朔黄铁路超低高度梁辅助钢梁法加固试验  

Reinforcement Test on Super Low-height Girder by Auxiliary Steel Beam Method on Shuozhou-Huanghuagang Railway

作　　者：张福田 ZHANG Futian(Shuohuang Railway Development Co., Ltd.,Suning Hebei 062350 ,Chin)

机构地区：[1]神化集团运输管理部,北京100011

出　　处：《铁道建筑》2017年第4期40-44,共5页Railway Engineering

基　　金：国家科技支撑计划(2013BAG20B00);神华集团有限责任公司科研项目(12125F37)

摘　　要：对超低高度预应力混凝土梁采取辅助钢梁技术进行加固,并在加固前后及加固过程中进行相关动载试验。加固过程中监测试验保证了加固施工安全,验证了辅助钢梁承担部分恒载。通过加固前后对比试验掌握了梁体受力性能:加固后的梁体跨中竖向挠度、下缘混凝土应变比加固前有明显的降低,竖向挠度在运营列车作用下降低24.9%~33.4%,试验列车作用下降低24.5%;下缘混凝土应变在运营列车作用下降低25.9%~33.1%,试验列车作用下降低23.4%。增设辅助钢梁后梁体的竖向刚度明显提高,辅助钢梁与原混凝土梁体共同作用性能良好。通过系列动载试验掌握了在30 t轴重条件下梁体承载力的安全储备量,为大轴重条件下辅助钢梁加固技术的推广应用奠定了基础。The super low-height prestressed concrete girder was strengthened with the technology of auxiliary steel girder. The corresponding dynamic tests were carried out before, during and after reinforcement. As a result, monitoring tests during reinforcement process ensured the construction safety and verified the auxiliary steel girder could bear partial load. The force performance of beam was grasped by the contrast test before and after reinforcement. After reinforcement, the vertical deflection of the beam in the middle and the concrete strain of the lower edge were obviously reduced. The vertical deflection decreased by 24.9% - 33.4% under the action of the operating train and it decreased by 24.5 % under the action of the test train. The lower edge of the concrete strain decreased by 25.9% - 33.1% under the action of the operating train and it decreased by 23.4% under the test train. The vertical stiffness of the beam was obviously improved after adding the auxiliary steel girder, and the auxiliary steel girder had good performance with the original concrete beam. Through a series of dynamic load test, the safety margin of bearing capacity of beam was finally mastered under the 30 t axle load. The test results laid a solid foundation for the application of the auxiliary steel girder reinforcement technology under heavy haul vehicles.

关 键 词：铁路桥梁 加固技术 试验研究 超低高度梁 重载运输 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]