Study On The Key Problem Of Deck Type Prestressed Concrete Arch-Beam Bridge

The birth of Arch-Beam Bridge gives full play to the advantages of the mechanical aspects in the arch and beam, which presents a good, stable mechanical properties, economic indicators and beautiful appearance. And because of the light structure, controllable external horizontal thrust, especially the appearance of prestressed concrete Arch-Beam Bridge system. After that, the applicability of all kinds of arch bridge in soft soil foundation is more extensive. Arch-Beam Bridge gets the favour of bridge designer, which is widely used in practical engineering.This paper studies from the following four aspects on key issues of deck type prestressed concrete Arch-Beam Bridge system.(1) Establish space finite element model to Yingbin bridge as the background, research deck type prestressed concrete Arch-Beam Bridge on reasonable bridge state, obtain optimization results of prestressed tension and reasonable internal force of bridge.(2) Compare the mechanical properties of different structures in deck type prestressed concrete Arch-Beam Bridge. By modeling analysis, compare the internal force and deflection of main arch, main beam and bridge pier under the condition of vehicle load, temperature load, concrete shrinkage and creep, foundation uneven settlement. Analysis the difference and similarities. Find out the law by changing the span ratio, stiffness ratio of arch, and put forward the corresponding suggestions.(3) Through modelling the actual case of Gaoxingsilu road, simulating different condition of the construction sequence, Designing he internal force and deflection of the construction, to find the most reasonable construction sequence.(4) Based on the background of Gaoxinsilu road, considering the interaction of pile and soil. Analysis the dynamic characteristics and seismic response of the bridge, And compare the internal force and seismic performance of the two kinds of structure under earthquake action.Through the calculation and analysis, it is concluded that the reasonable state of the bridge is mainly considered as the optimization of the prestress. Not only to meet the basic needs of the imbalance thrust as small as possible, but also to meet the needs of the upper structure; two kinds of structural system optimal discriminant results are different under different loads, so according to the specific circumstances to select the appropriate arch beam connection at design time. The ratio of rise to span and the stiffness ratio of arch beam, andconstruction sequence have a large influence on the internal force of the structure, so choosing the reasonable design parameters and construction sequence at design time. The seismic performance of the two structures is different under the earthquake action, the lower part of the consolidation system is stressed, and the upper structure of the articulated system is stressed. Therefore,analyze in accordance with the structural arrangement in seismic design.