Experimental Study And Numerical Simulation Of Fabricated Reinforced Truss Composite Slab Beam In Negative Moment Zone

In this paper,a fabricated steel truss composite plate beam in the form of prefabricated bottom plate and embedded angle steel connectors is proposed.The mechanical performance of the composite beam is deeply studied,including experimental research and finite element simulation research.In terms of tests,the full-scale tests of prefabricated reinforced truss composite beams with embedded angle steel connectors on the prefabricated bottom plate and reinforcement on the prefabricated bottom plate are carried out under negative moment concentrated load.Through the detailed comparison of different indexes,the characteristics of the mechanical properties of the two different forms of prefabricated composite beams are analyzed,that is,the differences.At the same time,this paper also uses the finite element software ABAQUS to simulate the test of two assembled reinforced truss laminated plate composite beams,more than this,this paper compares and analyzes the simulation results and test results through a number of indicators.Based on this,this paper carries out parametric research on the fabricated reinforced truss laminated plate composite beam,and analyzes the influence of the spacing of angle steel connectors and the longitudinal reinforcement ratio on its bending performance.In addition,this paper also simulates a group of cast-in-situ reinforced truss concrete composite beams,and compares them with the two groups of test specimen models.The main research contents and relaeted conclusions of this paper are shown below:（1）This paper summarizes the research status of cast-in-situ composite beams and fabricated composite beams at home and abroad in recent years,and finds that the mechanical properties of fabricated composite beams with different combination forms and different connection forms are different.At the same time,the reinforcement form of precast slab based on reinforced truss composite slab brings inconvenience and danger to on-site transportation and construction,A fabricated steel truss composite plate beam in the form of prefabricated bottom plate and embedded angle steel is proposed.（2）The results of the transverse test show that the failure form of the two assembled reinforced truss composite beams under negative bending moment are basically similar,and the failure of bending longitudinal shear crack occurs.The first crack of the two test piece all occurs in the mid span of the composite beams,and the crack also becomes the widest and deepest main crack in the final failure;The flexural capacity of the two are basically the same,but the prefabricated steel truss composite beam with embedded angle steel has greater flexural stiffness and better cooperative deformation ability;Both groups of specimens have relative slip,and the minimum slip is in the middle of the span,but the overall slip value of the composite beam specimen in the form of embedded angle steel is relatively small,indicating that the embedded angle steel can reduce the influence of slip effect on the fabricated reinforced truss composite beam.（3）Based on the results of experimental research,this paper are established the specimens of fabricated reinforced truss composite plate beams with different angle steel spacing and longitudinal reinforcement ratio are simulated by the finite element software ABAQUS.The simulation results show that the bearing capacity and flexural stiffness of fabricated reinforced truss composite plate beams increase significantly with the increase of longitudinal reinforcement ratio,and the best spacing of angle steel connectors in prefabricated base plate is 500 mm.（4）In addition to parametric analysis,this paper also simulates a group of cast-in-situ reinforced truss concrete composite beam specimens and compares them with the two groups of specimens in the test.The comparison results show that the flexural capacity and flexural stiffness of fabricated reinforced truss composite plate composite beam are greater,which provides a reference for the further research and practical engineering application of fabricated reinforced truss composite plate composite beam.Figure [63] table [9] reference [68]...