Experimental And Theoretical Study Of Wood Embedment

Node is a key component of the structure, which play a controlling role in the entire structural strength, stiffness and ductility. Previous surveys founding that, extreme loads (such as earthquakes, typhoons),node poorly designed is the main factor in wooden structure collapse, and wooden structure in the past often emphasis on structure and components, while neglecting the importance of structural safety of nodes, which leading to serious consequences of the collapse of wooden structure due to node brittle fracture (split, cut, etc.) Researchers have come to understand that these issues abroad, and effort to carry out research in this area.Carried out on wood embedment theory and its applied research, not only because embedment is the main factor for deformation of timber node, but also leading to brittle fracture in timber node area. Wood is a more complicated orthogonal anisotropic material. In this paper, In this paper, fir is used as the experimental material by choosing different thickness and different pressure position of the specimen to carry out experimental study of embedment in order to investigate the relationship among elasto-plastic yield stress, elastic modulus and pressure position, the thickness. After experimental data fitted, wood Constitutive is simplified as two straight-line model. The qualitative relationship among embedment behavior and pressure position, the thickness is obtained using orthogonal test method. Based on Pasternak model, a simple formulation of embedment behavior is obtained, and the theoretical value of elastic deformation is calculated by MATLB verify the correctness of theoretical formulation, providing design basis for wood designers. Finally, embedment experiment is simulated by ANSYS, from which the law of distribution of the tensile stress is got, providing theoretical support for node design and reinforcement.