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بهسازی اتصالات ضعیف پایه های قابی شکل پل های بتنی با استفاده از کامپوزیت سیمانی الیافی و نبشیهای فولادی | ||
مهندسی زیر ساخت های حمل و نقل | ||
مقاله 5، دوره 4، شماره 3 - شماره پیاپی 15، آذر 1397، صفحه 63-82 اصل مقاله (2.44 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22075/jtie.2018.14636.1306 | ||
نویسندگان | ||
نعمتاله حیدریان1؛ محمد کاظم شربتدار* 2؛ آزاده حقیقت1 | ||
1کارشناس ارشد، دانشکده مهندسی عمران، دانشگاه سمنان | ||
2دانشیار، دانشکده مهندسی عمران، دانشگاه سمنان | ||
تاریخ دریافت: 07 اردیبهشت 1397، تاریخ بازنگری: 19 شهریور 1397، تاریخ پذیرش: 20 شهریور 1397 | ||
چکیده | ||
اتصالات تیر به ستون از نقاط حساس و آسیب پذیر در پایه های قابهای خمشی پل ها هستند و آسیب دیدگی این ناحیه در برابر بارهای جانبی زلزله منجر به کاهش عملکرد لرزهای قاب و افزایش جابهجایی قاب و در نهایت تخریب اعضاء و حتی تخریب کل سازهپل می شود. با توجه به اهمیت چشمه اتصال در این قابها، اجرای صحیح و مطابق جزئیات آیین نامهها تاثیر بسزایی در عملکرد لرزهای قاب دارد. در این مقاله، تاثیر خاموت ناحیه چشمه اتصال در یک اتصال بتن آرمه پایه پل ها با مقیاس یک دوم، به صورت آزمایشگاهی و عددی، تحت بار لرزهای رفت و برگشتی مورد بررسی قرار گرفته و سپس یک اتصال ضعیف دیگر فاقد خاموت در چشمه اتصال، با استفاده از مصالح کامپوزیت سیمانی الیافی توانمند(HPFRCC)، مقاومسازی شده و تاثیر آن در عملکرد اتصال و میزان جبران فقدان خاموت چشمه اتصال بررسی شده است. همچنین به منظور بررسی حالات مختلف تقویت اتصال پایه های پل، هفت نمونه تحلیلی مختلف معرفی شده و تاثیر پانلهای مختلف HPFRCC در بهسازی اتصال و تقویت اتصال بتنی ضعیف توسط نبشیهای پیشتنیده فولادی مورد مطالعه و مقایسه قرار گرفته است. در این تحقیق، منحنی های هیسترزیس بار- تغییرمکان و پوش آنها و منحنی های استهلاک انرژی و سختی و افت سختی اتصالات مورد بررسی قرار گرفته است. نتایج حاکی از افزایش ظرفیت خمشی و شکلپذیری و کاهش سریع افت سختی اتصال در سیکلهای اولیه در اتصال دارای HPFRCC در محل اتصال، نسبت به اتصال فاقد خاموت در چشمه اتصال قاب های بتنی پلها بوده است. استفاده از پانلهای کامپوزیتی سیمانی با الیاف توانمند، ماکزیمم ظرفیت باربری اتصال پایه پل بتنی را نسبت به اتصال ضعیف از 17 تا 48 درصد، افزایش داد. | ||
کلیدواژهها | ||
اتصال خمشی بتن آرمه؛ کامپوزیت سیمانی الیافی توانمند؛ شکلپذیری؛ نبشی پیش تنیده؛ پایه های پل | ||
عنوان مقاله [English] | ||
Retrofitting of Deficient Connections in Frame-Shape Piles of RC Bridges using Fiber Cementitious Composites and Steel Angles | ||
نویسندگان [English] | ||
Neamat Heydarian1؛ M. Kazem Sharbatdar2؛ Azadeh Haghighat1 | ||
1M.Sc. of Structural Engineering, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran. | ||
2Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran. | ||
چکیده [English] | ||
Beam-column connections are vulnerable areas of reinforced concrete moment frames-shapes of bridge piles and damaging of this area under the earthquake loads results in decreasing of seismic performance of frame and increasing of frame drift and eventually destruction of members and even the entire bridge structure. Due to the importance of connection zones in these frames, correct implementation based on regulations has significant impact on seismic performance of the frame. In this paper, the influence of stirrup of panel zone in a concrete connection of bridge piles with a scale of one-half has been conducted experimentally and numerically