Table Test Study On Seismic Simulation Of S-shaped Curve Bridge

With the rapid development of China’s road traffic,a lot of curve bridges have beenbuilt. With its beautiful shape and integration with the environment,it has become abeautiful scenery of nature.The shape of the curve bridge tortuous, the force complex and the bending-torsioncoupling effectis remarkable, occupied a large proportion in the previous earthquakedamage of bridge. So studying the aseismic mechanism, avoiding or reducing theearthquake damage and destruction has become one of the focuses of the bridge seismicresearchers in recent years. In this paper, combined with the S-shaped curve bridge, thefollowing research works are conducted.(1) Phenomenon of damage to bridges at home and abroad are classified research,earthquake damage of several devastating earthquake at home and abroad are analyzedin detail, seismic research status of the curved bridge are discussed on this basis, theresearch achievements and existing problems are summarized.(2) Seismic analysis theory of curved bridge are discussed and analyzed, thedynamic time history analysis method and multi-point seismic response analysis methodare studied on focus, lay the theoretical foundation for the smooth progress of theshaking table tests.(3) A S-shaped curve bridge are carefully designed, the bridge model with thereduced scale ratio of1/20are made. Process of design, production and maintenance ofthe model bridge are discussed in detail. The seismic simulation shaking table test areconducted.(4) The vibration transfer system has been designed and single vibration tableismodified to realize multi-point excitation for the model of the bridge.The problem ofsimulating more incentive by using single vibration table is solved preliminary. (5) Through the detailed analysis to the dynamic characteristics, acceleration timehistory curve, displacement time history curve and strain time history curve of themodel bridge, the seismic performance of the S-shape curved bridge is researched.(6) Through analyzing the function of the stopperand anti-collision facilities,finding that we should pay more attention to passive energy dissipation measures andmethods as well as avoid simply adding strength to resist earthquakefor curved bridgeseismic. Anti-drop-beam device of the curved bridge should not only have sufficientdeformation and energy dissipation capacity, but also should have enough stiffness,strictly preventing excessive displacement of the beam lead to the pier eccentric force istoo large and unstable.(7) The concept "beam floating seismic system" isproposed and applied to themodel bridge test.By analyzing the strain data of piers reinforced we found that themodel bridge reinforced still not yield under strong earthquake, which shows that "beamfloating seismic system" is very beneficial to improve the seismic performance andseismic capacity of the curved bridge.