锈蚀钢筋混凝土梁受弯性能试验研究
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摘要
本文针对锈蚀钢筋混凝土梁的受弯性能展开试验研究。采用人工加速锈蚀的方法,制作不同锈蚀率的钢筋混凝土梁,采用四点受弯的加载形式进行静力加载至破坏,破坏后取出钢筋测量锈蚀率及抗拉强度。分析试验结果可以得出以下结论:在利用实测数据进行锈蚀钢筋强度统计回归中可采用按未锈蚀钢筋截面面积计算锈蚀钢筋强度的方法,以便在锈蚀钢筋混凝土结构安全评估的时候可以直接采用按上述回归公式计算出的锈蚀钢筋强度作为结构内钢筋强度,从而避免了对钢筋截面面积和钢筋强度同时修正的困难。对应锈蚀钢筋强度(按未锈蚀钢筋截面面积计算)下降程度可以发现,当锈蚀率较小(<10%)时,钢筋混凝土梁的承载力退化主要是因为钢筋强度的下降;当锈蚀率较大(>10%)时,钢筋混凝土梁的承载力退化不单是因为钢筋强度的下降,由锈蚀引起的钢筋与混凝土间的粘结退化也起到了关键作用。
The experimental study on the bending performance of corroded reinforced concrete beam was carried out in this paper. The reinforced concrete beams with different corrosion ratios were fabricated by artificial accelerated method and four-point bending test was applied on these corroded beams. After test, the corroded steel bars were obtained and their corrosion ratio and tension strength were measured. From the results some conclusions can be given. The tension strength of corroded bars can be calculated by measured yielding force of corroded steel bars and section area of non-corroded steel bars. The tension strength can be used to calculate the load carrying capacity of existing concrete structure, which avoids the problem of modifying the section area and tension strength of corroded steel bars at the same time. Besides, the decrease of tension strength of corroded bars is the main reason for the deterioration of concrete beams when the corrosion ratio is less than 10%. However, when the corrosion ratio is more than 10%, the bonding performance between concrete and steel play a key role for the deterioration of load carrying capacity.
The experimental study on the bending performance of corroded reinforced concrete beam was carried out in this paper. The reinforced concrete beams with different corrosion ratios were fabricated by artificial accelerated method and four-point bending test was applied on these corroded beams. After test, the corroded steel bars were obtained and their corrosion ratio and tension strength were measured. From the results some conclusions can be given. The tension strength of corroded bars can be calculated by measured yielding force of corroded steel bars and section area of non-corroded steel bars. The tension strength can be used to calculate the load carrying capacity of existing concrete structure, which avoids the problem of modifying the section area and tension strength of corroded steel bars at the same time. Besides, the decrease of tension strength of corroded bars is the main reason for the deterioration of concrete beams when the corrosion ratio is less than 10%. However, when the corrosion ratio is more than 10%, the bonding performance between concrete and steel play a key role for the deterioration of load carrying capacity.
引文
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[12] Zhu Jinsong, Gao Change. Probabilistic durability assessment approach of deteriorating RC bridges[J]. Journal of Southeast University, 2011, 27(1): 70-76.
[13] 孙彬, 牛荻涛, 王庆霖. 基于区间分析的锈蚀钢筋混凝土结构使用寿命预测[J]. 建筑结构学报, 2012, 33(6): 110-115.SUN Bin, NIU Ditao, WANG Qinglin. Service life prediction of corroded RC structures based on interval analysis[J]. Journal of Building Structures, 2012, 33(6): 110-115. (in Chinese)
[14] Nestor F. Ortega, Sandra I. Robles. Assessment of Residual Life of concrete structures affected by reinforcement corrosion[J]. HBRC Journal, 2016, 12(2): 114-122.
[15] 金伟良, 钟小平. 结构全寿命的耐久性与安全性、 适用性的关系[J]. 建筑结构学报, 2009, 30(6): 1-7.JIN Weiliang, ZHONG Xiaoping. Relationship of structural durability with structural safety and serviceability in whole life-cycle[J]. Journal of Building Structures, 2009, 30(6): 1-7. (in Chinese)
[16] 惠云玲, 林志伸, 李荣. 锈蚀钢筋性能试验研究分析[J]. 工业建筑, 1997, 27(6): 40-44.HUI Yunling, LIN Zhishen, LI Rong. Experimental study and analysis on the property of corroded rebar[J]. Industrial Construction, 1997, 27(6): 40-44. (in Chinese)
[17] 吕毅刚, 张建仁, 彭晖, 等. 既有钢筋混凝土Π梁正截面抗弯承载力研究[J]. 中南大学学报: 自然科学版, 2011, 42(2): 456-462.LV Yigang, ZHANG Jianren, PENG Hui, et al. Flexural bearing capacity of existing reinforced concrete Π beams[J]. Journal of Central South University: Science and Technology, 2011, 42(2): 456-462. (in Chinese)
[2] 金伟良, 夏晋, 蒋遨宇, 等. 锈蚀钢筋混凝土梁受弯承载力计算模型[J]. 土木工程学报, 2009, 42(11): 64-70.JIN Weiliang, XIA Pu, JIANG Aoyu, et al. Flexural capacity of corrosion-damaged RC beams[J]. China Civil Engineering Journal, 2009, 42(11): 64-70. (in Chinese)
[3] AC Juarez, Guevara B, Fajardo G, et al. Ultimate and nominal shear strength in reinforced concrete beams deteriorated by corrosion[J]. Engineering Structures, 2011, 33(12): 3189-3196.
