical displacement at the midspan of the main beam increased by about 34%.The more concentrated the vehicle load on the bridge,the greater the v

关 键 词：桥梁工程 模数式伸缩缝 车-桥-缝系统 “十”字建模 动力分析 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]