不同工况下桥梁无缝伸缩装置力学特性有限元分析  

Finite Element Analysis of Mechanical Characteristics of SeamlessBridge Expansion Devices Under Different Working Conditions

作　　者：范磊 王刚 甄治国 郝占雷 张辉 FAN Lei;WANG Gang;ZHEN Zhiguo;HAO Zhanlei;ZHANG Hui(Xuzhou Highway Development Center(Xuzhou Major Transportation Project Construction Center),Xuzhou 221005,China;No.4 Engineering Corporation Limited of CR20G,Qingdao 266061,China;Jiangsu Sinoroad Engineering Technology Research Institute Co.,Ltd.,Nanjing 211806,China)

机构地区：[1]徐州市公路事业发展中心(徐州市交通重大工程建设中心),徐州221005 [2]中铁二十局集团有限公司第四工程工程有限公司,青岛266061 [3]江苏中路工程技术研究院有限公司,南京211806

出　　处：《交通科技》2025年第1期60-65,共6页Transportation Science & Technology

摘　　要：为探讨车辆荷载(超载、制动)和温度荷载对无缝伸缩缝受力特性的影响,为无缝伸缩缝的设计及优化提供理论依据,采用有限元法建立桥梁无缝伸缩缝系统的数值模型,考虑标准荷载、超载条件、温度变化及紧急制动产生的水平荷载等多种工况,深入分析伸缩缝各组成材料的受力情况及其相互作用。结果表明,在超载200%时,超韧弹性体的竖向应力最大值为1.21 MPa,位移最大为0.63 mm,结构更易发生损伤。在高温条件下,竖向位移达到5.65 mm,温度变化对变形影响显著。稳定杆设置后,竖向位移减少30%,由温度引起的变形得到有效控制。在紧急制动工况下,水平荷载使得超韧弹性体下表面剪切应力增至0.28 MPa,是仅受竖向荷载时的2倍,设置角钢有效降低了超韧弹性体与外侧角钢界面间的拉应力。The effects of vehicle loads,such as overloading and braking,and temperature loads on the mechanical characteristics of seamless expansion-contraction joints are investigated to provide theoretical basis for the design and optimization of seamless expansion-contraction joints.The finite element method is used to establish the numerical model of the seamless expansion-contraction joint system of the bridge.Considering various working conditions such as the standard load,overload condition,temperature change and horizontal load caused by emergency braking,the stress and interaction of the components of the expansion-contraction joint are analyzed.The results show that the maximum vertical stress of the super-tough elastomer is 1.21 MPa and the maximum displacement is 0.63 mm under 200%overload,making the structure more prone to damage.Under high temperature conditions,the vertical displacement reaches 5.65 mm,and the temperature change has a significant effect on the deformation.After the stabilizer bar is set,the vertical displacement is reduced by 30%,and the deformation caused by temperature is effectively controlled.Under emergency braking conditions,the horizontal load increases the shear stress on the lower surface of the super-tough elastomer to 0.28 MPa,which is twice as high as that under vertical load only.The setting of angle steel effectively reduces the tensile stress between the interface of the super-tough elastomer and the outer angle steel.

关 键 词：桥梁无缝伸缩装置 有限元模型 车辆荷载 温度荷载 力学特性 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]