پیوندهای مفید
آمار
| تعداد نشریات | 9 |
| تعداد شمارهها | 448 |
| تعداد مقالات | 5,741 |
| تعداد مشاهده مقاله | 8,108,550 |
| تعداد دریافت فایل اصل مقاله | 6,592,860 |
تحلیل هزینهی چرخهی عمر ترک ناشی از خوردگی یکنواخت کلریدی در تیر بتن آرمه | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 15، دوره 53، شماره 4، تیر 1400، صفحه 1491-1506 اصل مقاله (2.71 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2020.17001.6421 | ||
| نویسندگان | ||
| معصومه تقی پور؛ مهدی دهستانی* | ||
| دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران. | ||
| چکیده | ||
| خوردگی آرماتور، فرآیندی پیچیده و از مهمترین عوامل شکست سازههای بتن مسلح است که باعث کاهش مقاومت و خدمتپذیری سازه میگردد که جلوگیری از این اثرات منفی، مستلزم صرف هزینههای گزافی است. به همین دلیل نیاز است که این فرآیند با استفاده از تحلیلهای احتمالاتی و آنالیز قابلیت اعتماد با در نظر گرفتن عدم قطعیتها در فاز خوردگی، مدلسازی شود. همچنین با در نظر گرفتن روشهای مختلف نگهداری و آنالیز چرخه عمر، میتوان هزینه تعمیر و نگهداری ناشی از خوردگی را به حداقل رساند. از اثرات خوردگی بر عملکرد سازه، ترک ناشی از گسترش محصولات خوردگی است. عرض ترک یک پارامتر مهم برای طراحی و ارزیابی عملکرد سازههای بتنی است. بنابراین در این مقاله ابتدا مدلی تحلیلی برای محاسبه عرض ترک ناشی از خوردگی ارائه گردید. پیشبینی ترک در مراحل مختلف در طول انتشار ترک از سطح میلگرد تا سطح پوشش بتن مورد بررسی قرار میگیرد. از جمله ویژگی بارز این مدل این است که به طور مستقیم به فاکتورهای بحرانی موثر بر عرض ترک مربوط میشود. در ادامه ضمن در نظر گرفتن عرض ترک به عنوان متغیر تصادفی در محاسبه احتمال ترک خوردگی سازههای بتنی که بر اساس فرآیند تصادفی گاما صورت میپذیرد، به بررسی هزینههای چرخه عمر و تعیین بازه بهینه تعمیر از طریق فرآیند تجدید، پرداخته میشود. همچنین اثر پارامترهای سازهای شامل قطر میلگرد و نرخ خوردگی، بر احتمال گسیختگی سازه و هزینههای ناشی از خرابی در چرخه عمر بررسی میشود. نتایج حاکی از آن است که از بین این پارامترها، نرخ خوردگی بیشترین تاثیر را بر عرض ترک و هزینه چرخه عمر دارد. | ||
| کلیدواژهها | ||
| خوردگی میلگرد؛ قابلیت اعتماد؛ چرخه عمر؛ احتمال گسیختگی؛ نرخ خوردگی | ||
| موضوعات | ||
| تکنولوژی بتن؛ سازه بتنی؛ مقاوم سازی سازه های بتنی | ||
| عنوان مقاله [English] | ||
| Life-cycle cost analysis of cracking in a reinforced concrete beam under uniform chloride corrosion | ||
| نویسندگان [English] | ||
| Masoumeh Taghipour؛ Mehdi Dehestani | ||
| Faculty of Civil Engineering, Babol Noshirvani University of Technology | ||
| چکیده [English] | ||
| Corrosion of rebar is one of the major problems in reinforced concrete structures under a corrosive environment which causes serious damage to the structures. Corrosion of rebar is a complex process and one of the important factors of failure of reinforced concrete structures which reduces the strength and serviceability of the structures thus avoiding these adverse effects requiring a high cost. For this reason, this process needs to be modeled using probabilistic analysis and reliability analysis with uncertainties in the corrosion phase. Considering the different maintenance strategies and life cycle analysis methods, the cost of maintenance and repair can be delayed. One of the corrosion effects on structure performance is crack on the concrete surface due to the expansion of the corrosion product. The crack width is an important parameter for designing and evaluating the performance of concrete structures. Therefore, this paper presents an analytical model to calculate the crack width due to corrosion. Crack evolution in the concrete cover due to expansive corrosion products is investigated at different stages during crack propagation across the cover, from the reinforcing bar-concrete interface to the concrete. A merit of this model is that it is directly related to the factors that affect the corrosion-induced cracking process. Then, the predicted crack width is chosen as a stochastic variable and the probability of failure in concrete structures is calculated by using a stochastic deterioration model and the gamma process. The calculated probability is then used to calculate the life cycle cost and determine the optimal repair time by using the renewal process. The effect of structural parameters on the probability of failure is also investigated. The results show that the corrosion rate is one of the most important factors affecting the crack width, the probability of failure, and life cycle cost. | ||
| کلیدواژهها [English] | ||
| Corrosion of Reinforcement, Reliability, Life Cycle, Probability of Failure, Corrosion Rate | ||
| مراجع | ||
|
