The purpose of this study is to create and verify the performance of large-span parallel chord truss as a design case for medium-to largesized timber structures. In this paper, the authors carried out the bending tests on full-size truss and validated them with elastic analysis models. The experimental results showed that the yielding of the steel used in the joints plasticized the trusses. In addition, the design criteria were satisfied by applying the uniformly distributed load to an analytical model simulating the truss.

We studied and developed tensile joint of wood with round bar steel and washer, which can be adapted in wooden king-post truss or wooden parallel chord truss and so on. Upon developing, we had conducted tensile element test and grasped the characteristics of those. In 2015, a revised edition of JIS A 3301-2015 (Design standards for wooden construction of school buildings), adopting these tensile joint of wood with pulling bolts in roof structure of king-post truss, was published.

Wooden trusses are effective method for constructing long span beams using standard size timber for residential use which is under six meters long. In this research, in order to create the standard drawings, the full-size bending test of parallel chord truss which took up three tree wood and was consisted by typical metal fittings and joints that can be produced by pre-cut system was carried out. As the results, it indicated structural property of each wood species and calculation formula to estimate the yield strength and the rigidity was established.

No abstract