Study On Pseudo-static Test And Design Calculation Of Steel Reinforced Concrete Composite Beams

Steel-reinforced concrete composite structure is the application of steel-reinforced concrete composite structure,inheriting the excellent mechanical performance of steel-reinforced concrete structure,but also good economic benefits of composite structure.However,there are few research materials about this kind of structure at home and abroad.In order to popularize this type of structure better and faster,its seismic performance and design calculation need to be further studied.Therefore,this paper has completed the following main contents through the experimental research and theoretical analysis of the composite beam:(1)The pseudo-static tests of 10 U-section web PSRC beams and 1 cast-in-situ SRC contrast beam and 1 U-section web PSRC beam were carried out.The stress process and failure pattern of PSRC beam and cast-in-situ beam under quasi-static action are observed.In addition,the influence of shear-span ratio,strength of cast-in-place part of concrete,type of section steel,shear connection,loading mode,web pouring type(empty,solid)and type of cast-in-place part of concrete on the mechanical performance of PSRC beam is also analyzed.(2)Combined with the test results of research,analysis the influence of various parameters on properties of PSRC beams bearing,and based on the calculation of flexural capacity of SRC beam with solid web in steel and concrete composite structure,focusing on the structure characteristic of the u-shaped cross section of composite beam web and the specimen under the positive and negative bending moment and axial location of the different conditions are analyzed in detail,set up under the positive and negative bending moment solid-web PSRC beam calculation formula of flexural bearing capacity of normal section.(3)Combined with the experimental results,the influence of various parameters on the bending stiffness of PSRC beam section was analyzed.Based on the superposition relation of SRC beam stiffness calculation and the short-term stiffness calculation formula of composite members in the current code for design of concrete structures,the short-term section stiffness calculation method of PSRC beam with two-stage stress was established.