摘要
为有效分析列车引起的桥梁应力响应,对车桥耦合动力分析法、静力影响线法及移动集中力法3种列车作用下的桥梁应力响应计算方法进行了深入的比较研究.采用3种方法对2座铁路典型混凝土简支T梁和下承式钢桁梁桥进行应力响应分析,基于桥梁现场实测数据对比分析了不同方法的计算结果,研究了列车速度和桥梁横向振动对应力结果的影响.结果表明:车速对桥梁应力响应有显著的影响,共振发生时3种方法的计算结果相差较大,消振条件下三者区别减小;由列车水平方向作用力引起的桥梁或构件横向振动对应力响应的贡献不容忽视;车桥耦合动力分析法能够更为真实地反映桥梁构件的动应力历程,在高速、桥梁横向刚度较低或列车局部加载的情况下尤其具有计算精度优势.研究结果可为3种不同计算方法的工程应用提供参考.
To effectively analyze the train-induced stress responses of bridges,a comparative study on three computation methods for the stress responses of bridges under train loads,namely,the trainbridge coupled vibration analysis method,the static influence line method,and the moving concentrated load method is performed.The stress responses of two typical railway bridges,a concrete simply-supported T beam bridge and a steel through truss girder bridge,are analyzed through the three methods.The computation results from various methods are compared and analyzed by using the data measured at the bridge sites.The influences of the train speed and the bridge lateral vibration on the stress results are investigated.The results show that the train speed significantly affects the bridge stress responses.Considerable differences are found in the computation results obtained from the three methods when the vibration resonance occurs,while the differences are reduced under the condition of the vibration cancellation.The contributions of the lateral vibrations of the bridges or the components induced by the horizontal train loading to the stress responses cannot be neglected.The train-bridge coupled vibration analysis method can more truly reflect the dynamic stress histories,and especially has the advantages of calculation accuracy in the cases of high speed,low lateral bridge stiffness,or local train loading.The results can provide references for the engineering applications of three different computation methods.
作者
李慧乐
夏禾
宗周红
Li Huile;Xia He;Zong Zhouhong(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University , Nanjing 210096 , China;School of Civil Engineering, Beijing Jiaotong University ,Beijing 100044, China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第3期576-583,共8页
Journal of Southeast University：Natural Science Edition
基金
国家重点基础研究发展计划(973计划)资助项目(2013CB036203)
"十二五"国家科技支撑计划资助项目(2014BAK11B04)
国家自然科学基金资助项目(51528802)
关键词
应力分析
车桥耦合振动
现场测试
车速
横向振动
stress analysis
train-bridge coupled vibration
field test
train speed
lateral vibration
