Study On Shear Behavior Of Corn Stalk Integrated Composite Beam

According to the Eighth Forest Resources Census Report of the State Forestry Administration and related policies,it is imperative to save wood resources,and the development of new wood-based materials will inevitably become a trend.The research shows that the annual output of corn stalk accounts for half of the total value of straw in the country.If corn stalk can be used as a new type of substitute wood material,it can fundamentally solve the situation that the timber market is in short supply,and can also deal with agricultural waste to some extent.Protect the environment and promote economic growth.In this paper,the corn stalk integrated reconstituted material was simulated firstly.The ANSYS16.0 finite element software was used to simulate the loading of four specimens with different shear span ratios.The ultimate load of the beam members decreased with the increase of the shear span ratio..The ultimate loads of B1,B2,B3,and B4 are 83.656 KN,65.6943 KN,49.1997 KN,and 38.1753 KN,respectively.The maximum deflection of the beam is 180.335 KN,176.402 KN,146.662 KN,and 89.7251 KN,respectively.The load-span deflection curve,section-strain height curve,deflection change value,load-plastic strain curve and other related data are obtained.Next,the production process of the corn stalk integrated composite beam and the size of the test piece are introduced.The test specimens are subjected totwo-point loading under different shear-to-span ratio conditions to describe the failure mechanism and the measured data.When the same degree of mid-span deformation is achieved,the load required for each member is different.When the displacement reaches 60 mm,the B2 beam with the shear-to-span ratio of 1can bear the maximum load,while the B4 beam with the shear-to-span ratio of 2is the largest.The load that can be tolerated is minimal.After 41 KN,the B3 beam is destroyed,and the B2 beam with a shear span ratio of 1 becomes the member with the largest load under the same deformation.The analysis and comparison show the load-span displacement curve,the mid-height-strain curve,the mid-span stress-strain curve,and the load-strain curve of the curved shear zone.Finally,under the premise of basic assumptions,the causes of the oblique cracks of the beam members,the transmission mechanism of the shear members of the beam members,and the shear failure state of the beam members are analyzed.According to the empirical formula of the shear capacity of the beam member and the error between the theoretical calculated value and the experimental measured value,the error of the shear capacity under different shear span ratios,and compared with the wood structure specifications,the relative safety is obtained.The calculation formula of the shear capacity of the reliable corn stalk integrated composite material.