Experimental Study On In-plane Structural Performance Of Cross-laminated Timber Panels

Research on modern timber construction of our country is later compared to Europe and other countries. It is a popular trend that making research on Mid-rise timber construction and Europe and other countries have been making research on it for a long time. China should also carry out research on the Mid-rise timber frame construction of the relevant scientific issues as soon as possible. It could be on foundation for the future development of timber architecture.CLT is short for cross-laminated timber. With the development of Mid-rise timber structure abroad, because of its good mechanical properties, it is widely used in Mid-rise timber structures. But the study of the in-plane mechanical properties is not enough so that carry out experimental studies and theoretical analysis on the in-plane mechanical properties on the basis of research abroad, the main contents include:1. Making experiments as deep beams about its in-plane mechanical properties with monotonic loading tests. Test parameters including that: 1.Aspect Ratio 2.Layers of CLT panels 3.Opening of CLT panels 4.Lay-up of CLT panels. The experimental results show that: 1. Cracks can be found due to shear deformation and bending deformation in CLT panels of aspect ratio of three 2.Cracks appeared in CLT panels of aspect ratio of four mainly caused by bending deformation. 3.CLT panels is arranged in the form of the out layer of perpendicular to the grain is wrecked of its splitting failure of the the out layer of perpendicular to the grain. 4.The failure mode of CLT panels with opening is local failure so that failure load is much smaller than the CLT panels without opening. The in-plane effective stiffness is linearly to the size of the opening of the CLT panels.2. Proposing a theoretical mechanics model with elasticity.The panels parallel to grain is Sub-component 1, the panels perpendicular to the grain is Sub-component 2.CLT panel is a whole of Sub-component 1 and Sub-component 2. Under the concentrated load, you can make a reasonable distribution with the theoretical mechanics model also that you can calculate the stress and the deformation with the mechanics model. The experimental results are coincided with the results of the theoretical mechanics model well.3. The design method of the CLT panels of the in-plane performance is presented in this paper. Put forward the design value of wood strength refer to the experimental date and some relevant standards. According to this paper research and related basic theoretical methods, the design formula of eccentrically compressed members is presented.