Study On The Collapse-proof Systems For Seismic Design Of Girder Bridges

In recent decades, frequent earthquakes caused great damage to structures,especially to bridges,therefore taking reasonable protection of bridges to againstearthquakes becomes necessary.Generally, the damage forms of bridge include: damageof the upper structure, damage of support connections, unseating damage to the bridgegirders, substructure and foundation damage, the most common damage is the unseatingdamage to the bridge girders. In the earthquake, collapse-proof systems is the ultimateprotective measures to prevent the unseating of upper bridge girder. Studies in this paperinclude: research of domestic and foreign regulations of collapse-proof systems, choicea appropriate collapse-proof systems, and analysis the seismic response of the bridgewith collapse-proof systems.In this paper, chose a non-regular seven span girders bridge, using three seismicwaves under different site conditions,then compared the seismic response of the bridgethrough time history analysis; compared the results of three different process conditionsunder elastic buffer materials obtained transverse stopper under earthquake magnitudeof the force,and got the stress of link stopper through the responses in time historyanalysis, found the link stopper has a good effect to limits the relative displacementbetween the girder and pier, it can significantly reduce the stopper force when set thebuffer material between the main beam and lateral stopper; using different stiffness ofthe spring damping element simulate the longitudinal link stopper and analysis theseismic response of the bridge with collapse-proof system through time history analysis.The research results of the collapse-proof system design has a certain referencevalue to engineering applications.