Research On Steel-prestressed Concrete Composite Continuouse Beam Bridges Applied In Navigable Rivers In The Plain Area

For a long time, the bridges across main lines of channels, have been designed in reference to common river-crossing bridges and ignored their own personalities, which may lead to a scandalous waste of funds. As a result, study the design of fairway bridges and landscape, effectively guarantee underbridge traffic capacity, make the minimum size and save construction cost, are all of great theoretical and practical significance.As a new type of structure, steel-prestressed concrete composite continuous beam brigde has the advantage of reasonable mechanical behavior, superior performance, convenient construction and economy. However, domesic and international theoretical researchers are not enough on aspect of steel-prestressed concrete composite structure till now and there aren't respective provisions in the Chinese design specifications, so designer and constructer don't understand its structure performance, design and construct points and these aspects have a great influence on the application of this reasonable structure system. As a result, it has much realism sense to finish all right the engineering of 318 stateroad longbridge bridge, and work safely, that studying the construct of 318 stateroad longbridge bridge, analyzing and calculating this bridge's internal force in the construct and working phase, inspecting its stress in the construct phase, finding out the working state. At the same time, puts forward reasonable design advice, that will does its work to generalize steel-prestressed concrete composite continuous beam brigde in zhejiang province or in our country indeed.This article uses large-scale finite element analysis software, has established steel-prestressed concrete composite continuous beam brigde nonlinear analysis model. It analyses the internal force of this beam during the phase of construct and working and analyses of results. The result of research shows that this composite beam is in safe state during the phase of construct and working, and is feasible to promote this new type of structure in navigable rivers in the plain area. Furthermore, with the reasons of saving the building cost and increasing bridge span, steel-prestressed concrete composite continuous beam brigde has some market competitiveness.