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While BRBs using laminated timber as a restrainer have been widely studied, timber restrainers have lower stiffness than steel restrainers with higher risk of fragile crack failure, it is necessary to consider the safety factor of global buckling, global stability of restrainer ends and local bulging failure at restrainer. In this study, a wide range of mock-up loading tests on BRBs with timber restrainer were carried out with different core-to-restraint compositions, in-plane and out-of-plane clearances, with and without core additional steel plates, and with different boundary conditions. Their exhibited failure modes are carefully studied and evaluation methods are proposed.