预制拼装混凝土桥墩抗震性能拟静力循环加载试验
Experiment on Seismic Behavior of Precast Segmental Concrete ？？Bridge Piers Under Quasi Static Cyclic Loading

为了研究预制拼装桥墩与整体现浇桥墩抗震性能方面的差异，以常见城市高架桥为工程背景，制作完成了3个缩尺比为1∶3.5的试件模型，进行了整体现浇桥墩和无粘结预应力钢绞线预制拼装桥墩拟静力循环加载试验。通过给墩顶施加强迫往复位移，从5个方面研究了预制拼装桥墩与整体现浇桥墩抗震性能的差别，并对试验结果进行了纤维模型计算分析。结果表明：无粘结预应力预制拼装混凝土桥墩混凝土破坏轻微，耗能能力较弱，残余位移小，适合低烈度地区；无粘结预应力带耗能钢筋预制拼装混凝土桥墩墩底混凝土有明显压碎，耗能能力强，残余位移相对于钢筋混凝土现浇桥墩较小，适合中高烈度地区。
In order to study the difference of seismic behavior of precast segmental bridge piers and integral cast in？？situ bridge piers, three 1∶3.5 scale specimens were fabricated according to the urban viaduct bridge practice. The integral cast in？？situ and unbonded prestress precast segmental bridge pier specimens were used for quasi static cyclic loading test. The seismic behavior differences of precast segmental bridge pier and integral cast in？？situ bridge pier were investigated in five aspects through imposing cyclic displacement on the column top. The test results were also compared with fiber model calculation results. The results show that the unbonded prestressing precast segmental concrete piers have minor damage, lower energy dissipation, little residual displacement, and are fitted for low earthquake intensity area. The unbonded prestressing precast segmental concrete piers with energy dissipation bars show obvious concrete crush, higher energy dissipation, relatively lower residual displacement compared with monolithic reinforced steel concrete piers, and are fitted for moderate to high earthquake intensity area