Effect Of Heavy-haul Train Vibration On Houses And Research Of Vibration Reduction

Transportation promotes the rapid development of the world economy,nowadays heavy-duty train transportation has become the development direction of freight transportation.It also brings a variety of environmental problems,especially the impact of heavy haul train vibration on the surrounding environment is more prominent,affecting people's work,life and rest.Heavy-duty train transportation in China is mainly through the rural areas,the vibration response caused to the along houses and the influence to the human body comfort cannot be ignored.Study on the vibration problem caused by the heavy-duty train which has the characteristic of large load and long duration is deficient.Therefore,it is necessary to study the dynamic response analysis and vibration control of heavy-duty trains caused along the houses.This paper bases on the background of Shuohuang heavy-duty train line,taking dynamic characteristics analysis and comfort evaluation and vibration control of the house vibration caused by heavy-duty train.This project belongs to the National Natural Science Foundation of “study on the impact assessment and vibration of structures along the railway line”(project number: 51378500).The research contents and results are as follows:(1)A brief introduction to the human body comfort evaluation standards,and using direct method,filter method and the spectral density method evaluation methods,such as calculation and analysis of vibration acceleration measured results,on the basis of study,the author analysis the similarities and differences among all kinds of evaluation method of vibration,and provides reference for the vibration environment impact assessment.(2)Shuohuang heavy-duty lines go through Shangyuan village,Shenshan village and hooded sheep hot pot city of Yuanping,Shanxi province.The author uses measured vibration data to commit time-history analysis,spectrum analysis and comfort evaluation,and the comparative analysis of the similarities and differences of the vibration characteristics under various conditions.The results show that the vibration of the houses under various conditions is mainly for low frequency vibration,and vertical vibration intensity increases with the number of layers,horizontal vibration is also required attention;the house vibration strength of Shangyuan villagers is over the national standard limit value,and need to take appropriate vibration damping measures.(3)Using software SAP2000 to establish two-story masonry structure houses model and inputting the measured vibration acceleration time-history of dynamic response analysis for different site conditions of masonry structure,and vibration acceleration are calculated,then we can get the vibration acceleration level to evaluate indoor human degree of comfort.Analysis shows that the masonry structure vibration is mainly in 5~22 Hz low-frequency vibration.The vibration acceleration level is over the national standard.(4)For measuring points of masonry structure models which are over national standard limit value,we can adjust the tuned mass damper(TMD)system parameters to control the vibration and analysis under different conditions,analysis the vibration response characteristics of masonry structure before and after the vibration,evaluating whether it meets the national standard after vibration.The results show that the TMD system has good control effect for vibration of each layer of masonry structure;the frequency of vertical vibration intensity are controlled in the scope of the national standard provisions,meeting the human comfort requirements.