[1] J.P. Broomfield, Corrosion of steel in concrete: understanding, investigation and repair, CRC Press, 2003. [2] R. Weyers, Modelling the time-to-cracking in chloride contaminated reinforced concrete structure, ACI Materials Journal, 95(6) (1998). [3] Z. Chen, Effect of reinforcement corrosion on the serviceability of reinforced concrete structures, Master's thesis, Department of Civil Engineering, University of Dundee, UK, (2004). [4] E. pishnamazi, Corrosion economy in Iran considering challenges, statistics and evaluations, In Persian, in: The Sixtht National conference of Corrosion, Tehran, 1382. [5] H.-P. Chen, Residual Flexural Capacity and Performance Assessment of Corroded Reinforced Concrete Beams, Journal of Structural Engineering, 144(12) (2018) 04018213. [6] S.J. Pantazopoulou, K. Papoulia, Modeling cover-cracking due to reinforcement corrosion in RC structures, Journal of engineering mechanics, 127(4) (2001) 342-351. [7] J. Zhong, P. Gardoni, D. Rosowsky, Stiffness degradation and time to cracking of cover concrete in reinforced concrete structures subject to corrosion, Journal of engineering mechanics, 136(2) (2009) 209-219. [8] B.S. Jang, B.H. Oh, Effects of non-uniform corrosion on the cracking and service life of reinforced concrete structures, Cement and Concrete Research, 40(9) (2010) 1441-1450. [9] A. Torres-Acosta, Accelerated vs. natural corrosion experimental results for remaining life stage forecasting, in: 6th Int. Conf. on Concrete Under Severe Conditions (CONSEC'10), eds. P. Castro-Borges, EI Moreno, K. Sakai, OE Gjorv, N. Banthia (London, UK: CRC Press, Taylor & Francis Group, 2010), 2010, pp. 35. [10] I. Khan, R. François, A. Castel, Prediction of reinforcement corrosion using corrosion induced cracks width in corroded reinforced concrete beams, Cement and concrete research, 56 (2014) 84-96. [11] R. Zhang, A. Castel, R. François, Concrete cover cracking with reinforcement corrosion of RC beam during chloride-induced corrosion process, Cement and Concrete Research, 40(3) (2010) 415-425. [12] P.G. Gambarova, G. Rosati, C. Schumm, Bond and splitting: a vexing question, Special Publication, 180 (1998) 23-44. [13] M.G. Stewart, Q. Suo, Extent of spatially variable corrosion damage as an indicator of strength and time-dependent reliability of RC beams, Engineering Structures, 31(1) (2009) 198-207. [14] Y. Zhao, J. Yu, W. Jin, Damage analysis and cracking model of reinforced concrete structures with rebar corrosion, Corrosion Science, 53(10) (2011) 3388-3397. [15] M.G. Stewart, A. Al-Harthy, Pitting corrosion and structural reliability of corroding RC structures: Experimental data and probabilistic analysis, Reliability engineering & system safety, 93(3) (2008) 373-382. [16] D.-E. Choe, P. Gardoni, D. Rosowsky, Fragility increment functions for deteriorating reinforced concrete bridge columns, Journal of engineering mechanics, 136(8) (2010) 969-978. [17] H. Narasimhan, M. Chew, Integration of durability with structural design: An optimal life cycle cost based design procedure for reinforced concrete structures, Construction and Building Materials, 23(2) (2009) 918-929. [18] A. Firouzi, A. Rahai, An integrated ANN-GA for reliability based inspection of concrete bridge decks considering extent of corrosion-induced cracks and life cycle costs, Scientia Iranica, 19(4) (2012) 974-981. [19] J.M. van Noortwijk, D.M. Frangopol, Two probabilistic life-cycle maintenance models for deteriorating civil infrastructures, Probabilistic Engineering Mechanics, 19(4) (2004) 345-359. [20] H.-P. Chen, A.M. Alani, Optimized maintenance strategy for concrete structures affected by cracking due to reinforcement corrosion, ACI Structural Journal, 110(2) (2013) 229. [21] Z.P. Bazant, Fracture and size effect in concrete and other quasibrittle materials, Routledge, 2019. [22] H.-P. Chen, N. Xiao, Symptom-based reliability analyses and performance assessment of corroded reinforced concrete structures, Struct. Mech. Eng, 53(6) (2015) 1183-1200. [23] C. MC90, Design of concrete structures. CEB-FIP Model Code 1990, in, Thomas Telford, 1993. [24] R. Zhang, A. Castel, R. François, Serviceability limit state criteria based on steel–concrete bond loss for corroded reinforced concrete in chloride environment, Materials and structures, 42(10) (2009) 1407. [25] P.C. Das, Reliability based bridge management procedures, in: BRIDGE MANAGEMENT 4-INSPECTION, MAINTENANCE, ASSESSMENT AND REPAIR, 2000. [26] H.-P. Chen, J. Nepal, Stochastic modelling and lifecycle performance assessment of bond strength of corroded reinforcement in concrete, Structural Engineering and Mechanics, 54(2) (2015) 319-336. [27] J.M. van Noortwijk, A survey of the application of gamma processes in maintenance, Reliability Engineering & System Safety, 94(1) (2009) 2-21. [28] A.H.-S. Ang, W.H. Tang, Probability concepts in engineering planning and design, vol. 2: Decision, risk, and reliability, JOHN WILEY & SONS, INC., 605 THIRD AVE., NEW YORK, NY 10158, USA, 1984, 608, (1984). [29] J.A. Mullard, M.G. Stewart, Life-cycle cost assessment of maintenance strategies for RC structures in chloride environments, Journal of Bridge Engineering, 17(2) (2011) 353-362. | ||
|
آمار تعداد مشاهده مقاله: 946 تعداد دریافت فایل اصل مقاله: 1,224 |
||