登录
注册
E-alert
登录
注册
E-alert
Feasibility Research on Strengthening Damaged Steel Structure with Self-Stress SMA
-
摘要: 为提高钢结构疲劳裂纹的加固效率,将形状记忆合金(SMA)作为预应力的载体引入加固方案。首先,分别对两种不同材质的形状记忆合金(NiTiNb-SMA和Fe-SMA)的力学性能和热力学性能进行试验研究,确定材料的弹性模量、抗拉强度等力学参数,研究其加热恢复性能,并确定其应用于试件加固时的最佳尺寸参数和激活温度。然后通过有限元方法分析了止裂孔法、CFRP布粘贴加固止裂孔法、NiTiNb-SMA及CFRP粘贴加固止裂孔法和Fe-SMA粘贴加固止裂孔法对损伤钢板加固的修复效率,最后通过静载试验验证数值模型的可靠性。研究结果表明:NiTiNb-SMA和Fe-SMA材料的本构关系存在较大差异,NiTiNb-SMA的力学性能参数高于Fe-SMA。NiTiNb-SMA材料在室温和高温条件下的应力应变历程有较大差别,但弹性模量和抗拉强度接近;在激活温度为170℃下,NiTiNb-SMA的恢复应力为274 MPa,高出Fe-SMA约96 MPa。对比止裂孔法,有限元结果表明CFRP、NiTiNb-SMA及CFRP复合贴片和Fe-SMA的加入能使孔边应力集中处的应力分别降低58.8%、87.0%和122.4%,静载试验结果表明实测结果与有限元结果总体上线性吻合较好,因此通过形状记忆合金引入预应力对加固损伤钢结构具有广阔的应用前景。Abstract: In order to improve the reinforcement efficiency of fatigue cracks in steel structures, shape memory alloy (SMA) was introduced as a prestressed carrier into the strengthening scheme. First, the mechanical properties and thermodynamic properties of two different shape memory alloys (NiTiNb-SMA and Fe-SMA) were tested to determine the material’s elastic modulus, tensile strength and other mechanical parameters, the heating recovery performance was also investigated, and its optimal size parameters and activation temperature when applied to repair were determined. Then, the finite element method was used to analyze the repair efficiency of the stop-hole method, CFRP patched stop-hole method, NiTiNb-SMA and CFRP patched stop-hole method to strengthen damaged steel plates. Finally, the reliability of the model was verified by static load test. Research results showed that there was a large difference in the constitutive relations between NiTiNb-SMA and Fe-SMA materials, and the mechanical properties of NiTiNb-SMA were higher than those of Fe-SMA.The stress-strain behavior of NiTiNb-SMA material at room temperature and high temperature was quite different, but the elastic modulus and tensile strength were nearly close.At an activation temperature of 170 ℃, the recovery stress of NiTiNb-SMA was 274 MPa, which was about 96 MPa higher than that of Fe-SMA. Compared with the stop-hole method, the finite element results showed that the addition of CFRP, NiTiNb-SMA and CFRP composite patches, and Fe-SMA could reduce the stress at the edge of the hole by 58.8%, 87.0% and 122.4%, respectively. The test results and FEM results were generally in good agreement with the linearity. It is indicated that the shape memory alloy has broad application prospects for strengthening damaged steel structures by introducing prestressing force.
