车桥耦合下D型施工便梁结构安全性研究  

Study on structural safety of D-type temporary beam under vehicle-bridge coupling

作　　者：曹振 林文旭 万思宇 刘昭 张超超 雷斌 CAO Zhen;LIN Wenxu;WAN Siyu;LIU Zhao;ZHANG Chaochao;LEI Bin(School of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an Shaanxi 710055,China;Ankang Housing and Urban-rural Development Bureau,Ankang Shaanxi 725029,China;Ankang Highway Administration,Ankang Shaanxi 725099,China;Shaanxi Construction Engineering Group Corporation Limited No.12 Group,Ankang Shaanxi 725029,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]安康市住房和城乡建设局,陕西安康725029 [3]安康公路管理局,陕西安康725099 [4]陕西建工第十二建设集团有限公司,陕西安康725029

出　　处：《中国安全科学学报》2022年第S01期96-102,共7页China Safety Science Journal

基　　金：陕西省建设领域科技计划项目(2020-S59)。

摘　　要：为保障施工安全和列车行车安全,以某市政隧道下穿13股道繁忙铁路工程为例,建立安全监测系统获取实测数据,再构建车桥耦合动力学模型。通过实测数据和模拟数据研究多种工况耦合下的便梁结构安全和列车行车安全情况。结果表明:车桥耦合模型具有一定的可靠性,轨道不平顺对结构安全性以及行车安全性影响较大,轮重减载率随车速的增加而增大;列车通过曲线段时腹板应力增大,便梁结构稳定性降低,轮重减载率增大;温度附加变形对结构安全性的影响程度较小,但温度应力不容忽视。在施工期间进行轨道平顺性测量,以适当车速通过D型施工便梁保证行车安全性,按要求布置斜杆及限位装置以保证结构稳定性。In order to ensure construction safety and driving safety,taking a municipal tunnel passing through a busy railway project with 13 tracks as an example,a safety monitoring system was established to obtain measured data,and then a vehicle-bridge coupling dynamics model was constructed.The safety of the beam and train under the various working conditions were studied through the measured data and simulated data.The results show that the vehicle-bridge coupling model has certain reliability,and the track irregularity has a great impact on the safety of the beam and the train.The wheel load reduction rate increases with the increase of the vehicle speed.The web stress increases,the stability of the beam decreases,and the load reduction rate of the wheel increases when the train passes through the curve.The influence of the additional deformation of temperature on the structure safety is small,but the temperature stress cannot be ignored.During the construction period,the track smoothness is measured,and the D-type beam is passed at an appropriate speed to ensure driving safety.The inclined rods and limit devices are arranged to ensure structural stability.

关 键 词：车桥耦合 D型施工便梁 结构安全 安全监测 行车安全 

分 类 号：X941[环境科学与工程—安全科学]