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针对钢筋混凝土(RC)矩形空心桥墩基于性能抗震设计所需要的性能量化参数和抗震性能问题,该文对高宽比、轴压比、纵向和横向配筋率不同的12个约束良好的RC矩形空心桥墩,开展了恒定轴力作用下的水平循环荷载试验研究,并把试验观测到的桥墩主要损伤状态与工程设计参数联系起来,以满足基于性能抗震设计所需要的量化指标。在此基础上,基于Open Sees软件平台,采用纤维模型对试件体桥墩的滞回性能进行数值模拟,模拟结果与试验数据吻合良好。结果表明:使用累积概率曲线,可以较好地把混凝土开裂和剥落等主要损伤状态与混凝土压应变和纵向钢筋拉应变等工程极限状态联系起来,为基于性能的桥梁抗震设计提供量化指标。试件体桥墩的延性系数在3.71~8.29,等效粘滞阻尼比在0.19~0.31,延性系数和耗能指标均满足结构抗震设计要求。该横向配筋构型的RC矩形空心桥墩,可以作为当前我国公路桥梁抗震设计细则(JTG/T B02-01-2008)矩形空心截面横向配筋构型的一种补充。
In order to solve the performance parameters and seismic performance requirements of RC rectangular hollow piers based on performance seismic design, 12 constrained RC rectangles with different aspect ratio, axial compression ratio and longitudinal and transverse reinforcement ratios Hollow pier, the horizontal cyclic loading test under constant axial force is carried out, and the main damage state of bridge piers observed by the test is linked with the engineering design parameters to meet the quantitative indexes required by performance-based seismic design. On this basis, based on the Open Sees software platform, the fiber model was used to simulate the hysteretic behavior of the bridge piers. The simulation results are in good agreement with the experimental data. The results show that the cumulative probability curve can be used to link the major damage states such as cracking and exfoliation of concrete with the ultimate state of engineering such as concrete compressive strain and longitudinal tensile strain, and to provide quantitative indexes for the performance-based seismic design of bridges. The ductility coefficient of specimen pier is 3.71 ~ 8.29, the equivalent viscous damping ratio is 0.19 ~ 0.31, ductility coefficient and energy consumption index all meet the requirements of structural seismic design. The RC rectangular hollow pier with transverse reinforcement can be used as a supplement to the horizontal reinforcement configuration of the rectangular hollow section of China's current road bridge seismic design rules (JTG / T B02-01-2008).