中文摘要：

为发展绿色、高效及可恢复功能的新型预制装配式桥梁结构体系,提出将钢管混凝土（CFST）应用于后张预应力节段预制拼装桥墩的结构形式。介绍了后张预应力节段拼装CFST桥墩关键构造、受力状态及力学行为特征,建立其关键部件设计方法。设计并加工制作了试验模型试件,开展了轴心后张预应力节段拼装CFST桥墩侧向往复加载拟静力试验,揭示了其水平往复加载过程中的滞回行为、骨架曲线、预应力损失、耗能能力、节段间接缝张口、节段间接缝滑移及塑性铰发展等非线性力学行为。研究结果表明：该后张预应力节段拼装CFST桥墩具有较高的抗侧能力和良好的自复位性能,侧向承载能力失效时残余偏移率为0.2%;水平往复位移将会造成较大的预应力损失,失效时即水平最大位移偏移率5.8%时,预应力损失约15%;节段预制拼装CFST墩柱出现双塑性铰效应,底部接缝开口较大,其上相邻接缝处开口量显著减小;试验后接缝处没有出现显著水平移位或错动现象,预制节段墩身没有出现明显外观损伤,底部接缝处应力集中区域钢管内少量混凝土破碎,导致钢管局部屈服;无附加耗能装置的后张预应力节段拼装桥墩耗能能力较差,建议在接缝开口处附设耗能装置。研究成果可为自复位预制拼装CFST桥墩设计和性能优化提供重要参考。

英文摘要：

To develop environmentally friendly, highly-efficient and resilient structure system, a novel type of post-tensioned segmental concrete-filled bridge pier columns was proposed. Key construction, load-bearing state and of the post-tensioned segmental CFST bridge pier columns were introduced, prefabricated bridge steel tubes （CFST） mechanical behavior and detail design of some key components were established. A testing specimen was designed and manufactured. Quasi-static lateral cyclic testing on the post-tensioned segmental CFST bridge pier column was performed to investigate and analyze the nonlinear mechanical behavior, including hysteresis loop, skeleton curve, tension loss, energy dissipation capacity, joint opening, joint sliding and expansion of plastic hinges. The results show that the post-tensioned segmental CFST bridge pier column can provide appropriate lateral bearing capacity and satisfactory self-centering ability, and the residual displacement drift is 0.2 % when lateral bearing capacity is lost. Tension loss is about 15% when the maximum lateral drift ratio reaches 5.8%. Double plastic hinge effect appears in the post-tensioned segmental CFST bridge pier column and the opening amount in bottom joint is notable, but the upper adjacent joint opening decreases significantly. There is no obvious horizontal dislocation or sliding between adjacent segments after the experiment and the damage is not observed in the segmental column while there is a small amount of concrete crushing near the bottom joint with stress concentration, causing steel pipe into yield state. Poor energy dissipation is revealed owing to no additional energy dissipater on the specimen, effective energy dissipation measures are recommended for post-tensioned segmental bridge piers. This research will provide significant references for design and performance optimization of post-tensioned segmental CFST bridge pier columns.