Experimental Research On Mechanical Properties Of Larch Glued Two-way Wood Slub

Modern wood structure has many characteristics,such as environmental,renewable,green and low carbon which can promote civil engineering development in our country towards to the green,low carbon and harmony direction.Modern wood structure also can implement the basic state policy of resource conservation and environmental protection in China and has important economic,ecological and social benefits?Two way slab has been widely used in the industrial and civil buildings and bridges of Modern wood structure as the plane key component,especially with the developing of large span and large space wood structures and bridges,the application of span of the two-way slab is longer and longer?However,domestic and foreign research has recently been focusing on reinforced concrete two-way slabs,meanwhile,the experimental study on the performance and calculation of the two way slab of glue laminated wood is extremely rare and the design specification of the wood structure is very vague for the calculation of the stiffness and deflection of the plywood which has brought a lot of controversy?This thesis based on the Xing an Larch as the raw materials,manufacturing glued wood with resorcin as adhesives.The experimental research of bending capacity to the Larch glued wood two-way slab was carried out to study and analyse the effect of plane size on the deflection and strain of larch wood two-way slab and the development and morphology of crack in slab bottom surface?And Midas Civil was applied to the model?The main tasks were listed as follows:(1)The thesis compared and analyzed the glued wood structure related theory at home and abroad,at the same time,the classic theory of the linear elastic slab and the computation of nonlinear finite element analysis are reviewed and the problems and deficiencies in the design and calculation method of the domestic and foreign glued laminated wood are proposed.(2)In this paper,the experimental research on the two way slab of the both sides simply supported and subjected to distributed load is carried out,including six simple supported two-way slabs with different edges,to test the deflection and strain of a number of points and study the development law of crack and deflection in the whole process of the glued wood two-way slab under vertical distributed load?Furthermore,the thesis has analyzed and compared the effect of size on deflection and strain of laminated wood two-way slab and explored the rules and feature of rigidity and curvature of glued laminated two-way slab with simply supported at opposite ends so as to provide experimental data to verify the theoretical analysis results.(3)The finite element method of Midas Civil was applied in the vertical distributed load analysis of glued laminated wood two-way slab?Researched model of load-displacement curve,stress and strain distribution,and compared with the results of the experiment.The results showed that the use of finite element software Midas Civil calculation results were closed to the experimental results and fitting very close in elastic deformation stage,but there exist certain difference when the vertical distributed load was bigger,and the thesis analyzed the reasons of the differences in this paper.(4)The finite element method of Midas Civil was applied in the vertical distributed load analysis of simply-supported glued laminated wood two-way slab?Researched model of load-displacement curve,stress and strain distribution;The load displacement curves and the stress and strain distribution has been summarized?...