Development of techniques to study the behavior of bolted wood joints Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/4x51hm174

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  • The design of bolted wood joints has, to date, been primarily based on empirical work. Much of this has been on single bolted joints. The extrapolation of this data to cover multiple bolted and large diameter bolted joints is questionable. There appears to be a lack of basic understanding of the behavior of bolted wood joints as they are loaded to failure. This thesis is concerned with the development of two techniques that may be used to gain a better understanding of bolted joint behavior. The first technique involves the use of wood wafers or lamina which provide a two dimensional representation of a bolted joint during loading. It involves mounting a specially cut thin section of wood between two glass plates with a steel pin representing a bolt passing through the resultant wood glass sandwich. The approach is used to observe the wood deformation around the bolt in a plane normal to the bolt axis. It may also be used to simulate multiple bolted joints. The third dimension of the joint (in the axial direction of the bolt) is added by the second technique. This consists of taking x-ray scans of complete joints as they are loaded to failure. The bending behavior of bolts and associated wood deformation as they are effected by a range of joint parameters may be quantified in this way. The development and numerical integration of these two techniques will, it is hoped provide means to obtain a clearer three dimensional understanding of the behavior of bolted wood joints.
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