Energy efficiency of timber construction joint with wooden screw

Abstract

The topicality of studied subject is based on inappropriate usage of different materials in wooden structures , since using metal joint in wooden construction leads to reduction of construction working life cycle . In this regard, a study of several options for wooden screw carving was conducted in order to determine the most appropriate one (screw). There are several different types of carving, such as: trapezoidal, triangular, recta ngular, etc. The most appropriate ones are trapezoidal and triangular - section threads for wood en screws. The effectiveness of a wooden screw thread was determined from the conditions ( capacity ) of sh ear fracture and bearing stress . After analyzing the results of calculati ons of the specific capacity for shear fracture and bearing stress , it can be concluded that the value of specific bearing capacity for shear fracture is less than the value of bearing stress by 1.3% . T herefore , a f urther comparison of the trapezoidal thread and the triangular cross - section will proceed from the spalling conditions. It has been found that the most effective thread is a triangular cross - section. Based on the results of calculations, a mathematical mod el has been established that describes the dependence of the carrying capacity on the screw diameter.