锈蚀钢筋混凝土梁承载力与刚度研究
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摘要
混凝土结构耐久性问题是当今世界普遍关注的问题,钢筋的锈蚀是钢筋混凝土结构耐久性能降低的最主要的影响要素,因此锈蚀钢筋混凝土构件力学性能的研究显得尤为重要。本文结合国家自然科学基金项目(50478032)“既有钢筋混凝土桥梁时变可靠度研究”,进行了以下研究工作:
1)通过对48根快速锈蚀钢筋混凝土梁的试验数据的分析,得出了不同钢筋锈蚀率下梁的破坏模式和裂缝的发展规律,以及跨中位置混凝土截面应变分布特性。对锈蚀梁的承载力综合折减系数进行了分析,研究了钢筋直径、钢筋种类对锈蚀梁承载力的影响,并通过数据的拟合分析,得出了综合折减系数的表达式。
2)通过对应变数据的分析,论证了锈蚀构件钢筋和混凝土的应变不再符合平截面假定的结论,并通过回归分析得出了不同锈蚀率的钢筋混凝土梁在极限弯矩作用下,跨中截面处钢筋应变和钢筋处混凝土应变的关系。
3)通过对锈蚀钢筋混凝土梁的破坏模式的分析,可知锈蚀钢筋混凝土梁随锈蚀率的增加具有不同的破坏模式,同时钢筋与钢筋对应位置混凝土应变也不再相等,考虑了上述因素后对锈蚀钢筋混凝土梁进行了承载力的分析,并用试验数据对计算方法进行验证。
4)采用Msc.Marc软件对锈蚀梁进行了承载力的有限元分析。详细介绍了锈蚀钢筋混凝土梁的建模方法。探讨了锈蚀率对于梁的承载力、粘结应力,钢筋与对应位置混凝土的应变关系、裂缝特征等的影响。并基于有限元分析得出了协同工作系数的表达式。
5)通过对锈蚀钢筋混凝土梁刚度数据的分析,得出了以抗弯刚度规范公式为基础进行修正的锈蚀钢筋混凝土梁抗弯刚度计算方法。
Concrete durability is one of the world-wide concerned problems in the field of the structure engineering. Corrosion of reinforcement steel bar is already recognized as one of the most important factors effect the durability of reinforced concrete structures, it is particularly important to research the change laws of the mechanical properties of the corroded steel bar. Combining with the National Natural Science Foundation of China(No.50478032), following researches were done in this thesis:
1) By analysis of test data of 48 beams with accelerated corrosion,the damage mode and feature of crack with different corrosion-rate of beam were obtained and the distributing character of concrete strain in the section in midspan of beam . Analysis of combined reduction coefficient was done. By fitting data, the expression of combined reduct- -ion coefficient was obtained.
2) The conclusion has been obtained that the strain of corroded steel bar and concrete no longer fit in with the assumption of plane section through the analysis of the strain data, the strain relation of steel bar and concrete in the mid-span section of variously corroded beams at ultimate has been obtained.
3) Through the analysis of the damage mode of corrosion-beams.It is known that the corrosion-beams has different damage mode with different corrosion-rate. At the same time the strain between bar and concrete at the same place with bar is different, all this factors above were considered. The strength of corrosion-beams were analyzed and finally used test data to check the conclusion.
4) By the software of Msc.Marc,the strength of corrosion-beam was analyzed by finite element. The method of simulating corrosion-beam was clearly introduced. How corrosion-rate influenced strength, bond stress,strain between concrete and reinforcem- -ent, feature of crack were discussed .
5) Through the analysis of test data, the way to calculate the stiffness of corrosion-beam was presented by modifying the formula presented by code.
