The Analysis And Analysis Of The Bending Bearing Capacity Of The Thin Wall H Steel Composite Beams Were Calculated

Steel and wood composite beams as a new type of composite beams,it would have plasticity,ductility,high strength steel and wood with green environmental protection,good earthquake resistance performance advantages,particularly suited to light of multi-storey building structure,complied with national push the direction of the development of green environmental protection,accord with the requirement of our building industrialization and fabricated,but how to effective composite steel and wood formation bearing capacity,superior durability performance for composite beams is still needs further research to explore problems.The performance of flexural capacity and calculation and analysis of new steel composite beams have practical engineering value.In this paper,a new type of thin-walled h-shaped steel composite beam is formed by combining thin-walled h-beam and wood through screws and viscose.According to the carrying capacity and calculation analysis of the beam,the following research work is carried out:(1)this paper carried out experiments on the physical properties and mechanical properties of wood and thin-walled sections,as well as the flexural bearing capacity of simple supported thin-walled h-beam composite beams.The mechanical property parameters of the main materials and the loading process of the load were obtained,and the experimental results of the P-curve and cross section along the height strain distribution were obtained.The failure mode failure mode of the failure process of thin-walled h-beam composite beams was investigated.The combination mechanism and bearing capacity of thin-walled h-beam composite beams are revealed.(2)in this paper,the theoretical derivation of the calculation formula of the bearing capacity of the thin-walled h-beam composite beams is carried out in consideration of the slip of the composite beam.On the one hand,from the strength state capacity perspective,the finite element elastic bearing capacity and limit bearing capacity of twostages,put forward the corresponding theoretical calculation formula of bearing capacity,and is verified with the experimental results.Finite element analysis on the other hand,considering the slip factor,in normal use limit state condition,puts forward the symmetrical concentrated load load deflection of simply supported composite beam equation,calculate the theoretical deflection value,and is verified with the experimental values.(3)ABAQUS finite element analysis software was used to simulate the carrying capacity of thin-walled h-beam composite beams.In this paper,the finite element model,finite element modeling,boundary condition and load loading method are used to simulate and verify the rationality of the experiment results.Based on the rationality of numerical simulation,the influence factors on the bearing capacity of composite beam steel strength,wood flange width,flange thickness,web thickness and section "reinforcement ratio" were carried out.By carrying out the research and analysis of bending experiment,bearing capacity-deformation theory and numerical simulation calculation of thin-walled h-beam composite beams,the following conclusions are drawn:(1)through the analysis of bending experiments of thin-walled h-beam composite beams,the composite beams can realize effective combination of steel and wood,and the carrying capacity of relatively pure timber beams is improved effectively.Data analysis,under the condition of the same wood use,thin-wall h-beam-wood(cedar),finite element analysis(cedar flange + Caribbean pine web)than pure wooden beams bearing capacity is increased by 43.15% and 45.45%respectively.(2)the factors influencing the thin-wall h-beam-wood bearing capacity of composite beams with flange plate width,height,web plate thickness,web plate thickness,the thickness of the flange plate,through the experimental analysis of the bending,draw a composite beam flange plate width,height,web thickness and thickness ofthin-wall h-beam flange plate of thin-wall h-beam wood composite beams was evidently affected by the bending bearing capacity.(3)based on the theoretical calculation and verification analysis,the sliding coefficient is proposed to be equal to 1.30,and the bending capacity of the composite beams is the most accurate and the most accurate.At the same time,the calculation of the bearing capacity of composite beams is more accurate.(4)through the finite element numerical simulation research shows that the use of cohesion Cohesive unit simulation finite element elastoplastic stage bearing capacity was good consistency between the calculated and experimental results,the Cohesive unit simulation is reliable and feasible.(5)the qualitative analysis of numerical simulation results shows that the influence factors of wood flange width,flange thickness and section "reinforcement ratio" have obvious influence on the bearing performance of composite beams;From the data of quantitative analysis shows that in the reinforcement ratio under the condition of constant,wood unit 20 mm flange width capacity effectively increase 10.25%,wood flange unit 5 mm thickness of bearing capacity effectively increase by about 8.88%;The "reinforcement ratio" unit increased by0.70% and the carrying capacity increased by 5.20% effectively.