钱辉, 邱培凡, 金光耀, 郜新军, 冯大阔. 功能自恢复SMA/ECC墩柱抗震性能试验研究[J]. 工程力学, 2023, 40(4): 172-183. DOI: 10.6052/j.issn.1000-4750.2021.10.0791
引用本文: 钱辉, 邱培凡, 金光耀, 郜新军, 冯大阔. 功能自恢复SMA/ECC墩柱抗震性能试验研究[J]. 工程力学, 2023, 40(4): 172-183. DOI: 10.6052/j.issn.1000-4750.2021.10.0791
QIAN Hui, QIU Pei-fan, JIN Guang-yao, GAO Xin-jun, FENG Da-kuo. EXPERIMENTAL STUDY ON SEISMIC BEHAVIOR OF SELF-CENTERING SMA/ECC BRIDGE PIER[J]. Engineering Mechanics, 2023, 40(4): 172-183. DOI: 10.6052/j.issn.1000-4750.2021.10.0791
Citation: QIAN Hui, QIU Pei-fan, JIN Guang-yao, GAO Xin-jun, FENG Da-kuo. EXPERIMENTAL STUDY ON SEISMIC BEHAVIOR OF SELF-CENTERING SMA/ECC BRIDGE PIER[J]. Engineering Mechanics, 2023, 40(4): 172-183. DOI: 10.6052/j.issn.1000-4750.2021.10.0791

功能自恢复SMA/ECC墩柱抗震性能试验研究

EXPERIMENTAL STUDY ON SEISMIC BEHAVIOR OF SELF-CENTERING SMA/ECC BRIDGE PIER

  • 摘要: 墩柱作为主要承重构件,其抗震能力对整个桥梁结构的安全至关重要。为了提高墩柱的变形能力、耗能能力及损伤自修复能力,减小墩柱震后的残余变形和损伤,实现震后不修复或者稍作修复就可恢复正常功能,提出了一种基于形状记忆合金(Shape memory alloy, SMA)和工程水泥基复合材料(Engineered cementitious composites, ECC)的新型自复位墩柱。利用SMA的超弹恢复性能,在墩柱的塑性铰区用SMA筋来替代普通纵向钢筋,来实现墩柱的自复位功能;利用ECC的应变硬化特性,ECC替代墩柱的塑性铰区普通混凝土,提高墩柱耗能能力并减少损伤。设计制作了5个试验试件,分别为普通钢筋混凝土墩柱、普通钢筋ECC墩柱、钢绞线普通混凝土墩柱、钢绞线ECC墩柱和形状记忆合金筋ECC墩柱,并进行低周反复加载试验,对比分析了不同墩柱的破坏模式、承载力、延性和耗能能力等抗震性能。研究结果表明:SMA材料能够增强结构的变形能力,提高结构的延性,减小结构残余变形;ECC材料能够提高结构延性,减缓裂缝的开展速度,提高结构的耗能能力。与普通钢筋混凝土墩柱相比,SMA/ECC墩柱不仅表现出较好的延性,且构件复位效果良好,显著减小了结构损伤,展现出更好的抗震性能。

     

    Abstract: The seismic capability of pier column is important to the safety of the whole bridge structure. To reduce residual deformation and damage, and to resume normal functions with no or minimal repair after earthquake, an innovative pier column with self-centering capability based on Shape Memory Alloy (SMA) and Engineering Cement Composite (ECC) was proposed. In the plastic hinge zone of the self-centering pier column, the longitudinal reinforcements and concrete were replaced by SMA bars and ECC. Therefore, the self-centering capability of the pier column can be achieved through SMA with the energy dissipation capacity being improved. Damage of pier column can be reduced by ECC with strain hardening characteristics. Five specimens were produced, i.e., ordinary reinforced concrete bridge pier (R/C-BP), reinforced ECC bridge pier (R/ECC-BP), steel strands reinforced bridge pier (SS/C-BP), steel strands reinforced ECC bridge pier (SS/ECC-BP), and SMA reinforced ECC bridge pier (SMA/ECC-BP). Based on low cyclic loading tests, the failure characteristics, bearing capacity, ductility and energy dissipation capability of pier column specimens were analyzed. The test results show that the SMA material can effectively enhance the displacement ductility coefficient and improve the ductility performance of the structure, and can reduce the residual deformation of the structure. The ECC material can significantly improve the ductility of the structure and reduce the speed of cracking and increase the energy dissipation capacity of the structure. Compared with the ordinary specimen, SMA-ECC pier column was less damaged with remarkable self-centering capability. Furthermore, it also exhibit excellent ductility and seismic performance.

     

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