疲劳损伤锈蚀预应力混凝土梁受力性能研究
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摘要
对经历不同疲劳加载历程的锈蚀预应力混凝土梁进行静力加载,研究了疲劳损伤锈蚀预应力混凝土梁的受力性能。采用三维激光扫描技术获得了锈蚀预应力筋几何模型。试验结果表明:不均匀锈蚀诱发预应力筋在截面积最小且存在明显锈坑处发生脆性断裂;疲劳损伤后锈蚀预应力混凝土梁初始刚度发生退化,变形能力明显降低,具有脆性破坏特征;随疲劳损伤程度的增加,锈蚀预应力钢丝的变形能力降低;普通钢筋屈服平台缩短,极限应变降低。
An experimental study was performed on the structural behavior of corroded pretensioned prestressed concrete beams subjected to high-cycle fatigue loading. A three-dimensional laser scanning technique was employed to obtain the geometric models of corroded prestressing wires. It is observed that the prestressing wires fracture at the smallest cross-section where the corrosion pits have formed. The initial stiffness of corroded prestressed concrete beams dramatically decreases after cyclic loading, its cracking load is close to the ultimate load, and the beams exhibite a trend of brittle failure. With increased cycle ratios, significant reduction is found in the ultimate strain of corroded prestressing wires. The ductility of rebars is sensitive to high-cycle fatigue loading, and the post-yield branch becomes shorter with increased fatigue damage.
An experimental study was performed on the structural behavior of corroded pretensioned prestressed concrete beams subjected to high-cycle fatigue loading. A three-dimensional laser scanning technique was employed to obtain the geometric models of corroded prestressing wires. It is observed that the prestressing wires fracture at the smallest cross-section where the corrosion pits have formed. The initial stiffness of corroded prestressed concrete beams dramatically decreases after cyclic loading, its cracking load is close to the ultimate load, and the beams exhibite a trend of brittle failure. With increased cycle ratios, significant reduction is found in the ultimate strain of corroded prestressing wires. The ductility of rebars is sensitive to high-cycle fatigue loading, and the post-yield branch becomes shorter with increased fatigue damage.
引文
[1] American Society of Civil Engineers (ASCE). Report card for America’s infrastructure[R].Reston:ASCE,2017.
[2] CEB-FIP. Durability of post-tensioning tendons[R]. Lausanne: fib, 2005.
[3] ACI Committee 222.Corrosion of prestressing steels[R].Farmington Hills:American Concrete Institute,2010.
[4] ZHANG W P, ZHOU B B, GU X L, DAI H C. Probability distribution model for cross-sectional area of corroded reinforcing steel bars[J]. Journal of Materials in Civil Engineering, 2014, 26(5): 822-832.
[5] DARMAWAN M S, STEWART M G. Effect of pitting corrosion on capacity of prestressing wires[J]. Magazine of Concrete Research,2010,59(2):131-139.
[6] 曾严红,顾祥林,张伟平,黄庆华. 锈蚀预应力筋力学性能研究[J]. 建筑材料学报, 2013,13(2): 169-174.(ZENG Yanhong, GU Xianglin,ZHANG Weiping, HUANG Qinghua. Study on mechanical properties of corroed prestressed tendons[J]. Journal of Building Materials,2010,13(2):169-174.(in Chinese))
[7] LI S L, XU Y, LI H, GUAN X C. Uniform and pitting corrosion modeling for high-strength bridge wires[J]. Journal of Bridge Engineering, 2014, 19(7): 1-8.
[8] 李富民,袁迎曙,杜健民,马欢. 氯盐腐蚀钢绞线的受拉性能退化特征[J]. 东南大学学报(自然科学版), 2009, 39(2): 340-344. (LI Fumin, YUAN Yingshu, DU Jianmin, MA Huan. Deterioration of tensile behavior of steel strands corroded by chloride[J]. Journal of Southeast University (Natural Science Edition), 2009, 39(2): 340-344. (in Chinese))
[9] RINALDI Z, IMPERATORE S, VALENTE C. Experimental evaluation of the flexural behavior of corroded P/C beams[J]. Construction and Building Materials, 2010, 24(11): 2267-2278.
[10] CASTEL A, FRAN?OIS R, CORONELLI D. Response of corroded prestressed beams with bonded strands[J]. Proceedings of the ICE: Structures and Buildings, 2012, 165(5): 233-244.
[11] ZHANG W P, SONG X B, GU X L, LI S B. Tensile and fatigue behavior of corroded rebars[J].Construction and Building Materials,2012,34:409- 417.
