Research On Dynamic And Stability For Long Spans And High-Piers Continuous Rigid-Framed Bridge

Recently, with rapid development of highway construction, the bridge structural style becomes diversification, the span of bridge becomes longer and longer , the pier is higher and higher, box beam wall is thinner and thinner, so the structure is more and more flexible, therefore,the dynamic and stability of bridge become extremely prominent; especially as the high-piers with long span bridge,stability and strength have equal importance,so there are still many new problems to be studied in dynamic and stability of the long span bridge.Hubei Hurong national road of mashuihe bridge(span 110+3x200+110 meter PC continuous rigid-framed bridge) is made up of the left and the right bridge, the left bridge have six piers, 4 main piers respectively the height is 39 meter, 100 meter, 139 meter, 133 meter, also the right bridge 4 main piers respectively the height is 51 meter, 112 meter, 142 meter, 135 meter, the highest pier in the mashuihe bridge is 142 meter,it is higher piers in the same type bridges, so dynamic and stability for bridge are particularly prominent. the paper take the right bridge as the research object,by means of setting up the finite element calculate model, researching dynamic and stability question of the bridge,At first,this paper has been commented to current situation and existing problem in bridge studied at present, and set up three-dimensional finite element calculate model according to actual size structure of the bridge, using finite element software ANSYS carry on static and dynamic analysis to the bridge,the paper mainly analysis dynamic performance of the right bridge under the biggest cantilever state and running state, at the same time, calculate strength and rigidity of 6# T structure under the wind load and other function load,the result indicated 6# T structure take on suffice strength and rigidity.but displacement is big, it showed the wind load has the obvious adverse effect to 6# T structure at the biggest cantilever state,therefore, when the biggest cantilever state construction, we should take essential windproof and aseismatic measure, in order to avoid wind load has disadvantage influence to the structure.simultaneously the paper also analysis bridge running state stability, analysis stability of the bridge structure under most disadvantageous load, the stability is enough, in order to analyze the structure of the bridge within designed working lives, the structure should not happen stimulating scattered vibration by oneself of destroying, or under designing the wind load and other function load, the structure should have good strength and rigidity stipulated, and it can not take place static instability . the structure non- destructive wind cause the amplitude of vibrant should ensure the safety of traffic, structure the fatigue comfortable. This data provide the digital maintains methods for the structure of bridge in the future .