| The application of Compound concrete in prefabricated building components is well in line with the development strategy of building industrialization and green energy saving promoted by China ’s construction industry.In this paper,a kind of prefabricated Compound concrete structural column and ring beam is developed.Based on the feasibility of engineering application,the theoretical analysis and experimental research of the key technical problems such as the design,manufacture,connection,structure,construction technology and basic mechanical properties of the prefabricated sections of the structural column and ring beam are carried out.The seismic performance of the structural column confined wall is studied by experimental research and finite element analysis.The main research contents and conclusions of this paper are as follows:1.A new type of prefabricated Compound concrete structural column and ring beam was developed.The structural column and the ring beam are prefabricated in sections in the factory and assembled and connected on site.Inverse the traditional construction method,first assembly structure column,then masonry wall,and then do ring beam section installation on the wall.This technology makes the prefabricated rate of components greater than 82 %,in which the abandoned concrete block can replace 25 % of the new concrete,and the comprehensive cost is reduced by about44 % and 27 % compared with the traditional cast-in-situ structural column and ring beam,with significant benefits.2.The bending-shear test of precast compound concrete structural columns and ring beams was carried out,and the influence of connection methods and discarded concrete blocks on the bending and shearing performance of structural columns and ring beams was discussed.The results show that: 1)Compared with the connection of planted reinforcement glue,the prefabricated structural column connected by grouting mortar has better connection performance,and the ultimate bearing capacity and initial stiffness are increased by 4.5% and 4.2% respectively;2)Prefabricated ring beam The connection mode of "prefabricated section-overlap section-prefabricated section" can be adopted.Compared with the cast-in-situ ring beam,the ultimate bearing capacity of the prefabricated ring beam is almost unchanged,and the initial rigidity is slightly reduced;3)The incorporation of waste concrete blocks has no effect on the force performance of the pre-constructed column and ring beam.3.Through repeated low-cycle loading,the seismic performance of the prefabricated compound concrete structural column restraint wall and the cast-in-situ structural column restrained wall was tested and analyzed.Compared with the wall restrained by cast-in-place structural columns,the precast structural column restrained walls: 1)the ultimate bearing capacity is reduced by 26.4%,and the failure displacement is increased by 69.1%;2)the equivalent viscous damping coefficients of the limit point and the failure point are increased respectively 14.6% and 46.9%,Cumulative energy consumption increased by 37.96%;3)The displacement ductility coefficient at the failure stage increased by 49.1%.The results show that the confined wall with compound concrete structural columns has good seismic performance,and has better deformation and energy dissipation capabilities.4.Carried out the finite element numerical simulation analysis of the seismic performance of the wall restrained by the structural column.Based on the ABAQUS finite element analysis software,the analysis models of the constrained wall of compound concrete constructional columns and traditional cast-in-situ constructional column constrained walls were established respectively.Through repeated low-cycle loading,the results show that the crack development of the wall,the hysteretic skeleton curve,and the stiffness degradation curve are in good agreement with the test,verifying that the prefabricated compound concrete structural column has a good restraint effect on the masonry wall. |
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