Experimental Study On Flexural Mechanical Properties Of Glued Bamboo Beams Based On FRP

Based on the bamboo stacking method of glued bamboo beams,this paper divides the glued bamboo beams into two large groups,ie lateral stacking beam and vertical stacking beam.The carbon fiber cloth is used to reinforce two large groups of test pieces,each large Under the group,four groups were divided according to the amount of carbon fiber cloth.Based on this,the bending elastic modulus and bending ultimate bearing capacity of each set of specimens were tested,and the results of the two overlay methods were with the test results.The elastic modulus and the ultimate bearing capacity,in the two overlapping modes,observe and analyze the effect of the amount of carbon fiber cloth on the ultimate bearing capacity and the failure mode of the bamboo beam,especially the destruction of the cement layer of the bamboo beam.The following conclusions are drawn:(1)According to the test phenomenon,the destruction of all specimens has been found in the following two categories:1)Bottom bamboo cracking2)Cracking of a glued surface(2)According to the classification of bamboo lamination directions and analysis of test results,it was found that the ultimate bearing capacity of transverse lamination is higher than the ultimate bearing capacity of vertical lamination.(3)According to the classification of the amount of carbon fiber cloth(FRP),combined with the analysis of test results,it was found that with the increase of the amount of carbon fiber cloth,the ultimate bearing capacity also increased accordingly.(4)All specimens basically meet the flat section assumption during loading(5)In general,the failure mechanism of glued bamboo beams and FRP-reinforced glulam beams is generally consistent,and there is no substantial improvement due to the sticking of FRP at the bottom of the beam,but it will cause delayed failure.(6)View the load deflection curves of all the specimens and find that the load deformation of most specimens is basically linear.(7)By testing the flexural modulus of elasticity of each set of specimens in the two superposition methods,the following conclusions are obtained: the average flexural modulus under vertical superposition is 7320 MPa,and the average flexural elasticity under transverse superposition The modulus is 8220 MPa.Based on this,combined with the finite element software abaqus,the eight groups of test specimens were simulated by physical analysis.The analysis results are basically the same as the test results.The built-in cohesive element of abaqus can be effective for the simulation of the glue layer of glued bamboo beams.Solve this simulation process.Finally,a series of basic assumptions were made for the glued bamboo beams.Based on this assumption,combined with the constitutive curve of the bamboo materials glued with bamboo beams,the formulas for the three ultimate bearing capacity under the boundary conditions based on the two section methods were deduced.The applicable formula is a glued bamboo beam with good cementation effect.