Influence Study On Reinforced Concrete Arch Bridge's Seismic Dynamic Response By Composite Concrete

Compared with ordinary concrete,high strength lightweight aggregate concrete,while maintaining high strength basis,can reduce the concrete weight of more than 20%,which is a great advantage for the long-span bridge;the lightweight aggregate of lightweight aggregate concrete can be made of industrial waste and garbage burning ash,which has very important significance in environmental protection.Reinforced concrete strength sexual frame arch bridge in the modern long-span arch bridge occupies a very important position,this paper aims to study the application of lightweight aggregate concrete in Reinforced concrete strength sexual frame arch bridge.For concrete strength framework filled steel tubular arch bridge,Steel pipe is usually used as a steel skeleton,The outer compressive stress of the concrete should be much lowerthan the pressure of concrete in the steel pipe,so we can use ordinary concrete insidethe steel tube and lightweight aggregate concrete outside.In this way,we can not only produce the advantages thatthe ordinary aggregate has elastic concretemodulus,shrinkage and creepsmall,convenient pipe pumping construction,but we can also produce those light weightconcrete,heat insulation and goodseismic advantages.Long-span bridges of Important traffic line,if under the destroy of a strong earthquake,blocking traffic will seriously weaken the post disaster emergency response capability,so the seismic performance of the bridge is very important.A study on remarkable features of composite aggregate concrete arch bridge compared with ordinary concrete arch bridge under earthquakeis very necessary.In this paper,a Reinforced concrete arch bridge with three concrete materials is established,which there are ordinary aggregate concrete,lightweight aggregate concrete and composite concrete.Three kinds of schemes in structure vibration characteristics are established with finite element model.Researches are done about the similarities and differences and the reason of it between those three concretes under vibration character analysis,response spectrum analysis and the dynamic time history analysis.Conclusions are made in this paper in order to provide guidance and reference for composite concrete's application in concrete filled steel tubular arch bridge with rigid frame.