基于性能抗震设计的钢筋混凝土桥墩变形能力公式推导及应用

从Mander等人给出的约束混凝土应力——应变本构关系出发，根据实际应用情况进行适当地简化、推导，得出了矩形、圆形截面桥墩力学配箍率与桥墩轴压比、塑性铰的曲率延性系数及构件截面等因素的关系表达式，即变形能力公式。将该公式与25组试验数据、已有的相关研究成果及规范进行对比，证明了该公式的正确性及应用该公式得到的横向配筋水平。为方便应用，将桥墩的变形能力公式进行变换，得到了力学配箍率与桥墩的顶点位移延性系数、破损指标等因素的关系表达式，在此基础上，提出了基于性能的钢筋混凝土桥墩的设计方法，并给出应用该方法的工程实例分析过程，其结果在平均意义上与非线性时程分析结果吻合较好，进一步验证了公式的合理性。

Derivation and Application of Distortion Ability Formula for Performance-based Seismic Design Method of RC Bridge Piers

The restraint concrete stress-strain relation which from Mander et al was used through a series of proper reduction and derivation based on practical application,the distortion ability formulas of bridge piers with rectangular or circular section were expressed by the mechanical stirrup ratio,the axis-pressure ratio,the curvature ductility coefficient and the bridge pier area ratio,etc.Comparing the outcomes from the presented formulas to 25 groups of data from test,the correlation research outcomes and the...