| The steel reinforced concrete structure had been attached importance to the construction industry for its outstanding mechanical properties.However,due to the difficult process of construction and high cost,it hadn’t been popularized in the projects.In view of this situation,this reseach group put forward the concept of Prefabricated Steel Reinforced Concrete(PSRC)beam.Combining with the characteristics of the traditional steel concrete beam and the composite beam,dividing the original casting component into two times of the prefabricated web and the cast-in-place flange.According to the different sections of the prefabricated webs,the PSRC beam can be divided into 3 different types,such as U type,V type and Rectangular type.In this paper,on the basis of the low cyclic reversed loading test and theoretical analysis of the U-type prefabricated section web PSRC beam,the following research work were carried out:(1)Low cyclic reversed loading tests were performed on three prefabricated U section PSRC beams.Analized the influence of shear span ratio and the strength of the cast-in-place concrete to the failure characteristics,load deflection hysteresis curve,skeleton curve,strain law,ductility,deformation recovery ability,strength attenuation law,stiffness degradation law and energy dissipation performance of the PSRC beams.(2)The comparison of experimental phenomena and result with V-type prefabricated section web PSRC beam and Rectangular-type prefabricated section web PSRC beam which were tested in the same period were taken.Analised the influence of different type of prefabricated section web on the bearing capacity and seismic behavior of PSRC beam.(3)Through theoretical derivation,combined with the experimental phenomena and data,established the formula of the bearing capacity and deflection of PSRC beams.(4)Based on the theoretical analysis and experimental result,a theoretical model of the three-fold skeleton curve of load-deflection of PSRC beams is formed,in addition,the expansion parametic analysis was carried out. |
