| 自修复SMA/ECC复合材料加固RC梁受弯性能试验研究 |
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| 引用本文： | 钱辉,陈程,张庆元,康莉萍,赵军.自修复SMA/ECC复合材料加固RC梁受弯性能试验研究[J].工程力学,2023,40(6):73-84. |
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| 作者姓名： | 钱辉 陈程 张庆元 康莉萍 赵军 |
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| 作者单位： | 1.郑州大学土木工程学院，河南，郑州 450001 |
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| 基金项目： | 国家自然科学基金项目(51987631，51478438) |
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| 摘 要： | 为了提高既有RC构件的承载能力、损伤自修复能力，提升其安全与使用性能，该文提出采用超弹性形状记忆合金(Shape memory alloy,简称SMA)和工程水泥基复合材料(Engineered cementitious composites,简称ECC)复合加固钢筋混凝土梁的方法。设计并制作了4种试验梁以对比不同增强材料加固效果，通过低周单向循环加载试验，分析了不同材料加固试验梁的破坏形态、承载力、耗能性能和自修复能力等性能的影响。研究结果表明：SMA/ECC复合加固梁不仅提高了承载能力，且具有较好的延性和变形能力，同时具有优越的自修复性能。考虑ECC拉伸应变硬化特性，建立了ECC加固梁的受弯承载力计算方法，且计算值与试验值吻合较好。
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| 关 键 词： | 形状记忆合金 工程水泥基复合材料 增大截面法 抗震加固 受弯性能 |
| 收稿时间： | 2021-11-09 |
EXPERIMENTAL STUDY ON FLEXURAL BEHAVIOR OF RC BEAM STRENGTHENED WITH SELF-REPAIRING SMA/ECC COMPOSITES MATERIALS |
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| Affiliation: | 1.School of Civil Engineering, Zhengzhou University, Zhengzhou, He’nan 450001, China2.School of Civil Engineering and Architecture, Zhengzhou University of Aeronautics, Zhengzhou, He’nan 450046, China |
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| Abstract: | In order to improve the bearing capacity and damage self-repairing capacity as well as the safety and serviceability of existing RC members, a reinforcing method for strengthening RC beams using Shape Memory Alloy (SMA) and Engineered Cementitious Composites (ECC) was proposed. Four kinds of test beams were designed and fabricated, and the effects of different materials on the failure modes, bearing capacity, energy dissipation and self-repairing capability of the experimental beams were analyzed through the low-cycle cyclic loading test. The results show that SMA/ECC composite reinforced beam has significantly improved the bearing capacity, the ductility and deformation capacity as well as the self-repairing capability. Finally, by considering the ECC tensile strain hardening characteristics, a calculation method of the flexural capacity of ECC reinforced beams was proposed, and the calculated results were in good agreement with the experimental data. |
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