【摘要】 无黏结预应力节段拼装钢管混凝土桥墩主要包括承插连接与混合连接两种承台连接方式。为比较两种不同连接构造下桥墩的地震响应特点，采用OpenSees软件分别建立了桥墩有限元模型，其中，承插连接钢管混凝土桥墩模型能够考虑插入承台部分钢管与周围混凝土的黏结滑移、钢管局部屈曲以及屈曲后撕裂等过程，而混合连接钢管混凝土桥墩模型能够再现出接缝的摇摆行为；并通过与相关拟静力试验数据结果进行对比，验证了两种数值模型的有效性；随后，以一座4跨连续梁桥为背景，分别研究了采用混合连接、无预应力承插连接和预应力承插连接桥墩桥梁结构在地震作用时的响应特点。结果表明：两种承插连接桥墩的墩底钢管在地震动峰值加速度(peak ground acceleration, PGA)约0.4g时发生屈曲，并伴随水平刚度下降和残余位移增大，且配置无黏结预应力的承插连接桥墩钢管屈曲引起的损伤程度更大，随着地震动输入进一步增大，预应力为桥墩提供的自复位能力逐步增加，在PGA=0.6g时，预应力承插连接桥墩的残余位移仅为无预应力桥墩的62%。此外，配置混合连接桥墩的桥梁在地震作用下损伤较小，残余漂移比小于0.2%,比承插连接桥墩更优的自复位能力。更多还原

【Abstract】 Non-bonded prestressed segmental assembled concrete filled steel tube columns mainly include two types of platform connection methods of socket connection(SC) and hybrid connection(HC). Here, to compare seismic response characteristics of bridge piers under two different connection constructions, the software OpenSees was used to establish bridge pier finite element models. In them, the SC model could consider bonding slip between part of steel tube inserting platform and surrounding concrete, local buckling of steel tube and post-buckling tearing process, while the HC model could reproduce swinging behavior of joints. Through comparing finite element simulation results with relevant quasi-static test data results, the effectiveness of 2 numerical models was verified. Then, taking a 4-span continuous beam bridge as the background, seismic response characteristics of bridge structure and piers using hybrid connections, non-prestressed socket connections and prestressed socket connections under earthquake action were studied. The results showed that steel tubes at pier bottom of two types of socket connected bridge piers have buckling when peak ground acceleration(PGA) is about 0.4g accompanied by decrease in horizontal stiffness and increase in residual displacement; damage degree caused by buckling of steel tubes in socket connected bridge piers with unbonded prestressing is larger; with increase in ground motion input, the self-resetting ability provided by prestressing for bridge piers gradually increases; when PGA=0.6g, residual displacement of prestressed socket connected bridge piers is only 62% of that of non-prestressed bridge piers; in addition, bridges equipped with hybrid connection piers have less damage under seismic action, their residual drift ratio is less than 0.2%, they have better self-resetting ability than those equipped with socket connection piers.更多还原