Abstract

Seismic performance evaluation is carried out for reinforced concrete bridge columns using both normal (SD400) and high (SD700) yield strength of reinforcement. A total of 12 column specimens are tested under lateral load reversals. Primary design parameters are types of cross-section, yield strength of both longitudinal and lateral reinforcements, longitudinal reinforcement ratio, and vertical spacing of lateral reinforcement. Lateral force-displacement hysteretic response reveals that experimental lateral forces are well above code-specified lateral forces in overall displacement range. Specimens using SD700 show higher lateral force carrying capacity than those with SD400. On the other hand, specimens using SD400 exhibit more ductile behaviour than those with SD700. Deformation capacity is also investigated in terms of displacement ductility and cumulative energy dissipation. Whereas experimental ductility values are in general greater than code-specified values, margin of safety is slightly reduced as yield strength and longitudinal reinforcement ratio increase. It is thus believed that use of SD700 in reinforced concrete columns seems to be promising.

摘要

钢筋混凝土桥柱的抗震性能评价采用钢筋的正常（SD400）和高（SD700）屈服强度。总共有 12 个柱试样在横向载荷反转下进行了测试。主要设计参数是横截面类型、纵向和横向钢筋的屈服强度、纵向钢筋比和横向钢筋的垂直间距。横向力-位移滞后响应表明，在整个位移范围内，实验横向力远高于代码指定的横向力。使用 SD700 的样本显示出比使用 SD400 的样本更高的侧向力承载能力。另一方面，使用 SD400 的试样比使用 SD700 的试样表现出更多的延展性。变形能力也在位移延性和累积能量耗散方面进行了研究。虽然试验延展性值通常大于规范规定的值，但随着屈服强度和纵向配筋率的增加，安全裕度会略微降低。因此，相信在钢筋混凝土柱中使用 SD700 似乎很有希望。