Theory And Related Experimental Study On Bending Behavior Of Corn Stalk Recombinant Glulam Beams

With the introduction of relevant national policies,a large number of wooden structures have emerged.The massive use of wood in the field of building structures has made the current nationwide forest resources face challenges such as low reserves and depletion of resources,and the contradiction between supply and demand is increasing.The reconstituted compositing material of corn stalk is a new generation of wood material made from corn stalks after a series of processing and processing.It has the characteristics of higher strength than wood,environmental protection and energy saving,and a wide range of applications.At present,there are many researches on the processing technology of corn stalk reconstituted glulam,but there are few applications in the field of building structures.Therefore,research on the structural properties of reconstituted com-plete corn stalks has important theoretical significance and application value.In this paper,the corn stalk reorganization material under the specific process is taken as the research object first,and the five basic physical and mechanical performance indexes are measured and analyzed by the material performance test with reference to the test methods and relevant specifications of wood,reconstituted bamboo and glulam.The results showed that the tensile strength of the corn stalk reconstituted material was 88.5 MPa,the compressivestrength was 49.0 MPa,the transverse compressive strength was 10.6 MPa,and the compressive elastic modulus of the grain was 9018 MPa.The elastic modulus is 1024 MPa.Next,finite element software ANSYS16.0 was used to simulate and analyze the bearing capacity,deformation,stress and failure of 8 beams,in which B1 was a wood beam and B2 to B8 were recombined glulam beams of corn stalk.B1 and B2 are to explore the advantages of the new material in structural performance;B2 to B4 and B8 are the influence of the analysis span on the structural performance of the beam;and B4 to B7 are the effects of the analysis of the height of the cross section on the structural performance of the beam.Through calculations,the load-span-middle deflection curve,stress cloud diagram,loadplastic strain curve,etc.of each beam are obtained.After comparative analysis,when the beam has the same cross-sectional dimensions and different spans,the bearing capacity gradually increases as the span increases.The stiffness decreases as the span decreases and the section width becomes the same.When the height of the section increases,the bearing capacity increases significantly and the stiffness increases.Finally,on the premise of basic assumptions,based on elasticity,elastoplasticity theory and wood structure calculation methods,the possible failure modes of reconstituted com-plete beams of corn stalks are analyzed,and the formula for the ultimate flexural capacity of reconstituted com-plete beams of corn stalks is deduced.The ANSYS calculated value and the theoretical formulacalculated value,the two are in good agreement.