Abstract
This study is to propose a timber-steel hybrid beam string structure with local lumbers of general distribution. The proposed system is that local constructors can handle locally grown lumber without special materials or techniques. We obtained the structural performance of this unique construction method through bending experimental tests of individual assembled upper-string members and structural tests and structural analysis of the timber-steel hybrid beam string structure. Findings through this study include the following：
・The bending performance of the joints of the upper chords of laminated timber under wind loads at blowdown and unbalanced snow loads was determined through structural tests.
・An elastic analysis with replacement of beam and spring elements was performed to obtain specifications of sections and joints for various loading conditions.
・Through bending experimental tests on the timber-steel hybrid beam string structure, we considered that the analytical results are compared and the validity of the experimental results.