1)通过对48根快速锈蚀钢筋混凝土梁的试验数据的分析,得出了不同钢筋锈蚀率下梁的破坏模式和裂缝的发展规律,以及跨中位置混凝土截面应变分布特性。对锈蚀梁的承载力综合折减系数进行了分析,研究了钢筋直径、钢筋种类对锈蚀梁承载力的影响,并通过数据的拟合分析,得出了综合折减系数的表达式。
2)通过对应变数据的分析,论证了锈蚀构件钢筋和混凝土的应变不再符合平截面假定的结论,并通过回归分析得出了不同锈蚀率的钢筋混凝土梁在极限弯矩作用下,跨中截面处钢筋应变和钢筋处混凝土应变的关系。
3)通过对锈蚀钢筋混凝土梁的破坏模式的分析,可知锈蚀钢筋混凝土梁随锈蚀率的增加具有不同的破坏模式,同时钢筋与钢筋对应位置混凝土应变也不再相等,考虑了上述因素后对锈蚀钢筋混凝土梁进行了承载力的分析,并用试验数据对计算方法进行验证。
4)采用Msc.Marc软件对锈蚀梁进行了承载力的有限元分析。详细介绍了锈蚀钢筋混凝土梁的建模方法。探讨了锈蚀率对于梁的承载力、粘结应力,钢筋与对应位置混凝土的应变关系、裂缝特征等的影响。并基于有限元分析得出了协同工作系数的表达式。
5)通过对锈蚀钢筋混凝土梁刚度数据的分析,得出了以抗弯刚度规范公式为基础进行修正的锈蚀钢筋混凝土梁抗弯刚度计算方法。
Concrete durability is one of the world-wide concerned problems in the field of the structure engineering. Corrosion of reinforcement steel bar is already recognized as one of the most important factors effect the durability of reinforced concrete structures, it is particularly important to research the change laws of the mechanical properties of the corroded steel bar. Combining with the National Natural Science Foundation of China(No.50478032), following researches were done in this thesis:
1) By analysis of test data of 48 beams with accelerated corrosion,the damage mode and feature of crack with different corrosion-rate of beam were obtained and the distributing character of concrete strain in the section in midspan of beam . Analysis of combined reduction coefficient was done. By fitting data, the expression of combined reduct- -ion coefficient was obtained.
2) The conclusion has been obtained that the strain of corroded steel bar and concrete no longer fit in with the assumption of plane section through the analysis of the strain data, the strain relation of steel bar and concrete in the mid-span section of variously corroded beams at ultimate has been obtained.
3) Through the analysis of the damage mode of corrosion-beams.It is known that the corrosion-beams has different damage mode with different corrosion-rate. At the same time the strain between bar and concrete at the same place with bar is different, all this factors above were considered. The strength of corrosion-beams were analyzed and finally used test data to check the conclusion.
4) By the software of Msc.Marc,the strength of corrosion-beam was analyzed by finite element. The method of simulating corrosion-beam was clearly introduced. How corrosion-rate influenced strength, bond stress,strain between concrete and reinforcem- -ent, feature of crack were discussed .
5) Through the analysis of test data, the way to calculate the stiffness of corrosion-beam was presented by modifying the formula presented by code.
引文
[1] 罗福午主编.建筑结构缺陷事故的分析与防治[M].北京:清华大学出版社.1996,12.
[2] Kilareski W R. Failure of reinforcement concrete structures due to corrosion. Material Performance , 1980(3).
[3] 张誉等.混凝土结构耐久性概论.上海:上海科学技术出版社,2003,12:2-3.
[4] 惠云玲,林志伸,李荣.锈蚀钢筋性能试验研究分析.工业建筑,1997, 27(6): 10-13.
[5] 王雪慧,钟铁毅.混凝土中锈蚀钢筋截面损失率与重量损失率的关系.建材技术与应用,2005.1.
[6] 安琳,欧阳平,郑亚明,锈坑应力集中对钢筋力学性能的影响.东南大学学报,2005.
[7] 袁迎曙等.锈蚀钢筋的力学性能退化研究.工业建筑,2000,30(1):43-46.
[8] Aldridge WW, Jaffarzadeh M, Farhadi K. Effect of corrosion and bar spacing on bond properties of reinforcing bar in concrete. University of Oklahoma Research Institute,2000.
[9] 范颖芳,周晶.考虑蚀坑影响的锈蚀钢筋力学性能研究.建筑材料学报,2003,6(3): 248-252.
[10] 马良喆等.钢筋锈蚀后力学性能的试验研究.施工技术.2002,12(12).
[11] Lee H.S, Noguchi T, and Tomosawa F.FEM analysis for structural performance of deteriorated RC structures due to rebar corrosion. Proceedings of the Second International Conference on Concrete Under Severe Conditions, Troms, Norway, 1998:327-336.
[12] 张平生,卢梅.锈损钢筋的力学性能,工业建筑,1995(5).
[13] 张伟平.混凝土结构的钢筋锈蚀损伤预测及其耐久性评估.同济大学博士学位论文,1999.
[14] Ragnar Palsson and M. Saeed Mirza. Mechanical response of corroded steel reinforcement ofabandoned concrete bridge. ACI Structure Journal, 2002, 99(2): 157-162.
[15] Abdullah A. Almusallam. Effect of degree of corrosion on the properties of reinforcing steel bars.Construction and Building Materials, 2001, 15(8):361-368.
