中文摘要：

双层钢箱—混凝土组合墩柱（DSCB墩柱）是一种具有良好的抵御＂多灾害＂能力的新型桥梁墩柱截面形式,鉴于耗能能力是结构或构件抵抗地震的一个重要性能,而黏滞阻尼又是表征构件耗能特性的关键参数,为了解该新型墩柱在双向地震作用下的耗能和阻尼特点,通过对11根DSCB墩柱的水平单、双向拟静力试验,研究该新型桥梁墩柱的耗能能力及等效黏滞阻尼系数。试验结果表明：DSCB墩柱具有远超同截面尺寸钢筋混凝土箱型墩的耗能能力;DSCB墩柱的双向累积滞回耗能和位移延性存在相关关系,给出的正则化耗能与位移延性的关系式可为估算墩柱的耗能能力使用;由于双向耦合作用,弱轴的滞回环出现拓宽,因此双向地震作用下弱轴的等效黏滞阻尼大于单向地震作用下弱轴的等效黏滞阻尼。

英文摘要：

Double-skin steel-concrete composite box piers（ DSCB） for bridges is a new approach of resisting multidisasters. Energy dissipation is a fundamental property of structures or structural members when subjected to seismic conditions,while viscous damping is the key coefficient when analyzing the energy dissipation capacity of a structure or a structural member. In order to study the energy dissipation and damping properties of these new piers under bidirectional seismic load,11 DSCB piers were tested under cyclic loading with uniaxial and biaxial quasistatic testing method. The test result indicates that the energy dissipation capacity of DSCB piers is much higher than that of RC piers with rectangular hollow cross-sections; the biaxial cumulative hysteretic energy dissipation has a relationship with the displacement ductility,and the relationship can be used for the estimation of energy dissipation; because of the biaxial coupling effects of the bi-directional seismic loading,the equivalent viscous damping of minor axis is larger than that of uniaxial earthquake loading.