钢管约束钢筋混凝土压弯构件抗震性能与设计方法

为研究钢管约束钢筋高强混凝土压弯构件的抗震性能和设计方法,进行圆钢管和方钢管约束钢筋高强混凝土压弯构件的滞回性能试验研究.试验结果表明,由于钢管对核心混凝土的有效约束,核心高强混凝土柱的承载力、延性和耗能能力得到显著提高.在轴压比和钢管径厚比相同的条件下,圆钢管约束钢筋混凝土压弯构件的抗弯承载力和延性明显优于方钢管约束钢筋混凝土.根据试验结果,建立钢管约束钢筋混凝土压弯构件的纤维模型方法和截面抗弯承载力计算方法,计算结果与试验结果吻合极好.

Seismic behavior and design method of tubed reinforced concrete (RC) beam-columns

The behavior of tubed RC beam-columns was experimentally studied to investigate the seismic behavior and design methodof tubed RC columns including circular tubed RC (CTRC) and square tubed RC (STRC) columns. The test results indicated that the CTRC and STRC columns with high axial load ratio exhibited much higher flexural strength, displacement ductility and greater energy dissipation ability than common RC columns in respect of the effective confinement of the tube to the core concrete. The moment strength and ductility of CTRC columns were higher than that of STRC columns with same axial load ratio and diameter-to-thickness ratio. The design method for steel tube confined RC beam-columns was proposed based on the test results. Fiber models were developed for the CTRC and STRC beam-columns. Excellent agreement was observed between the results from fiber model analysis and the experimental results.