Study On The Effect Of Slip On The Bearing Capacity Performance Of High-strength Steel-encased Concrete Composite Continuous Beams

High-strength steel-encased concrete composite continuous beams is the kind of composite structure which exploits the advantages of the concrete and steel.It worth great application in the social engineering with the strong points of good loading capacity,large rigidity and cost-saving compared with the traditional form of composite beam.Relative interface slip problem exists in the usage of composite continuous beams which weakens the combination of the whole structure and increase the deformation and decrease the loading capacity.It is necessary to take the slip effect into account.This essay analyzes the impact of three aspects of slip on the high performance of steel encased concrete composite continuous beam performance from the experimental study, finite element simulation and theory aspects.The main work can be seen below:(1)Test on the composite continuous beams with the span of 4 meters was carried out to analyze the failure process,the load deflection curves and load- slip curves.Conclusions would be put forward that slip effect affected the working status of the beam while the outsourcing steel beam and the reinforcement in the negative moment worked well.And continuous composite beams was failed in bending overloading typically.(2)Linked with the characteristics of the high performance steel encased concrete composite continuous beams,this research would simulate the composite continuous beams with the finite element software ANSYS.Test results of composite continuous beams had good agreement with that of the simulation results via the validation of the test.It exhibited good promotion significance of the computational mode.Slip law and deformation characteristics of the composite continuous beams with different shear connection coefficient can be obtained via the ANSYS simulation.(3)By the comparison of the test results and simulation results,theoretical calculation formula of ultimate bearing capacity was established according to the the neutral axis location of the concrete slab and steel beam based on the simplified plastic theory.It provided effective advises for the design of the high strength concrete composite beam.(4)Based on the analysis of theoretical analysis, test and the computational simulation,this research has given out design suggestion for the making of the high performance of steel encased concrete composite continuous beams.