Secondary Beam Prestressed Ultra-thin Structure Of The Application

Relied on the scientific research fund project of the Guangdong communication department :"the application research of high strength concrete in ultra-thin beam bridge",the double-prestress ultra-thin beam composite structure is presented creatively by my tutor prof.Shao Xudong in the course of studying the ultra-thin beam bridge. To testify the feasibility and suitability of this new-type prestressed concrete structure, lot of studies is made on the aspects of static performance, creep effect and dynamic performance, etc. whether from theory analysis or experimental study in this thesis.Setting out from the study of prestressed concrete ultra-thin beam bridge, this thesis firstly puts forward the concept of new-type double-prestress ultra-thin composite structure to solve the existing problems in actual projects; then demonstrates the theory, construction technology and loaded property; finally, taking real bridge as an example, compares the new structure with other three kinds of structures, and verifies the unique superiority in controlling the structure distortion and the promising popularization prospect and application value.The theory needs to be proved by practice. On the basis of calculation analysis of the theory, the static test research on double-prestress ultra-thin composite structure is made to study its static loaded performance during the course of construction. At the same time, depended on the creep test of double-prestress composite structure which is just being observed, the calculation theory and method of the redistribution of stress of double-prestress composite structure is studied and some helpful reference for design and research of this new-type structure is offered in this thesis.Because of low height of building, small size of section, the rigidity of double-prestress ultra-thin composite structure is relatively low and is comparatively sensitive to motive force of vehicles. The comfortable degree and impact coefficient of pedestrian passage bridge under moving vehicle load is studied in this thesis by ANSYS finite element procedure.Finally, on the basis of summarizing full thesis, several questions still required more study is put forwards.