Seismic capacity, including the ultimate load-carrying capacity and ultimate deformation capacity of precast segmental concrete double-column (PSCDC) piers with steel sleeve (SS) connection or grouted corrugated-metal duct (GCMD) connection, has been verified to be similar to those of cast-in-place (CIP) piers by quasi-static tests. However, the lack of knowledge of seismic response characteristics and damage process of PSCDC piers has limited their application in high-intensity seismic areas. Therefore, shake table tests, using variable types and intensities of seismic ground motions, were performed to investigate the seismic behavior of connection joints and to evaluate the seismic performance of PSCDC piers with SS and GCMD connections. Also, a finite element analysis (FEA) model was developed to study the influence of design parameters on the seismic behavior of the piers. The results showed that the main damage in PSCDC piers was caused by the cyclic opening and closing of connection joints. Under high-intensity ground motions, the PSCDC piers had a lower seismic performance than the CIP piers due to a significant decrease of their integrity and stiffness. The seismic performance of PSCDC piers is comparable to CIP piers when using an appropriate initial stress of the prestressing tendons.

中文翻译：

---

预制分段混凝土双柱墩的振动台研究

经过验证的抗震能力，包括带有钢套（SS）连接或注浆的波纹金属管（GCMD）连接的预制分段混凝土双柱（PSCDC）墩的极限承载力和极限变形能力，与以下各项相似：通过准静态测试的现浇（CIP）桥墩。但是，由于对PSCDC墩的地震反应特征和破坏过程缺乏了解，限制了它们在高强度地震区的应用。因此，使用可变类型和强度的地震地面运动进行了振动台测试，以研究连接节的地震行为，并评估具有SS和GCMD连接的PSCDC墩的抗震性能。也，建立了有限元分析（FEA）模型，以研究设计参数对桥墩抗震性能的影响。结果表明，PSCDC桥墩的主要破坏是由于连接缝的周期性开合引起的。在高强度地面运动下，PSCDC墩的抗震性能比CIP墩低，因为它们的完整性和刚度大大降低。当使用适当的预应力筋初始应力时，PSCDC墩的抗震性能可与CIP墩相媲美。由于PSCDC墩的完整性和刚度大大降低，因此其抗震性能低于CIP墩。当使用适当的预应力筋初始应力时，PSCDC墩的抗震性能可与CIP墩相媲美。由于PSCDC墩的完整性和刚度大大降低，因此其抗震性能低于CIP墩。当使用适当的预应力筋初始应力时，PSCDC墩的抗震性能可与CIP墩相媲美。