Shake Table Studies and Analysis of a PT-UHPC Bridge Column with Pocket Connection
Shake Table Studies and Analysis of a PT-UHPC Bridge Column with Pocket Connection
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DOI：
10.1061/(asce)st.1943-541x.0001997
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发表时间：
2018-04-01
影响因子：
4.1
通讯作者：
Itani, Ahmad M.
中科院分区：
文献类型：
--
作者：
Mohebbi, Alireza;Saiidi, M. Saiid;Itani, Ahmad M.
本研究对通过袋连接连接到预制基础的大型新型后张 (PT) 预制桥柱进行振动台研究和分析。主要目标是开发一种弹性方形预制桥柱，在遭受强震时，残余侧向位移和塑性铰损坏最小。另一个目标是评估柱基凹座连接。该柱采用非粘合碳纤维增强聚合物 (CFRP) 筋进行后张处理，以消除永久性漂移。为了减轻地震损坏，柱的塑性铰区使用了超高性能混凝土（UHPC）。该柱模型经受了 1994 年 Northridge-Rinaldi 地震记录，其振幅不断增加，直至失效。实验结果表明，柱的位移比和位移延性能力分别为6.9%和13.8%，残余位移可以忽略不计。此外，袋状连接可有效地在柱中形成塑料铰链，而不会损坏连接。该研究的另一个发现是，可用的纤维元件模型导致测量的响应和计算的响应之间存在密切的相关性。
This study conducts shake table studies and analysis of a large-scale novel posttensioned (PT) precast bridge column connected to a precast footing with a pocket connection. The primary objective is to develop a resilient square precast bridge column with minimal residual lateral displacement and plastic hinge damage when subjected to strong earthquakes. Another objective is to evaluate a column-footing pocket connection. The column is posttensioned with unbonded carbon fiber-reinforced polymer (CFRP) tendons to eliminate permanent drifts. To mitigate seismic damage, ultra-high performance concrete (UHPC) is used in the plastic hinge zone of the column. The column model is subjected to the 1994 Northridge-Rinaldi earthquake record with increasing amplitudes until failure. Experimental results show that the drift ratio and displacement ductility capacity of the column are 6.9 and 13.8%, respectively, and the residual displacement is negligible. Furthermore, the pocket connection is effective in forming the plastic hinge in the column with no connection damage. Another finding of the study is that available fiber element models lead to close correlation between the measured and calculated responses.