【摘要】 针对传统自复位桥墩耗能形式单一且内置耗能钢筋震后更换困难的问题，提出一种外置分阶段耗能阻尼器。首先介绍了阻尼器的基本结构与作用机理，并建立数值模型对其性能进行验证；然后考虑不同的软钢屈服强度，建立三个外置分阶段耗能阻尼器自复位桥墩模型与一个内置耗能钢筋自复位桥墩模型，通过拟静力滞回模拟试验对比研究软钢屈服强度对自复位桥墩抗震性能的影响规律。结果表明：与内置耗能钢筋自复位桥墩相比，外置分阶段耗能阻尼器自复位桥墩水平承载力最高提升22%，提高了桥墩初始刚度，减弱了桥墩刚度退化，且随着软钢屈服强度提高，桥墩的抗震性能相应增强。更多还原

【Abstract】 Aiming at the problem that the traditional self-resetting pier has a single energy consumption form and it is difficult to replace the built-in energy consuming reinforcement after earthquake,a external staged energy dissipation damper is proposed. Firstly,the basic structure and action mechanism of the damper are introduced,and a numerical model is established to verify its performance. Then,considering different mild steel yield strength,three self-resetting pier models with external dampers and one self-resetting pier model with internal energy dissipation reinforcements are established. The influence of mild steel yield strength on the seismic performance of self-resetting pier is compared through quasi-static hysteretic simulation test. The results show that compared with the self-resetting pier with internal energy dissipation reinforcement,the horizontal bearing capacity of the self-resetting pier with external phased energy dissipation damper is up to 22%,which improves the initial stiffness of the pier and weakens the stiffness degradation of the pier,and with the increase of mild steel yield strength,the seismic performance of the self-resetting pier is enhanced accordingly.更多还原