Application Of Partially Prestressed Concrete Beams In The Multi-tower Cable-stayed Bridge With High Piers

Cable-stayed bridge after more than half a century of development has been rapid popularization, the cable-stayed bridge concrete girders are usually in the prestressed design, using high grade concrete, partial prestressed concrete application research is rarely in the cable-stayed bridge.Taking chenzhou ChiShi RuChen high speed super major bridge as the engineering background, using MIDAS CIVIL and BDCMS model, Analysis of partial prestressed concrete structure of the ultimate bearing capacity, crack resistance and lasting condition of stress, class B PPC components such as mechanical performance, the crack width study demonstrates the feasibility of partially prestressed concrete beam in tower cable-stayed bridge.Late research results show that the prestressed steel beam beam can be appropriately reduced, and reduce concrete compressive stress state is reduced, concrete grade can be appropriately reduced, also provide certain reference for future design and construction.The main contents of this paper include:(1) Detailed description of the historical development, characteristics and trends cable-stayed bridge; introduces the development history of prestressed concrete structures, and partially prestressed concrete structure advantages and disadvantages of a detailed summary.(2) This paper expounds the cable-stayed bridge static analysis theory, the dead load internal force calculation method of cable-stayed bridge are summarized in detail; Introduced the crack width calculation theory and calculation method.(3) To Ru Chen speed-Akaishi Bridge engineering background, the whole prestressed concrete structures for static analysis. Static analysis using MIDAS and Changsha University of BDCMS established two finite element models for simulation analysis, the main analysis of the whole design of cable-stayed bridge prestressed overall force performance.(4) Similarly to Akaishi Bridge engineering background, the use of partially prestressed model and compare the overall performance of the whole structure of prestressed model analysis, the application of the multi-tower cable-stayed bridge with high piers partially prestressed concrete beams to do a feasibility study and draw some relevant conclusions.(5) By comparing the model analysis, the final conclusions provide some reference for the design and construction; and some suggestions for future research.