锈蚀钢筋混凝土受压构件受力性能研究
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摘要
近年来的工程调查表明,已有建筑因为耐久性问题而发生破坏的情况越来越多,其中因钢筋锈蚀需要处理的工程具有普遍性,造成的损失也是难以估量的;钢筋锈蚀是影响混凝土结构耐久性的重要因素之一,而锈蚀钢筋的截面损失及其力学性能的降低、钢筋和混凝土之间粘结性能的退化、以及钢筋锈胀力导致的混凝土锈胀开裂是导致钢筋混凝土结构锈蚀后耐久性降低的三个主要因素。可见钢筋锈蚀问题不仅仅是一个经济问题,更是一个关系到结构安全的问题,所以对锈蚀钢筋混凝土构件受力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”,主要进行了以下研究工作:
1)通过对39根快速锈蚀钢筋混凝土矩形截面柱(轴心受压、大偏心受压、小偏心受压构件各13根)数据的定性分析,得到了不同锈蚀率下,锈蚀钢筋混凝土矩形截面柱极限抗压承载力的变化规律;
2)试验发现钢筋锈蚀可能改变构件的破坏形态,进而提出锈蚀钢筋混凝土受压构件大小偏心受压的界限——相对界限受压区高度的计算公式,并建立有限元模型对公式加以验证;
3)在建立锈蚀小偏心受压构件承载力计算公式时,论证了锈蚀构件钢筋和混凝土的应变不再协调的结论,并通过回归分析得出了不同锈蚀率不同钢筋类型柱在极限压力作用下,柱中点截面处钢筋应变和钢筋处混凝土应变的关系,通过构造新的几何关系,得出了以锈蚀率为主要变量的锈蚀钢筋混凝土小偏心受压柱的极限抗压承载力计算建议公式,并通过试验数据加以验证;
4)钢筋锈蚀引起粘结锚固性能下降进而引起钢筋和混凝土之间协同工作能力的下降,通过引入协同工作系数,建立锈蚀钢筋混凝土大偏心受压柱的极限抗压承载力计算公式,并通过试验数据加以验证。
Recent engineering investigations show that there are more and more destruction cases induced by the descent in durability of reinforced concrete structures. And reinforcement rustiness is very common in these cases. The damage caused is huge; A great many research revealed that reinforcement corrosion is one of the most important factors influencing structural durability. The reduction of effective diameter of reinforcement bars, the loss of bond between steel and concrete and the microcrack of concrete due to the expansion of the bars by the rust products are the principal aspects of the corrosion damage. This shows that reinforcement corrosion problem is not just an economic issue, it is also a relationship to the structural safety problems. Therefore the research on corroded reinforced concrete structures on the mechanical properties is particularly important.
Combining with the National Natural Science Foundation of China(No.50478032), following researches were done in this thesis:
1) The variation regularity of the ultimate anti-bending capacity of the rectangular-sectioned beam with different corrosion has been obtained through the qualitative analysis of 39 columns (Axial compression columns, reinforced concrete columns with large-eccentric compression and reinforced concrete columns with small-eccentric compression each 13) with accelerated corrosion;
2) Test found that steel corrosion may change the member’s damage shape. Then proposed a formula for calculating the limits of great or small eccentric compression----the height of boundary compression area, and combine with the test established finite element method to verify it;
3) 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. Through the building of new geometric relation, the formula with corrosion rate as the main variable for the anti-compressing capacity of the small eccentric compression corroded reinforced concrete columns has been suggested and verified by experiment;
4) Steel corrosion decline the bond performance, further decline the ability to work synergies between the steel and the concrete. Through introduction of coordination coefficient to establish a ultimate compressing capacity model of the great eccentric compression corroded reinforced concrete column, and through test data to verify.