[16] 曹双寅 , 朱伯龙 . 受腐蚀混凝土和钢筋混凝土的性能 . 同济大学学报 ,1990, 18(2):239-242.
[17] 范颖芳,黄振国,郭乐工等. 硫酸盐腐蚀后混凝土力学性能研究.郑州工业大学学报,1999,20(1): 91-93.
[18] Roberto Capozucca,M. Nilde .CerriInfluence of reinforcement corrosion in the compressive zone on the behaviour of RC beams. Engineering Structures.2003:1575-1583.
[19] 张喜德.钢筋混凝土构件耐久性的若干问题研究.广西大学博士学位论文,2004.
[20] 吴瑾,吴胜兴.锈蚀钢筋混凝土受弯构件承载力评估.河海大学学报.2004,5(3)
[21] Vecchio and Collins. Vecchio, F., and Collins, M. P. ‘‘The modified compression field theory for reinforced concrete elements subjected to shear.’,1986:219-231.
[22] 赵羽习.钢筋混凝土结构粘结性能和耐久性的研究.浙江大学博士学位论文,2001.
[23] 潘振华,牛荻涛,王庆霖.锈蚀率与极限粘结强度关系的试验研究闭.工业建筑,2000 3(6): 10-12.
[24] Rodriguez, J., Ortega, L., and Garcia, A. ‘‘Corrosion of reinforcingbars and service life of R/C structures: Corrosion and bond deterioration.’’Proc., Int. Conf. on Concrete across Borders, 1994:315-326.
[25] Kapilesh Bhargava,corrosion-induced bond strength degradation in reinforced concrete-Analytical and empirical models.Nuclear Engineering and Design, 2007: 1140-1157.
[26] 袁迎曙,余索,贾福萍.锈蚀钢筋混凝土的粘结性能退化的试验研究.工业建筑,1999 29(11):47-50.
[27] Y Ballim, J. C. Reid and A. R. Kemp. Deflection of RC beams under simultaneous load and steel corrosion[J]. Magazine of Concrete Research, 2001, 53(3): 171-181.
[28] G J. Al-Sulaimani, M. Kaleemullah, I. A. Basunbul and Rasheeduzzafar. Influence of corrosion andcracking on bond behavior and strength of reinforced concrete members. ACI Structural Journa1.2000,87(2):220-231.
[29] Rodriguez J., Ortega L.M. and Casal J., Load carrying capacity of concrete structures withcorroded reinforcement, Construction and Building materials, 1997:239-248.
[30]惠云玲,李荣,林志伸等.混凝土基本构件钢筋锈蚀前后性能试验研究.工业建筑,1997 27(6):14-18.
[31]全明研.老化和损伤的钢筋混凝土构件的性能[J].工业建筑,1990,20(2):15-19.
[32] Abul K.Azad,Residual Strength of Corrosion-Damaged Reinforced Concrete Beams,ACI MATERIALS JOURNAL,January-February ,2007:40-47.
[33] Pritpal S.Mangat,Flexural Strength of Concrete Beams with Corroding Reinforcement. ACI STRUCTURAL Journal, 1999:149-158.
[34]牛荻涛,卢梅.锈蚀钢筋混凝土梁正截面受弯承载力计算方法研究,建筑结构,2002,10(10):14-17.
[35] 金伟良,赵羽习.锈蚀钢筋混凝土梁抗弯强度的试验研究.工业建筑,2001,31(5):9-11.
[36] 张国学,宋建夏,刘晓航.钢筋锈蚀对钢筋混凝土构件粘结力的影响[J].工业建筑.20(2):37-39.
[37] 袁迎曙.锈蚀钢筋混凝土梁的结构性能退化模型.土木工程学报.2001.6(3).
[38] 李自超.锈蚀钢筋混凝土构件性能退化与承载力研究.同济大学硕士论文,2006.
[39] Tachibana Yoshihiro, Maeda Ken-Ichi, Kajikawa Yasuo and Kawamura Mitsunori, Mechanical behaviour of RC beams damaged by corrosion of reinforcement, Third InternationalSymposium on “Corrosion of Reinforcement in Concrete Construction”, Wishaw, UK, 1990:178-187.
[40] 徐善华.混凝土结构退化模型与耐久性评估[D]:[博士学位论文].西安:西安建筑科技大学,2002.
[41] 王小惠,锈蚀钢筋混凝土梁承载能力,上海交通大学博士学位论文,2004.5.
[42] 范颖芳,受腐蚀钢筋混凝土构件性能研究,[博士学位论文],大连:大连理工大学,2002.