-
Key words:
- shape memory alloy /
- self-stress /
- test /
- mechanical properties /
- strengthening
-
[1] 杨仕力,施洲.我国大跨径钢箱梁桥正交异性板疲劳损伤研究现状[J]. 桥梁建设, 2017,47(4):60-65. [2] 吴冲,刘海燕,张志宏,等.桥面铺装温度对正交异性钢桥面板疲劳的影响[J].同济大学学报(自然科学版),2013,41(8):1213-1218. [3] 杨佑发,陈前,雷鸣.在役钢结构吊车梁疲劳可靠性分析[J].振动与冲击,2020,39(9):165-172,193. [4] ŽELJKO D. Comparison of fatigue crack retardation methods[J]. Engineering Failure Analysis, 1996, 3(2):137-147. [5] TAVAKKOLIZADEH M, SAADATMANESH H. Fatigue strength of steel girders strengthened with carbon fiber-reinforced polymer patch[J]. Journal of Structural Engineering, 2003, 129(2):186-196. [6] 彭福明,岳清瑞,郝际平,等. 碳纤维增强复合材料(CFRP)加固修复损伤钢结构[J].工业建筑,2003,33(9):7-10,28. [7] 郑云,叶列平,岳清瑞.CFRP加固疲劳损伤钢结构的断裂力学分析[J].工业建筑,2005,35(10):79-82. [8] 郑云,叶列平,岳清瑞.CFRP板加固含裂纹受拉钢板的疲劳性能研究[J].工程力学,2007(6):91-97. [9] LEPRETRE E, CHATAIGNER S, DIENG L, et al. Fatigue strengthening of cracked steel plates with CFRP laminates in the case of old steel material[J]. Construction and Building Materials, 2018, 174:421-432. [10] EMDAD R, AL-MAHAIDI R. Effect of prestressed cfrp patches on crack growth of centre-notched steel plates[J]. Composite Structures, 2015, 123:109-122. [11] GHAFOORI E, HOSSEINI A, AL-MAHAIDI R, et al. Prestressed CFRP-strengthening and long-term wireless monitoring of an old roadway metallic bridge[J]. Engineering Structures, 2018, 176:585-605. [12] JANI J M, LEARY M, SUBIC A, et al. A review of shape memory alloy research, applications and opportunities[J]. Materials and Design, 2014(56):1078-1113. [13] 左晓宝, 李爱群, 倪立峰, 等. 超弹性形状记忆合金丝(NiTi)力学性能的试验研究[J]. 土木工程学报, 2004(12):12-18. [14] NEMAT-NASSER S, GUO W G. Superelastic and cyclic response of NiTi SMA at various strain rates and temperatures[J]. Mechanics of Materials, 2006, 38(5):463-474. [15] 王伟,邵红亮.不同直径NiTi形状记忆合金棒材的超弹性试验研究[J].结构工程师,2014,30(3):168-174. [16] EL-TAHAN M, DAWOOD M, SONG G. Development of a self-stressing NiTiNb shape memory alloy (SMA)/fiber reinforced polymer (FRP) patch[J]. Smart Materials and Structures, 2015, 24(6):1-21. [17] DONG Z, KLOTZ U E, LEINENBACH C, et al. A novel Fe-Mn-Si shape memory alloy with improved shape recovery properties by VC precipitation[J]. Advanced Engineering Materials, 2009,11(1/2):40-44. [18] GHAFOORI E, HOSSEINI E, LEINENBACH C, et al. Fatigue behavior of a Fe-Mn-Si shape memory alloy used for prestressed strengthening[J]. Materials and Design, 2017,133:349-62. [19] ZHANG C S, ZHAO L C, DUERIG T W, et al. Effects of deformation on the transformation hysteresis and shape memory effect in a Ni47ti44nb9 alloy[J]. Scripta Metallurgica Et Materialia, 1990, 24(9):1807-1812. [20] MIYAZAKI S, IMAI T, IGO Y, et al. Effect of cyclic deformation on the pseudoelasticity characteristics of Ti-Ni alloys[J]. Metall Trans A, 1986, 17(1):115-120. [21] 陈翔. 镍钛铌形状记忆合金特性的试验与本构模型研究[D]. 重庆:重庆大学,2016. [22] LEE W J, WEBER B, FELTRIN G, et al. Phase transformation behavior under uniaxial deformation of an Fe-Mn-Si-Cr-Ni-VC shape memory alloy[J]. Materials Science & Engineering A, 2013, 581(10):1-7. 期刊类型引用(5)
1. 罗杰，李维维，任瑞，黄宗辉，熊添祥，杨华山，李源嘉，甘政权. 喷射混凝土力学性能及微观结构研究. 水电能源科学. 2025(01): 84-88 . 
百度学术2. 贾静恩，张彬. 扰动荷载下聚丙烯纤维喷射混凝土力学性能研究. 复合材料科学与工程. 2023(06): 73-79+94 . 百度学术3. 杨国利. 利用纤维增强喷射混凝土对隧道进行初步衬砌. 水利科学与寒区工程. 2022(04): 123-127 . 百度学术4. 陶卓. 隧道初支喷射混凝土回弹率控制研究. 科学技术创新. 2022(18): 94-97 . 百度学术5. 王永. 基于纤维增强的隧道喷射混凝土回弹控制研究. 合成纤维. 2022(12): 69-73 . 百度学术其他类型引用(6)
-
点击查看大图
计量
- 文章访问数: 123
- HTML全文浏览量: 6
- PDF下载量: 0
- 被引次数: 11
下载:
