Experimental Study On Seismic Behavior Of PSRC Beams With Prefabricated Rectangular Webs

The steel reinforced concrete structure is a steel-concrete composite structure formed by placing steel in the reinforced concrete section.The steel reinforced concrete structure has the advantages of high rigidity,good earthquake resistance and fire resistance.The current steel reinforced concrete structure has been used in some large high-rise buildings,and in the general high-rise buildings and multi-storey buildings are less used,the most important reason is the steel structure of the concrete structure of the site is more complex,which restricts the development and popularization of steel reinforced concrete structures.Prefabricated concrete structure is the first production in the factory prefabricated components,and then transported to the construction site,and finally assembled into the overall structure.This will simplify the construction process,speed up the construction speed and reduce environmental pollution.Meet the requirements of green construction.Facing the limitations of steel structure,integral Steel Reinforced Concrete Structure and Prefabricated Concrete Structure.Domestic and foreign experts put forward prefabricated steel reinforced concrete(referred to as PSRC)structure.The reinforced concrete structure is combined with the prefabricated concrete structure.In this paper,the seismic performance of precast rectangular web PSRC beam is studied.The research is as follows:(1)The low-cycle repeated loading test was carried out on five prefabricated rectangular web PSRC beams.(2)Mainly study its failure mode,hysteresis curve,ductility,stiffness degradation,energy dissipation capacity,deformation recovery ability and other properties.(3)The effect of shear span ratio and cast-in-situ concrete strength on the seismic behavior of prefabricated rectangular web PSRC beams was analyzed.(4)According to the design code of concrete structure,the cracking behavior and the flexural bearing capacity of the prefabricated rectangular web PSRC are deduced,and the validity of the formula is verified by the theoretical value and the experimental value.Research indicates: Increasing the shear span ratio of the test beam can make the hysteresis curve more full,the ductility is improved,the energy dissipation capacity is enhanced and the stiffness degradation is slowed down.The strength of the concrete in the upper part of the beam is improved,and the bearing capacity of the beam is slightly improved,but the displacement ductility coefficient is reduced and there is no obvious effect on the stiffness degradation.The theoretical and experimental values of the bendingmoment and the normal bearing capacity of the test beam are in agreement with each other,and the validity of the formula is verified.