Mechanical Performance Test And Analysis Of Full-scale Components Of Fiber Reinforced Wood Substrate

In recent years,earthquakes have occurred frequently in Sichuan area,causing a large number of masonry structures to be damaged in rural areas.On the contrary,wood-based houses show excellent seismic performance.The fiber wood-based materials studied in this paper are made of waste wood slabs,lightly burned magnesium chloride and magnesium chloride as raw materials,straw and chopped glass fibers as reinforcing materials.It can not only reuse waste materials and save resources,but also has the advantages of high degree of industrial production and fast construction efficiency,which lining with the trend of new urbanization construction.In order to popularize the application of this kind of structure in village buildings,four-point bending test,compression test and shear test are carried out for its typical plate members,and the displacement and strain are analyzed.Then the numerical simulation is carried out by using the finite element software Abaqus,and the results are compared with the experimental results.The main conclusions are as follows:(1)The full-scale flexural members of fiber reinforced wood substrates basically satisfy the assumption of flat cross-section,and the underlying cladding panels are more uniform in the process of bending.The failure modes are divided into two types,one is the bond failure between the edge plate and the clad panel at the bond point,the other is the damage of the edge plate itself.Once the component cracks at the cementation,it will fail in a short time.The mean value of maximum flexural capacity is 87.91 kN,and the mean value of maximum displacement in span is 24.98 mm.(2)Under compression,the failure modes of full-scale components of fiber reinforced wood substrates are mainly the bond failure between the edge plate and the clad panel at four corners.During the whole compression process,the out-of-plane displacement is very small,and it is not easy to destabilize.According to the strain analysis of the cladding panel,the strain distribution in the plane is more uniform.The maximum compressive bearing capacity is 571.79 kN for components with a compressive area of 550 mm *160 mm and 814.5kN for components with a compressive area of 730 mm *160 mm.The maximum compression mean is 11.83 mm.(3)Under the shear condition,the failure mode of the full-scale components of fiber reinforced wood substrates is mainly the failure of the support and the local failure of the channel steel loading.There is no classical shear failure(cable-stayed,baroclinic,shear).The maximum shear capacity is 330.71 kN,and the maximum displacement is 8.48 mm.(4)Whether it is bending,compression or shear member,its displacement is very small in the whole process of loading.During the test,the stiffness of the component does not change much,and it still has a certain bearing capacity after cracking.But once cracked,it will quickly fail,showing the characteristics of brittle failure.Therefore,for the sake of safety,it is suggested to design with its cementation strength.