采用开孔槽钢抗冲切的钢筋混凝土墙板内置无粘结钢板支撑滞回性能试验研究

o avoid punching shear failure of reinforced concrete panel for the unbonded steel brace encased in panel and to efficiently use the energy dissipation capaciy and duclility of the encased steel brace, constructional details of thin-walled steel channels with perforated web used to resist punching shear forces were proposed and two quasi-static tests were carried out to mainly examine the effects of details of perforated channels and ribs of the braces on hysteretic behavior of the diagonal unbonded steel plate brace encased in reinforced concrete panel. Results reveal that the perforated channels can avoid the punching shear failure of panel although punching shear cracks still occurred around the ends of panel. Besides, compared with ribs of brace arranged flat, the ribs of brace arranged upright can decease the width of gap between the panel and the brace near the tips of ribs and therefore decrease the punching shear forces applied to the panel by the ends of brace. The specimens exhibited stable hysteretic behavior and had substantial ductility and energy dissipation capacity before tension fracture of the encased brace occurred.