Document Type : Research Paper
Authors
1 - Ph.D. Student, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj.
2 Associate Professor, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj.
3 Professor, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj.Iran.
4 Associate Professor, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj.Iran.
Abstract
From the limitations of detecting the amount of useful life remaining in the components of the structures in the conditions of use with acoustic methods is the impossibility of calculating the modulus of elasticity due to the impossibility of removing the part from the structure. Therefore, most of the classifications during use in the components of structures such as historical buildings are based on measuring the speed of sound. In this research, to calculate the local and global density with the method of pin penetration rate in wooden tie in order to calculate the amount of their remaining useful life by combining stress wave and free longitudinal vibration methods has been studied. There was no significant difference between the values of global sound velocity and global modulus of elasticity with the local results of these factors at the five tested points in each of the wooden tie. Also, there was no significant difference between the density calculated by the ISO 13910 standard method and the results of the pin penetration rate method. There was optimal exponential correlation between modulus of elasticity calculated from stress wave method and damping factor from longitudinal vibration. The results indicated that the combination of the three mentioned methods has a very favorable efficiency for the classification of wood during consumption and without leaving the structure.
Keywords
Main Subjects
)