Evaluation method of bending strength by combined stress for glued build-up members made of box heart timbers

Glued build-up members (GBM) are structural building members that are developed as an application to effectively utilize Japanese domestic box-heart timbers. The purpose of this study is to establish a method to evaluate the bending performance of a GBM. In this study, a structural model is construct when vertical stress at the lower timber edges of the GBM subjected to bending is regarded as combined stress of bending component and tensile component. In addition, using the experimental results of the full scale GBM specimens, we evaluate it as a combination stress and verify the applicability of the evaluation method.