Research Of Metal Plate Connected Light Wood Constructions' Structure Capacity

Timber, it is a kind of construction material, it is the renewable resources that can well be recycled, all these are owned by timber only the advantage . The light wood trusses building of today is set up experience of the building , on the best practice method and normal foundation that require, having guaranteed the long-term security of the light wood trusses building, comfortableness, durability and serviceability. The truss plate connection used that the common one is most generally now too most in light wood trusses , can be prefabricated in advance ,manufactured in batches and save labors, lessen construction time, but is efficient and performance of joint is steadily, manufacturing is simple, In order to popularize the development in our country of light wood trusses , should carry on detailed research to the truss plate connection , offer the experimental bases of some designs , checking computations for wood trusses that the truss plate connection. Analyzed that knows the temperature, humidity of moisture content, tests of the timber have influence on the strength of bearing the weight of by the theory.The four truss plate's mechanical properties of are established through testing of plate joints. On the basis of experimental data to fit function of relationship of carrying capacity and slide and the corresponding curve. Know by test result material confrontation of dimension lumber have influence greatly to carrying capacity, particularly in wood fibre to pull onto the initial deformation, but the connection way of metal plate and dimension lumber having loud influence to carrying capacity and slip. Norms provided formula of resistance slide capacity and limitary tensile force, check formula of designing value, will test the data measured to bring into the checking computations in the normal formula that offer, emergence that stipulate in the norm 0.8mm relative to slip move bear the weight of strength value partial to guarding. Test still succeed in observing two kinds of different destruction shapes that the metal plate connection: One rupture suddenly in the middle of the board for tooth, destroy for metal plate limit of tensile force, it is the destruction of fragility; Another is tilted for one side or both sides of metal plate, break away from the dimension lumber, destroy the surrender of metal plate, it is the ductile destruction. Tested the strain of metal plate and dimension lumber to meet gage, obtain average bonding stress and slip theory and Ï„- S curve. Influence metal plate connection factor of performance have the surface of metal plate and superficial coarse intensity between surface of metal plate and dimension lumber.