Design Technique And Engineering Application Of Long Span Reinforced Concrete Structure

The traditional reinforced concrete has been difficult to meet the requirements of the large span,the heavy load of cracks and the deformation.Therefore,the prestressed and steel technology has been widely used in large span structures.By applying the prestress in the concrete structure,enlarging the elastic range of the structure,adjusting the internal force distribution of the structure,improving the crack resistance and bearing capacity,reducing the deformation,achieve the purpose of controlling the long-term deflection.At the same time,the built-in steel can significantly reduce the weight of the structure and reduce the size of the section under the premise of ensuring the bearing capacity and normal use of the structure.In this paper,the author takes a large span irregular building project as the research object,using the structure design software of PKPM and the finite element analysis software of ABAQUS,and puts forward two schemes of the prestressed concrete beam and the steel reinforced concrete beam.The main conclusions are as follows:(1)This paper puts forward the prestressed concrete beam scheme,not only detail the design process of the post tensioned prestressed concrete frame beam,but also discusses the technical indexes of the long term deflection,crack of the long span concrete structure controlled by the prestress technology.(2)This paper puts forward the scheme of steel reinforced concrete beam.Through the comparative analysis of the bearing capacity,deformation and economic indexes,determine the optimization method of the steel section.At the same time,comparing the structural and economic characteristics of the prestressed concrete beams and the steel reinforced concrete beam,determine the advantages of two large span reinforced concrete structure schemes.(3)By using modal analysis and time history analysis method,calculating the seismic response of prestressed concrete beams and steel reinforced concrete beam under vertical earthquake action,the displacement and acceleration curves of structures are determined.The study shows that the prestressed concrete beam and the steel reinforced concrete beam has good seismic performance.The design method presented in this paper solves the technical problems in engineering,and compares the two schemes from the economic point of view,which is the great practical value for the engineering.The research results of this paper can also provide reference for the design of the same large span reinforced concrete structures of the same type.