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针对汶川地震中钢筋混凝土小跨高比连梁剪切破坏严重的问题,提出了内置钢桁架钢筋混凝土连梁和外包U形钢板混凝土连梁,并通过3个1/2缩尺比例连梁的低周反复荷载试验,评估该组合连梁的抗震性能。研究结果表明:按GB50010—2010《建筑抗震设计规范》设计的普通配筋钢筋混凝土连梁易发生弯剪破坏,内置钢桁架钢筋混凝土连梁发生了弯曲破坏而外包U形钢板混凝土连梁发生了弯曲滑移破坏。内置钢桁架钢筋混凝土连梁与外包U形钢板混凝土连梁的抗震能力均优于普通配筋混凝土连梁。与普通配筋钢筋混凝土连梁相比,内置钢桁架钢筋混凝土连梁的承载力、刚度、延性、耗能能力均得到有效提高;内置钢桁架连梁的承载力、极限位移角和位移延性较普通配筋钢筋混凝土连梁分别提高了10%,35%和25%。外包U形钢板混凝土连梁的滞回曲线饱满,延性和耗能性能显著改善,承载力退化缓慢;外包U形钢板混凝土连梁的极限位移角和位移延性较普通配筋钢筋混凝土连梁分别提高了27%和61%。
In order to solve the problem of severe shear failure of reinforced concrete beams with small span ratio in Wenchuan earthquake, a steel truss reinforced concrete beam and an outsourced U-shaped steel-concrete beam are proposed. Through three 1/2 “ Low cycle repeated load test to evaluate the seismic performance of the composite beams. The results show that the common reinforced concrete beams designed according to GB50010-2010 ”Code for Design of Seismic Design of Buildings" are prone to bends and shear failure, the bending damage of the built-in steel truss reinforced concrete beams and the outsourcing of U-shaped steel-concrete beams Bending slip damage. The seismic capacity of the built-in steel truss reinforced concrete beams and the outsourced U-shaped steel concrete beams are better than the ordinary reinforced concrete beams. Compared with common reinforced concrete beams, the bearing capacity, stiffness, ductility and energy dissipation capacity of the built-in steel truss reinforced concrete beams are all improved effectively. The bearing capacity, ultimate displacement angle and displacement ductility of the built-in steel truss beams Ordinary reinforced concrete beams were increased by 10%, 35% and 25%. The hysteretic curves of outsourcing U-shaped steel-concrete continuous beams are full, the ductility and energy dissipation properties are significantly improved, and the bearing capacity degenerates slowly. The ultimate displacement angle and displacement ductility of outsourcing U-shaped steel-concrete continuous beams are higher than that of ordinary reinforced concrete beams 27% and 61% respectively.