The Research On Torsion Performances And Calculation Theory Of Steel Reinforced Concrete Structure

The inside steel of steel reinforced concrete structure bonds with the outsourcing reinforced concrete as an integral to resist the external forces that can be make full use of the intensity of their advantages. As the result of the existence of combination effect, its mechanical performance is better than the simple superposition of reinforced concrete and steel. This determines the SRC structure is an ideal earthquake-resistant structure and its application is becoming more and more widely, especially in high and large span structures. With the development of the society, the height of buildings is higher, span increasing, appearance more irregular and functional partition structure form more complex. There has been a lot of torsion problems need to be resolved In urgent. Therefore, the research on composite torsion performance of SRC structures and design calculation theory can promote and improve the seismic performance of high-rise buildings and large span bridges in our country to ensure that the design of buildings or other structural components meet the safety, economy and practicability. Also it can fill the blank of SRC structure design specification of torsion design, promote the development of theory of SRC structures. Study on torsion components is complicated, big and wide. In this paper, Preliminary study on SRC components under low reversed cyclic load of torsion performance and design calculation theory is conducted on the basis of test.(1) The paper mainly studies the seven roots of steel reinforced concrete columns and1reinforced concrete comparison column under low reversed cyclic loading. Twisted ratio, axial compression ratio, stirrup ratio, steel or not, with or without studs as parameters for researching failure process and failure mechanism of steel reinforced concrete column under composite torsion,observing cracks location, development angle and width, decrypting steel, longitudinal bars, stirrups, concrete’s stress-strain distributions.(2) Theoretical analysis of test results is performed for knowing the effect on the specimen torsion performance by changing the parameters. Seismic performance of the specimen is systematic study on the indicators of torque-twist rate hysteretic performance, the intensity attenuation, rigidity degeneration, energy dissipation capacity.(3) Based on the superposition principle, the sand heap analogy method and the variable angle space truss model are applied to the SRC member torsion research analysis. Calculation formula of cracking torque, ultimate torque are deduces, steel reinforced concrete composite torsion related equations are put forward.(4) Summary the research achievements of this paper and that needto be improved, and put forward suggestions for further research on SRC Structural components.