| 带小直径纵筋并外包CFRP的RC圆墩抗震性能研究 |
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| 引用本文： | 薛俊青,DAVIDE Lavorato,聂尚杰,陈俊臻,BRISEGHELLA Bruno,NUTI Camillo.带小直径纵筋并外包CFRP的RC圆墩抗震性能研究[J].中国公路学报,2022,35(2):124-135. |
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| 作者姓名： | 薛俊青 DAVIDE Lavorato 聂尚杰 陈俊臻 BRISEGHELLA Bruno NUTI Camillo |
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| 作者单位： | 1. 福州大学 土木工程学院, 福建 福州 350108;2. 福州大学 福建省土木工程多灾害防治重点实验室, 福建 福州 350108;3. 罗马第三大学 建筑学院, 拉齐奥大区 罗马 00184 |
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| 基金项目： | 国家自然科学基金项目(51778148，51508103) |
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| 摘 要： | 桥梁震害调查显示,钢筋混凝土(RC)桥墩易受损,影响震后救援和灾后重建.采用小直径纵筋替换受损纵筋并外包碳纤维布(CFRP)的技术修复受损桥墩可缩短震后修复周期,节省重建费用.以某不规则连续梁桥的RC圆墩为工程背景,选择小直径纵筋的长度和直径、外包CFRP层数为参数,开展7根缩尺比例为1∶6的RC圆墩试件的拟静力试验;...
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| 关 键 词： | 桥梁工程 抗震性能 拟静力试验 钢筋混凝土圆形桥墩 小直径纵筋 碳纤维布 |
| 收稿时间： | 2020-10-27 |
Research on Seismic Behaviors of RC Circular Pier with Longitudinal Rebar of Reduced Diameter and CFRP Wrap |
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| XUE Jun-qing,DAVIDE Lavorato,NIE Shang-jie,CHEN Jun-zhen,BRISEGHELLA Bruno,NUTI Camillo.Research on Seismic Behaviors of RC Circular Pier with Longitudinal Rebar of Reduced Diameter and CFRP Wrap[J].China Journal of Highway and Transport,2022,35(2):124-135. |
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| Authors: | XUE Jun-qing DAVIDE Lavorato NIE Shang-jie CHEN Jun-zhen BRISEGHELLA Bruno NUTI Camillo |
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| Affiliation: | 1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China;2. Fujian Provincial Key Laboratory on Multi-disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China;3. Department of Architecture, Roma Tre University, Roma 00153, Lazio Region, Italy |
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| Abstract: | Investigations on the seismic damage of bridges after earthquakes indicate that reinforced concrete (RC) piers are easily damaged, which influences the rescue and reconstruction after earthquakes. Repairing damaged piers with the technology, which substitutes the damaged original longitudinal rebar using a longitudinal rebar with a reduced diameter (turned rebar) and envelops the RC piers with the carbon fiber reinforced polymer (CFRP), can shorten the repair period after earthquakes and reduce the reconstruction costs. The RC circular pier in a continuous girder bridge with irregular piers was selected as the case study. Quasi-static tests on seven RC circular pier specimens with a reduced scale factor of 1:6, considering the length and diameter of the turned rebar, and the layer of CFRP wrap as parameters were adopted. The finite element models were implemented using the OpenSees finite element software, and the accuracy was verified by the test results. Parametric analysis was performed using the finite element model. The results indicate that the plastic deformation of piers with the turned rebar was concentrated within its length, and the failure of piers was limited within the plastic hinge zone. Comparing the piers without the turned rebar, the load bearing capacity of piers with the turned rebar could decrease by 20%-27%; however, the displacement ductility, curvature ductility, and energy dissipation capacity increased by 42%-85%, 47%-242%, and 32%-56%, respectively. It was established that the turned rebar could effectively improve the seismic performance of piers when the load bearing capacity of piers satisfies the design requirements. The measured maximum strains of the CFRP wraps within the length of the turned rebar in the piers with the turned rebar, were significantly larger than those in the piers without the turned rebar. It can be concluded that the CFRP wraps could be chosen for piers with the turned rebar to prevent the premature failure of piers and improve the ductility. With an increase in the length of the turned rebar or a decrease in the diameter of the turned rebar, the energy dissipation capacity of the pier first increases and then decreases. Selecting the length of the turned rebar is proposed, considering the fatigue life of rebar as the lower limit and the length of the plastic hinge zone as the upper limit. The maximum diameter obtained, under the condition of ensuring that the stress of the longitudinal rebar outside the plastic hinge zone is always within the elastic range, can be considered as the diameter of the turned rebar. Using concrete with higher strength in the repair zone of the pier can increase the load bearing capacity of the pier with the turned rebar. |
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| Keywords: | bridge engineering reinforced concrete circular pier quasi-static test seismic behavior longitudinal rebar with reduced diameter carbon fiber reinforced polymer wrap |
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