[43] 黄振国等,受腐蚀钢筋混凝土材料基本性能与受弯构件的试验研究.建筑结构,1998,28(12):18-20.
[44] Lee H.S., Tomosawa F. and Noguchi T., Effects of rebar corrosion on the structural performance of singly reinforcement beams, Durability of Building Materials and Components,1996:571-580.
[45] 陆新征 , 江见鲸 . 考虑不同破坏模式的二维混凝土本构模型 . 土木工程学报,2003,36(11):70-74.
[46] Buyukozturk O.Nonlinear analysis of reinforced concrete structures. Computers and Structures,1977,7(2):149-7156.
[47]江见鲸.混凝土力学(M).北京:中国铁道出版社,1984:30-47.
[48] Eligehausen R., Popov, E. P., and Bertero V. ‘‘Local bond stress-slip relationships of deformed bars under generalized excitations.’’,1983.
[49] 狄生林.钢筋混凝土梁的非线性有限元分析,南京工学院学报,1984,2:87-96.
[50] 孙彬 , 牛荻涛 , 王庆霖 , 锈蚀钢筋混凝土梁抗弯刚度分析与计算 , 建筑结构,2004,34(10):43-47.
[2] Kilareski W R. Failure of reinforcement concrete structures due to corrosion. Material Performance , 1980(3).
[3] 张誉等.混凝土结构耐久性概论.上海:上海科学技术出版社,2003,12:2-3.
[4] 惠云玲,林志伸,李荣.锈蚀钢筋性能试验研究分析.工业建筑,1997, 27(6): 10-13.
[5] 王雪慧,钟铁毅.混凝土中锈蚀钢筋截面损失率与重量损失率的关系.建材技术与应用,2005.1.
[6] 安琳,欧阳平,郑亚明,锈坑应力集中对钢筋力学性能的影响.东南大学学报,2005.
[7] 袁迎曙等.锈蚀钢筋的力学性能退化研究.工业建筑,2000,30(1):43-46.
[8] Aldridge WW, Jaffarzadeh M, Farhadi K. Effect of corrosion and bar spacing on bond properties of reinforcing bar in concrete. University of Oklahoma Research Institute,2000.
[9] 范颖芳,周晶.考虑蚀坑影响的锈蚀钢筋力学性能研究.建筑材料学报,2003,6(3): 248-252.
[10] 马良喆等.钢筋锈蚀后力学性能的试验研究.施工技术.2002,12(12).
[11] Lee H.S, Noguchi T, and Tomosawa F.FEM analysis for structural performance of deteriorated RC structures due to rebar corrosion. Proceedings of the Second International Conference on Concrete Under Severe Conditions, Troms, Norway, 1998:327-336.
[12] 张平生,卢梅.锈损钢筋的力学性能,工业建筑,1995(5).
[13] 张伟平.混凝土结构的钢筋锈蚀损伤预测及其耐久性评估.同济大学博士学位论文,1999.
[14] Ragnar Palsson and M. Saeed Mirza. Mechanical response of corroded steel reinforcement ofabandoned concrete bridge. ACI Structure Journal, 2002, 99(2): 157-162.
[15] Abdullah A. Almusallam. Effect of degree of corrosion on the properties of reinforcing steel bars.Construction and Building Materials, 2001, 15(8):361-368.
[16] 曹双寅 , 朱伯龙 . 受腐蚀混凝土和钢筋混凝土的性能 . 同济大学学报 ,1990, 18(2):239-242.
[17] 范颖芳,黄振国,郭乐工等. 硫酸盐腐蚀后混凝土力学性能研究.郑州工业大学学报,1999,20(1): 91-93.
[18] Roberto Capozucca,M. Nilde .CerriInfluence of reinforcement corrosion in the compressive zone on the behaviour of RC beams. Engineering Structures.2003:1575-1583.
[19] 张喜德.钢筋混凝土构件耐久性的若干问题研究.广西大学博士学位论文,2004.
[20] 吴瑾,吴胜兴.锈蚀钢筋混凝土受弯构件承载力评估.河海大学学报.2004,5(3)
[21] Vecchio and Collins. Vecchio, F., and Collins, M. P. ‘‘The modified compression field theory for reinforced concrete elements subjected to shear.’,1986:219-231.
[22] 赵羽习.钢筋混凝土结构粘结性能和耐久性的研究.浙江大学博士学位论文,2001.
[23] 潘振华,牛荻涛,王庆霖.锈蚀率与极限粘结强度关系的试验研究闭.工业建筑,2000 3(6): 10-12.
