New Type Connections Of Wood Frame And Their Influence To The Performace Of Structures

The behavior of structure is dependent on the connection joints,while the influence in timber structure is even more because of its own property,so the designing of connection is the most important content in timber structure.With the development of modern technology,modern timber structures begin to develop in the direction of large span and space.So, it is necessary to design connections with higher load-carrying capacity and better ductility to satisfy structure requirements.Bolted timber connections with slotted in steel plates have poor ductility and low moment resisting capacity. When subject to loading such as seismic forces, the connection may experience bending moments,and the connection could fail prematurely because it may not be able to provide the needed moment resistance as they are governed by the lower tension perpendicular to grain and longitudinal shear strengths of timber. So,using some improved methods to avoid the brittle failure of bolted beam-to-column connections has important practical engineering values.Two new type joints were designed based on the bolted timber connections with slotted in steel plates.This paper mainly deals with the failure mechanism and mechanical behavior of new type joints of timber structure,in contrast with bolted timber connections with slotted in steel plates.The formula of the load-carrying capacity of new type joints was derived based on the Johansen yield theory. Main contents can be divided into the following several parts:The timber material test was first implemented to provide indicators for calculation of load-carrying capacity of joints.The cyclic loading tests of bolted timber connections with slotted in steel plates and two groups of new type joints were conducted, to study the failure mechanism and mechanical behavior.The calculative methods of load-carrying capacity of bolted timber connections with slotted in steel plates and new type joints were analyzed,and their results are in good agreement with the tests.The theory of calculation of semi-rigid connections was studied,and a numerical example was used to analyze the influence to structures.