under cyclic seismic loading and then another deficient connection without any stirrup in the panel zone has been reinforced by high-performance fiber-reinforced cementitious composites (HPFRCC), and its effect on connection performance and compensation of the lack of stirrup of the panel zone has been studied. Also, to evaluate different states of connection strengthening of bridge piles, seven different analytical samples have been presented and the influence of different panels of HPFRCC on connection improvement and in strengthening the weak concrete connection by prestressed steel angels has been studied and compared. In this study, the hysteresis curves of load-displacement and their envelope curves and also energy dissipation, stiffness and stiffness loss curves of the connections have been studied. Results indicated that increasing the flexural capacity and ductility and rapid decreasing in stiffness-loss of connection in primary cycles of connection retrofitted with HPFRCC were more than those of the connection without stirrup in connection zone of bridge frame-shape piles. Maximum capacity of deficient connection of RC bridge piles was increased by 17-48% using high performance fiber reinforced cementitious composite (HPFRCC) panels. | ||
کلیدواژهها [English] | ||
Reinforced concrete moment connection, HPFRCC, ductility, Prestressed angel, Bridge piles | ||
مراجع | ||
Bedirhanoglu, I., Ilki, A. and Kumbasar, N., "Precast Fiber Reinforced Cementitious Composites for Seismic Retrofit of Deficient RC Joints" Journal of Engineering Structure, Vol. 52, pp.192–206, 2013. Canbolat, B. A., Parra-Montesinos, G. J. and Wight, J. K., "Experimental Study on the Seismic Behavior of High-Performance Fiber Reinforced Cement Composite Coupling Beams", Structural Journal, 102(1), PP.159-166, 2005. Cho, C. G., Kim, Y. Y., Feo, L. and Hui, D., "Cyclic Responses of Reinforced Concrete Composite Columns Strengthened in the Plastic Hinge Region by HPFRC Mortar" Journal of Composite Structure, Vol. 94, No. 7, pp. 2246–2253, 2012. Choi, H. K., Park, B. K., Bae, B.I. and Choi, C.S., "Lateral Resistance of Unreinforced Masonry Walls Retrofitted with ECC" Journal of the Architectural Institute of Korea Structure & Construction, Vol. 26, No. 12, pp. 3–10, 2010. Emami, E., "Cyclic Performance of Retrofitted Reinforced Concrete Beam- Column Joints Using Steel Prop" M.Sc Thesis, Department of Structural Engineering, Semnan University, 2010. (in Persianفارسی ). Fischer, G. and Li, V.C., "Effect of Matrix Ductility on Deformation Behavior of Steel Reinforced ECC Flexural Members under Reversed Cyclic Loading Conditions "ACI Structural Journal, Vol. 99, No. 6, pp. 781-790, 2002. Hemmati, A., "Investigation of Flexural Behavior of HPFRCC Beams and Frames" PhD Thesis, Department of Structural Engineering, Semnan University, 2013. (in Persianفارسی ). Hemmati, A., Kheyroddin, A., Sharbatdar, M.K., Park, Y. and Abolmaali, A., "Ductile Behavior of High Performance Fiber Reinforced Cementitious Composite (HPFRCC) Frames" Journal of Construction and Building Materials,Vol. 115, pp.681–689, 2016. Hemmati, A., Kheyroddin, A. and Sharbatdar, M.K., "Plastic Hing Rotation Capacity of Reinforced HPFRCC Beams" ASCE's Journal of Structural Engineering,Vol. 