基于精细有限元仿真的装配式梁桥铺装层研究  

Research on fabricated beam bridge paving layer based on fine finite element simulation

作　　者：周慧娟 淡丹辉 许钊源[2] 赵锐 ZHOU Huijuan;DAN Danhui;XU Zhaoyuan;ZHAO Rui(College of Civil and Architectural Engineering,Xinjiang University,Urumqi 830017,China;State Key Laboratory for Health and Safety of Bridge Structures,Wuhan 430034,China;Department of Bridge Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830017 [2]桥梁结构健康与安全国家重点实验室,湖北武汉430034 [3]同济大学土木工程学院桥梁工程系,上海200092

出　　处：《现代电子技术》2023年第5期96-103,共8页Modern Electronics Technique

基　　金：国家自然科学基金项目(51878490)。

摘　　要：随着交通流荷载的不断增大,铺装层的受力也逐渐被考虑在桥梁整体受力中。为了解铺装层在装配式梁桥体系中的受力情况,运用有限元仿真方法,利用武汉长丰桥精细的有限元模型进行仿真,得到30 t车辆荷载下基于不同厚度的C50铺装层及8 cm厚UHPC铺装层带来的分散效应。利用上海同济路桥连续三跨桥梁的长期监测数据提出基于皮尔逊系数的纵向协同指标,并利用长丰桥模型仿真得到铺装层的纵向协同作用完全退化时与桥梁健康处于健康状态下,跨中应力及挠度的倍数关系。桥梁连续段采用弹簧进行连接,其刚度值运用结构力学中积分法得到。结果发现:30 t车辆荷载作用下,普通C50混凝土铺装层每增加2 cm平均降低梁底6.27%的挠度、3.02%的应力;8 cm的UHPC作用效果接近11 cm C50铺装层效果;当桥面连续退化成简支后,跨中梁底应力增加接近1.5倍,挠度增加接近1.74倍;利用弹簧连接两根梁时,弹簧的刚度随着跨度的增加趋于稳定,为45EI (13L)。With the increasing traffic flow load,the stress of paving layer is gradually considered in the overall stress of the bridge. In order to understand the stress of paving layer in the fabricated beam bridge system,the simulation of fine finite element model of Wuhan Changfeng Bridge is conducted by means of the finite element method to obtain the dispersion effect of C50paving layer with different thickness and UHPC paving layer with 8 cm thickness under 30 t vehicle load. The longitudinal synergy index based on Pearson coefficient is proposed by using the long-term monitoring data of three consecutive bridges of Tongji Road and Bridge in Shanghai,and the multiple relationship between the mid-span stress and deflection is obtained by using the Changfeng Bridge model simulation when the longitudinal synergy of the pavement is completely degraded and the bridge is healthy. The continuous section of the bridge is connected by springs,and its stiffness value is obtained by means of the integral method in structural mechanics. The results show that under the action of 30 t vehicle load,the average deflection and stress of the beam bottom are reduced by 6.27% and 3.02% for every 2 cm increase of the ordinary C50 concrete pavement,and the effect of 8 cm UHPC is close to that of 11 cm C50 pavement. When the bridge deck is continuously degenerated into simply supported,the stress at the bottom of the mid-span beam can increase by nearly 1.5 times,and the deflection can increase by nearly 1.74 times;When two beams are connected by springs,the spring stiffness tends to be stable with the increase of span,which is 45EI(13L).

关 键 词：装配式梁桥 有限元仿真 铺装层 纵向协同 受力分析 UHPC材料 桥面连续 桥梁健康监测 

分 类 号：TN919-34[电子电信—通信与信息系统]