Computation Analysis In Translational-torsional Coupling Vibration Of Ground-foundation-eccentric Structure Caused By High-speed Train

In recent years, with the rapidly developing of high-speed rail transportation industry,train speed is rising gradually, which brings a great convenience to people’s traveling.Meanwhile, people’s living quality is influenced by the problem of environment vibrationwhich is caused by high-speed train. Particularly in the development of society, man pursues ahigher living standard. Building is no longer a simple structure which just basically meetspeople’s living, but a diverse and complicated one, which results the eccentric structure.While vibration caused by high-speed train affects more seriously in eccentric structure. Atpresent research on translational-torsional coupling vibration of eccentric structure caused byhigh-speed train is relatively rare. Thus new research in this field becomes very necessary andsignificant.This dissertation is a part of the national natural science foundation subject “Research ontranslational-torsional coupling vibration of ground-foundation-eccentric structure interactionsystem caused by high-speed train”(the code number:50968007), as well as the youngscientists’(the star of Jinggang) training program subject in Jiangxi province (the codenumber:2010DQ01800). The translational-torsional coupling vibration ofground-foundation-single eccentric structure interaction system and ground-foundation-twoeccentric structure interaction system caused by high-speed train were researched into.Track-ground-foundation-eccentric structure three-dimensional numerical analysis model wasbuilt based on finite element analysis software ANSYS in this paper. The influencing rules ofparameters such as translational-torsional ratio, train speed, eccentricity and eccentric floorposition on translational-torsional coupling vibration of eccentric structure were analyzed.According to those work above, the main results were gained as follows.(1) The influence of translational-torsional ratio on ground-foundation-single eccentricstructure. The main targets of study were displacement and acceleration. It concluded that thedisplacement and acceleration of X direction (horizontal and perpendicular to the track direction) as well as Z direction (horizontal and parallel to the track direction) decreased withthe translational-torsional ratio’s increasing. And they got the maximum when the ratio valuearound1.0. The displacement and acceleration of Y direction (vertical direction) varied littlewith the translational-torsional ratio’s changing.(2) The influence of train speed on ground-foundation-single eccentric structure.Different train speed at60m/s,70m/s and80m/s were chose while the translational-torsionalratio did not change. The main targets of study were displacement and acceleration. Itconcluded that the faster of the train speed, the greater value of the displacement andacceleration, that is, vibration was more obviously.(3) The influence of eccentricity on ground-foundation-two eccentric structure. The maintargets of study were displacement, torsional displacement and acceleration. It concluded thatthe displacement of X direction and Z direction decreased with the eccentricity’sincreasing while the displacement of Y direction increased with its increasing. Torsionaldisplacement of bottom floor and top floor varied the same with the eccentricity. Theacceleration of X direction decreased with the eccentricity’s increasing, the acceleration ofY direction increased with the eccentricity’s increasing.(4) The influence of eccentric floor position on ground-foundation-two eccentricstructure. The main targets of study were bottom eccentricity, uniform eccentricity and topeccentricity. It concluded that eccentric floor position had a small influence to bottomdisplacement of X, Y, Z direction, also to top displacement of X, Y direction. But ithad a big influence to top displacement of Z direction. The influence of uniformeccentricity and top eccentricity on torsional displacement was basically consistent.