木 壳 屈 曲 约 束 支 撑 低 周 反 复 加 载 试 验 研 究

In order to improve the seismic performance of glued-laminated timber frames，the low-cycle loading tests of four timber buckling-restrained braces （TBRB） are carried out. The mechanical properties，failure modes，hysteresis curves，ductility，and energy dissipation capacity of timber buckling-restrained braces are analyzed. The test results showed that the failure modes of the specimens include the tensile failure of steel core，local buckling of steel core and local compression failure of timber，multi-wave buckling of steel core and crack of timber. The hysteretic curve of each specimen has a typical fusiform shape，which means TBRB have good energy dissipation capacity and large initial stiffness. The ductility and energy dissipation capacity of TBRB strengthened with steel plates and end-reinforced hoop are significantly improved，compared to the TBRB without being strengthened. The test results show that TBRB strengthened with steel core plates and end-reinforced hoop can achieve better seismic performance，which reveals the application prospect in seismic design of glued-laminated timber frames.