Abstract: Based on the basic requirements of current“Guidelines for Seismic Design of Highway Bridges”，the orthogonal quasi-static test of four factors at three different levels for circular reinforced concrete bridge columns had been designed． In the test program，force-displacement hysteretic curve and flexural deformation，shear deformation，bond-slip deformation by strain penetration contribute to the top displacement and the average curvature of section were the main test objects． The test results showed that the progression of flexual damage for all bridge columns were similar; the columns with low longitudinal reinforcements ratio and high axial load were influenced by a certain shearing mechanism，and the columns with longitudinal steel in small diameter could bear fewer numbers of cyclic loading when longitudinal steels fracture; uncompacted concrete vibrating in bottom area of bridge columns exerted adverse influence on the ductility capacity of bridge columns．

Key words: r /c bridge columns, orthogonal pseudo-static test, ductility capacity, experimental evaluation

摘要： 根据现行《公路桥梁抗震设计细则》的基本要求，设计了三水平、四因素圆形钢筋混凝土桥墩拟静力正交弯曲 破坏试验，并以墩顶力－ 位移滞回曲线、墩顶总位移的弯曲变形、剪切变形和应变渗透变形分量及截面平均曲率为 主要测试对象，进行了相应的试验研究。结果表明: 各桥墩的弯曲损伤破坏过程相似; 纵筋率较低，轴压比较高的 桥墩存在一定的剪切机制作用; 纵筋直径较小的桥墩在纵筋发生断裂时能承受的循环加载次数较少; 墩底区域混 凝土振捣不密实对桥墩延性能力的发挥有不利影响。

关键词: 钢筋混凝土桥墩, 拟静力正交试验, 延性能力, 试验评估