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桥墩是桥梁抗侧力体系中的关键构件。为实现基于概率和性能的桥梁抗震设计的多级性能目标,有必要给出桥墩在不同性能极限状态下的概率能力。基于已有研究工作,将RC桥墩的抗震性能水平划分为五个等级,并定义了相应的性能极限状态。采用等效集中塑性铰理论,推导并建立了各性能极限状态下RC墩柱变形能力的确定性计算公式;基于183个矩形RC墩柱试件的拟静力试验结果,通过多元回归分析,确定了各计算公式中与轴压比、长细比和配箍特征值等设计参数相关的待定系数。基于确定性计算模型和拟静力试验结果,考虑认知不确定性,建立了矩形RC墩柱变形能力的概率模型。通过实例分析,表明该模型可用于基于概率和性能的桥梁抗震设计和抗震评估。
Bridge piers are the key components in the bridge's anti-lateral force system. In order to realize the multi-level performance target of seismic design of bridges based on probability and performance, it is necessary to give the probability capability of piers under different performance limits. Based on the existing research work, the seismic performance of RC pier is divided into five levels, and the corresponding performance limit state is defined. Based on the equivalent central plastic hinge theory, the deterministic formula for the deformation capacity of RC pier under various performance limits was deduced and established. Based on the pseudo-static test results of 183 rectangular RC pier specimens, by multivariate regression analysis, In each calculation formula, the undetermined coefficients related to the design parameters such as axial compression ratio, slenderness ratio, and bail characteristic value are calculated. Based on the deterministic calculation model and the quasi-static test results, considering the cognitive uncertainty, a probabilistic model of rectangular RC pier deformation capacity was established. The case study shows that the model can be used in seismic design and seismic evaluation of bridges based on probability and performance.