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”,主要进行了以下研究工作:
1)通过对39根快速锈蚀钢筋混凝土矩形截面柱(轴心受压、大偏心受压、小偏心受压构件各13根)数据的定性分析,得到了不同锈蚀率下,锈蚀钢筋混凝土矩形截面柱极限抗压承载力的变化规律;
2)试验发现钢筋锈蚀可能改变构件的破坏形态,进而提出锈蚀钢筋混凝土受压构件大小偏心受压的界限——相对界限受压区高度的计算公式,并建立有限元模型对公式加以验证;
3)在建立锈蚀小偏心受压构件承载力计算公式时,论证了锈蚀构件钢筋和混凝土的应变不再协调的结论,并通过回归分析得出了不同锈蚀率不同钢筋类型柱在极限压力作用下,柱中点截面处钢筋应变和钢筋处混凝土应变的关系,通过构造新的几何关系,得出了以锈蚀率为主要变量的锈蚀钢筋混凝土小偏心受压柱的极限抗压承载力计算建议公式,并通过试验数据加以验证;
4)钢筋锈蚀引起粘结锚固性能下降进而引起钢筋和混凝土之间协同工作能力的下降,通过引入协同工作系数,建立锈蚀钢筋混凝土大偏心受压柱的极限抗压承载力计算公式,并通过试验数据加以验证。
Recent engineering investigations show that there are more and more destruction cases induced by the descent in durability of reinforced concrete structures. And reinforcement rustiness is very common in these cases. The damage caused is huge; A great many research revealed that reinforcement corrosion is one of the most important factors influencing structural durability. The reduction of effective diameter of reinforcement bars, the loss of bond between steel and concrete and the microcrack of concrete due to the expansion of the bars by the rust products are the principal aspects of the corrosion damage. This shows that reinforcement corrosion problem is not just an economic issue, it is also a relationship to the structural safety problems. Therefore the research on corroded reinforced concrete structures on the mechanical properties is particularly important.
Combining with the National Natural Science Foundation of China(No.50478032), following researches were done in this thesis:
1) The variation regularity of the ultimate anti-bending capacity of the rectangular-sectioned beam with different corrosion has been obtained through the qualitative analysis of 39 columns (Axial compression columns, reinforced concrete columns with large-eccentric compression and reinforced concrete columns with small-eccentric compression each 13) with accelerated corrosion;
2) Test found that steel corrosion may change the member’s damage shape. Then proposed a formula for calculating the limits of great or small eccentric compression----the height of boundary compression area, and combine with the test established finite element method to verify it;
3) 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. Through the building of new geometric relation, the formula with corrosion rate as the main variable for the anti-compressing capacity of the small eccentric compression corroded reinforced concrete columns has been suggested and verified by experiment;
4) Steel corrosion decline the bond performance, further decline the ability to work synergies between the steel and the concrete. Through introduction of coordination coefficient to establish a ultimate compressing capacity model of the great eccentric compression corroded reinforced concrete column, and through test data to verify.
引文
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[3] 洪定海. 混凝土中钢筋的腐蚀与防护. 北京: 中国铁道出版社, 1998
[4] 朱伯龙, 肖建庄. 碳化混凝土的结构性能. 工业建筑, 1998 28(9): 41-44
[5] 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
[6] 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
[7] 吴胜兴. 钢筋混凝土结构锈裂损伤研究综述. 工程力学(增刊), 2002: 70-88
[8] 丁威, 崔国惠. 大气条件下混凝土中钢筋锈蚀程度发展对保护层开裂和钢筋力学性能影响的试验研究[J]. 混凝土, 2000, (1): 38-41
[9] 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): 10-13
[10] 袁迎曙, 贾福萍, 蔡跃. 锈蚀钢筋的力学性能退化研究[J]. 工业建筑, 2000, 30 (1): 43-46
[11] 张平生, 卢梅, 李小燕. 锈损钢筋的力学性能[J]. 工业建筑, 1995, 25 (9): 41-44
[12] 黄振国, 范颖芳等. 受腐蚀钢筋混凝土材料基本性能与受弯构件的试验研究[J].建筑结构, 1998, (12): 18-21
[13] 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
[14] Uomoto T, Misra S. Behavior of concrete beams and columns in marine environment when corrosionof reinforcing bars takes place. Detriot: ACI Spec. Publ. American Concrete Institute, 1984: 127-146
[15] Maslehuddin M, Ibrahim IM, Al-Sulaimani GJ, Al-Mana Al, Abduljauwad SN. Effect of rusting ofreinforcing steel on its mechanical properties and bond with concrete. ACI Materials Journal,1990,87(5): 496-502
[16] 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
[17] Ragnar Palsson and M. Saeed Mirza. Mechanical response of corroded steel reinforcement ofabandoned concrete bridge. ACI Structure Journal, 2002, 99(2): 157-162
[18] Abdullah A. Almusallam. Effect of degree of corrosion on the properties of reinforcing steel bars.Construction and Building Materials, 2001, 15(8): 361-368
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