[24] Rodriguez, J., Ortega, L., and Garcia, A. ‘‘Corrosion of reinforcingbars and service life of R/C structures: Corrosion and bond deterioration.’’Proc., Int. Conf. on Concrete across Borders, 1994:315-326.
[25] Kapilesh Bhargava,corrosion-induced bond strength degradation in reinforced concrete-Analytical and empirical models.Nuclear Engineering and Design, 2007: 1140-1157.
[26] 袁迎曙,余索,贾福萍.锈蚀钢筋混凝土的粘结性能退化的试验研究.工业建筑,1999 29(11):47-50.
[27] Y Ballim, J. C. Reid and A. R. Kemp. Deflection of RC beams under simultaneous load and steel corrosion[J]. Magazine of Concrete Research, 2001, 53(3): 171-181.
[28] G J. Al-Sulaimani, M. Kaleemullah, I. A. Basunbul and Rasheeduzzafar. Influence of corrosion andcracking on bond behavior and strength of reinforced concrete members. ACI Structural Journa1.2000,87(2):220-231.
[29] Rodriguez J., Ortega L.M. and Casal J., Load carrying capacity of concrete structures withcorroded reinforcement, Construction and Building materials, 1997:239-248.
[30]惠云玲,李荣,林志伸等.混凝土基本构件钢筋锈蚀前后性能试验研究.工业建筑,1997 27(6):14-18.
[31]全明研.老化和损伤的钢筋混凝土构件的性能[J].工业建筑,1990,20(2):15-19.
[32] Abul K.Azad,Residual Strength of Corrosion-Damaged Reinforced Concrete Beams,ACI MATERIALS JOURNAL,January-February ,2007:40-47.
[33] Pritpal S.Mangat,Flexural Strength of Concrete Beams with Corroding Reinforcement. ACI STRUCTURAL Journal, 1999:149-158.
[34]牛荻涛,卢梅.锈蚀钢筋混凝土梁正截面受弯承载力计算方法研究,建筑结构,2002,10(10):14-17.
[35] 金伟良,赵羽习.锈蚀钢筋混凝土梁抗弯强度的试验研究.工业建筑,2001,31(5):9-11.
[36] 张国学,宋建夏,刘晓航.钢筋锈蚀对钢筋混凝土构件粘结力的影响[J].工业建筑.20(2):37-39.
[37] 袁迎曙.锈蚀钢筋混凝土梁的结构性能退化模型.土木工程学报.2001.6(3).
[38] 李自超.锈蚀钢筋混凝土构件性能退化与承载力研究.同济大学硕士论文,2006.
[39] Tachibana Yoshihiro, Maeda Ken-Ichi, Kajikawa Yasuo and Kawamura Mitsunori, Mechanical behaviour of RC beams damaged by corrosion of reinforcement, Third InternationalSymposium on “Corrosion of Reinforcement in Concrete Construction”, Wishaw, UK, 1990:178-187.
[40] 徐善华.混凝土结构退化模型与耐久性评估[D]:[博士学位论文].西安:西安建筑科技大学,2002.
[41] 王小惠,锈蚀钢筋混凝土梁承载能力,上海交通大学博士学位论文,2004.5.
[42] 范颖芳,受腐蚀钢筋混凝土构件性能研究,[博士学位论文],大连:大连理工大学,2002.
[43] 黄振国等,受腐蚀钢筋混凝土材料基本性能与受弯构件的试验研究.建筑结构,1998,28(12):18-20.
[44] Lee H.S., Tomosawa F. and Noguchi T., Effects of rebar corrosion on the structural performance of singly reinforcement beams, Durability of Building Materials and Components,1996:571-580.
[45] 陆新征 , 江见鲸 . 考虑不同破坏模式的二维混凝土本构模型 . 土木工程学报,2003,36(11):70-74.
[46] Buyukozturk O.Nonlinear analysis of reinforced concrete structures. Computers and Structures,1977,7(2):149-7156.
[47]江见鲸.混凝土力学(M).北京:中国铁道出版社,1984:30-47.
[48] Eligehausen R., Popov, E. P., and Bertero V. ‘‘Local bond stress-slip relationships of deformed bars under generalized excitations.’’,1983.
[49] 狄生林.钢筋混凝土梁的非线性有限元分析,南京工学院学报,1984,2:87-96.
[50] 孙彬 , 牛荻涛 , 王庆霖 , 锈蚀钢筋混凝土梁抗弯刚度分析与计算 , 建筑结构,2004,34(10):43-47.