[4] Tapan M, Aboutaha RS. Effect of steel corrosion and loss of concrete cover on strength of deteriorated RC columns[J]. Construction and Building Materials, 2011, 25(5): 2596-2603.
[5] 吴庆, 袁迎曙, 朱金, 等. 锈蚀钢筋混凝土压弯构件性能退化试验研究[J]. 中国矿业大学学报, 2010, 39(6): 843-848.WU Qing, YUAN Yingshu, ZHU Jin, et al. Experimental study of the mechanical behavior of corroded reinforced concrete members[J]. Journal of China University of Mining & Technology, 2010, 39(6): 843-848. (in Chinese)
[6] 王雪松, 金贤玉, 金南国, 等. 荷载作用下开裂钢筋混凝土梁锈胀开裂模式及锈蚀分布研究[J]. 建筑结构学报, 2013, 34(11): 151-157.WANG Xuesong, JIN Xianyu, JIN Nanguo, et al. Crack shape and rust distribution in corrosion-induced cracking concrete coupled with load[J]. Journal of Building Structures, 2013, 34(11): 151-157. (in Chinese)
[7] 卫军, 张萌, 董荣珍, 李沛, 等. 钢筋锈蚀对混凝土梁破坏模式影响的试验研究[J]. 湖南大学学报: 自然科学版, 2013, 40(10): 15-21.WEI Jun, ZHANG Meng, DONG Rongzhen, et al. Experimental research on the failure mode of concrete beam due to steel corrosion[J]. Journal of Hunan University: Natural Sciences, 2013, 40(10): 15-21. (in Chinese)
[8] Sanz B, Planas J, Sancho JM. An experimental and numerical study of the pattern of cracking of concrete due to steel reinforcement corrosion[J]. Engineering Fracture Mechanics, 2013, 114(12): 26-41.
[9] Inamullah Khan, Raoul Fran?倞ois, Arnaud Castel. Prediction of reinforcement corrosion using corrosion induced cracks width in corroded reinforced concrete beams[J]. Cement and Concrete Research, 2014, 56(2): 84-96.
[10] ?owińska-Kluge A, Baszczyński T. The influence of internal corrosion on the durability of concrete[J]. Archives of Civil and Mechanical Engineering, 2012, 12(2): 219-227.
[11] M. Shafqat Ali, Chenhui Ji, M. Saeed Mirza. Durable design of reinforced concrete elements against corrosion[J]. Construction and Building Materials, 2015, 93(9): 317-325.
[12] Zhu Jinsong, Gao Change. Probabilistic durability assessment approach of deteriorating RC bridges[J]. Journal of Southeast University, 2011, 27(1): 70-76.
[13] 孙彬, 牛荻涛, 王庆霖. 基于区间分析的锈蚀钢筋混凝土结构使用寿命预测[J]. 建筑结构学报, 2012, 33(6): 110-115.SUN Bin, NIU Ditao, WANG Qinglin. Service life prediction of corroded RC structures based on interval analysis[J]. Journal of Building Structures, 2012, 33(6): 110-115. (in Chinese)
[14] Nestor F. Ortega, Sandra I. Robles. Assessment of Residual Life of concrete structures affected by reinforcement corrosion[J]. HBRC Journal, 2016, 12(2): 114-122.
[15] 金伟良, 钟小平. 结构全寿命的耐久性与安全性、 适用性的关系[J]. 建筑结构学报, 2009, 30(6): 1-7.JIN Weiliang, ZHONG Xiaoping. Relationship of structural durability with structural safety and serviceability in whole life-cycle[J]. Journal of Building Structures, 2009, 30(6): 1-7. (in Chinese)
[16] 惠云玲, 林志伸, 李荣. 锈蚀钢筋性能试验研究分析[J]. 工业建筑, 1997, 27(6): 40-44.HUI Yunling, LIN Zhishen, LI Rong. Experimental study and analysis on the property of corroded rebar[J]. Industrial Construction, 1997, 27(6): 40-44. (in Chinese)
[17] 吕毅刚, 张建仁, 彭晖, 等. 既有钢筋混凝土Π梁正截面抗弯承载力研究[J]. 中南大学学报: 自然科学版, 2011, 42(2): 456-462.LV Yigang, ZHANG Jianren, PENG Hui, et al. Flexural bearing capacity of existing reinforced concrete Π beams[J]. Journal of Central South University: Science and Technology, 2011, 42(2): 456-462. (in Chinese)