[12] LI H, LAN C M, JU Y, JU Y, LI D S. Experimental and numerical study of the fatigue properties of corroded parallel wire cables[J]. Journal of Bridge Engineering, 2011, 17(2): 211-220.
[13] LIU X, ZHANG W, GU X, ZENG Yanhong. Degradation of mechanical behavior of corroded prestressing wires subjected to high-cycle fatigue loading[J]. Journal of Bridge Engineering, 2017, 22(5): 4017004.
[14] 易伟建,孙晓东. 锈蚀钢筋混凝土梁疲劳性能试验研究[J].土木工程学报,2007,40(3):6-10.(YI Weijian, SUN Xiaodong. Experimental investigation on the fatigue behavior of corroded RC beams[J]. China Civil Engineering Journal,2007,40(3):6-10.(in Chinese))
[15] ZHANG W P, LIU X G, GU X L. Fatigue behavior of corroded prestressed concrete beams[J]. Construction and Building Materials, 2016, 106: 198-208.
[16] ZHANG W, YE Z, GU X, et al. Assessment of fatigue life for corroded reinforced concrete beams under uniaxial bending[J]. Journal of Structural and Construction Engineering, 2017, 143(7): 4017048.
[2] CEB-FIP. Durability of post-tensioning tendons[R]. Lausanne: fib, 2005.
[3] ACI Committee 222.Corrosion of prestressing steels[R].Farmington Hills:American Concrete Institute,2010.
[4] ZHANG W P, ZHOU B B, GU X L, DAI H C. Probability distribution model for cross-sectional area of corroded reinforcing steel bars[J]. Journal of Materials in Civil Engineering, 2014, 26(5): 822-832.
[5] DARMAWAN M S, STEWART M G. Effect of pitting corrosion on capacity of prestressing wires[J]. Magazine of Concrete Research,2010,59(2):131-139.
[6] 曾严红,顾祥林,张伟平,黄庆华. 锈蚀预应力筋力学性能研究[J]. 建筑材料学报, 2013,13(2): 169-174.(ZENG Yanhong, GU Xianglin,ZHANG Weiping, HUANG Qinghua. Study on mechanical properties of corroed prestressed tendons[J]. Journal of Building Materials,2010,13(2):169-174.(in Chinese))
[7] LI S L, XU Y, LI H, GUAN X C. Uniform and pitting corrosion modeling for high-strength bridge wires[J]. Journal of Bridge Engineering, 2014, 19(7): 1-8.
[8] 李富民,袁迎曙,杜健民,马欢. 氯盐腐蚀钢绞线的受拉性能退化特征[J]. 东南大学学报(自然科学版), 2009, 39(2): 340-344. (LI Fumin, YUAN Yingshu, DU Jianmin, MA Huan. Deterioration of tensile behavior of steel strands corroded by chloride[J]. Journal of Southeast University (Natural Science Edition), 2009, 39(2): 340-344. (in Chinese))
[9] RINALDI Z, IMPERATORE S, VALENTE C. Experimental evaluation of the flexural behavior of corroded P/C beams[J]. Construction and Building Materials, 2010, 24(11): 2267-2278.
[10] CASTEL A, FRAN?OIS R, CORONELLI D. Response of corroded prestressed beams with bonded strands[J]. Proceedings of the ICE: Structures and Buildings, 2012, 165(5): 233-244.
[11] ZHANG W P, SONG X B, GU X L, LI S B. Tensile and fatigue behavior of corroded rebars[J].Construction and Building Materials,2012,34:409- 417.
[12] LI H, LAN C M, JU Y, JU Y, LI D S. Experimental and numerical study of the fatigue properties of corroded parallel wire cables[J]. Journal of Bridge Engineering, 2011, 17(2): 211-220.
[13] LIU X, ZHANG W, GU X, ZENG Yanhong. Degradation of mechanical behavior of corroded prestressing wires subjected to high-cycle fatigue loading[J]. Journal of Bridge Engineering, 2017, 22(5): 4017004.
[14] 易伟建,孙晓东. 锈蚀钢筋混凝土梁疲劳性能试验研究[J].土木工程学报,2007,40(3):6-10.(YI Weijian, SUN Xiaodong. Experimental investigation on the fatigue behavior of corroded RC beams[J]. China Civil Engineering Journal,2007,40(3):6-10.(in Chinese))
[15] ZHANG W P, LIU X G, GU X L. Fatigue behavior of corroded prestressed concrete beams[J]. Construction and Building Materials, 2016, 106: 198-208.
[16] ZHANG W, YE Z, GU X, et al. Assessment of fatigue life for corroded reinforced concrete beams under uniaxial bending[J]. Journal of Structural and Construction Engineering, 2017, 143(7): 4017048.