Study On Performance Optimization Of Lock-up Device In Long Span Concrete Bridge

Long span concrete continuous beam bridge is an important part of traffic hub. Thequality of upper structure of large span concrete continuous beam bridge are large. Under theaction of longitudinal earthquake load will produce great inertia force, the friction generatedby the activities of pier to cancel the inertial force little, most of inertia force offset by thefixed pier. The Lock-up device as a correction device of earthquake response, it can changethe structure of force transmission system effectively during the earthquake. In this thesis, a5span continuous beam bridge as the project background. Research contents are as follows:How a degree of longitudinal seismic performance When install the Lock-up device;Influence of Change the position of the Lock-up device; Combined application of Lock-updevice and the viscous damper.This paper mainly contains the following contents:1）Make a comprehensive analysis and a development situation about the Lock-up deviceused in bridge seismic research and development. To understand the main mechanism ofLock-up device and parameters of Lock-up device (such as a device for maximum stroke,locking speed, ultimate bearing capacity etc.).2) By using the large finite element software ANSYS analyses the improvement degreeof continuous bridge seismic isolation performance. The5span continuous beam bridgeseismic analysis by choosing different locking speed V0. Study on the sensitivity of the bridgeon the locking speed.3) For multi span continuous beam bridge, Considering the same high pier and thedifferent height of piers case, analyses the influence of Lock-up device layout on seismicperformance of bridge, Find out the layout scheme of Lock-up device is reasonable.4) Lock-up device is also called speed locking device, it can be very good to improve theoverall seismic performance. But it is almost no energy dissipation, so the search for thecombined application of Lock-up device and other reduction, vibration isolation device.The results show that: Lock-up device can change the structure of continuous girder bridge in the earthquake, to improve the overall seismic performance of bridge structures, fulluse of "surplus" seismic capacity of activities pier. Lock-up device locking speed v0is greater,leading to the bottom of the pier force trends more obvious; because the Lock-up devicelocking state is not synchronized; The Lock-up device can effectively combined with viscousdamper, getting the better effect of shock absorption better.