The timber members were fastened to a bolted steel connection in timber bridges. The bolt holes in the timber were often made to be larger than bolt diameter to avoid the splitting of bolt holes and breakage of the bolt screws in setting up bolts into the holes. Therefore, a resin was filled into the clearance between the bolt and the bolt hole to prevent a backlash by the clearance. It has been predicted that the filled up resin contribute to the improvement of the performance of the bolted connection. And, the effect of the resin on the connection behavior has not been sufficiently clarified. The static tensile tests changed the parameter such as the resin thickness or the bolt diameter were carried out to clarify the effects of the resin to the pull-out properties which were the loading capacity, pulling-out behavior of timber from steel connection and strain distribution of timber near bolt.