141, No. 2, 2015. Hemmati, A., Kheyroddin, A. and Sharbatdar, M.K.," Using HPFRCC for Increasing the Capacity of R.C Frame " Journal of Sharif Civil Engineering, Vol. 29, No. 3, pp. 97–106, 2012. (in Persianفارسی ). Kim, J.H.J., Lim, Y.M., Won, J.P., Park, H.G. and Lee, K.M., "Shear Capacity and Failure Behavior of DFRCC Repaired RC Beams at Tensile Region" Journal of Engineering Structure, Vol. 29, No. 1, pp. 121–131, 2007. Lavorato, D., Bergami, A.V., Nuti, C., Briseghella, B., Xue, J., Tarantino, A.M., Marano, G.C., Santini, S., "Ultra-High- Performance Fiber- Reinforced Concrete Jacket for the Repair and the Seismic Retrofitting of Italian and Chinese RC Bridges" 6th ECCOMAS Thematic Conference , 2017. Maalej, M., Ahmed, S. F. U. and Paramasivam, P., "Corrosion Durability and Structural Response of Functionally-Graded Concrete Beams", JCI International workshop on ductile fiber reinforced Cementitious composites (DFRCC)-Application and Evaluation, Japan, PP. 161-170, 2002. Maheri, M. R., Karihaloo, B. and Alaee, F. J., "Seismic Performance Parameters of RC Beams Retrofitted by CARDIFRC" Journal of Engineering Structures, 26, pp. 2069-2079, 2004. Park, W. S., Kim, J. E., Kim, S. W., Yun, S.H., Eom, N.Y. and Yun, H.D., "Panel Shear Strength of Steel Coupling Beam-Pseudo Strain Hardening Cementitious Composite Wall Connection" Journal of Applied Mechanics and Materials, Vol.328, pp. 965–969, 2013. Parra-Montesinos, G.J., Peterfreund, S.W. and Chao, S.H., "Highly Damage-Tolerant Beam-Column Joints Through Use of High-Performance Fiber-Reinforced Cement Composites" ACI Structural Journal,102(3), PP. 487-495, 2005. 1- Saghafi, M.H., Shariatmadar, H., Kheyroddin, A., "Experimental Study and Application of High Performance Fiber Reinforced Cementitious Composites for Retrofitting Beam-Column Joints in Rigid-Framed Railway Bridges" Transportation Infrastructure Engineering, Vol. 2, Issue 1, pp. 33-51, 20016. (in Persianفارسی ). Shafaei, J., Hosseini, A. and Marefat, M. S., "Seismic Retrofit of External RC Beam- Column Joints by Joint Enlargement Using Prestressed Steel Angles" Journal of Engineering Structures 81, pp. 265-288, 2014. Shafaei, J., Zareian, M. S., Hosseini, A. and Marefat, M. S., "Effect of Joint Flexibility on Lateral Response of Reinforced Concrete Frames" Journal of Engineering Structures 81, pp. 412-431, 2014. Sharbatdar, M.K., Kheyroddin A. and Emami, E., "Cyclic Performance of Retrofitted Reinforced Concrete Beam- Column Joints Using Steel Prop" Journal of Construction and Building Materials,Vol. 36, pp.287–294, 2012. Tasnimi, A.A. and Salimi, M., "The effect of concrete confinement on the behavior factor of concrete structures" Journal of Engineering, Tarbiat Modares university, Vol.19, Issue 1, 2007. Yoo, C. H., Choi, H. K., Choi, Y.C. and Choi, C.S., "Development of Precast Concrete Beam- Column Connections with Steel Connector and Engineered Cementitious Composite Columns Under Axial Loads" Journal of the Architectural Institute of Korea Structure & Construction, Vol. 29, No. 1, pp. 335-338, 2009. Yun H. D., Byun J. B., Jeon, S. M. and Hwang, S. K., "Compressional Behavior of HPFRCC Columns Under Axial Loads" Journal of the Architectural Institute of Korea Structure & Construction, 22(10), pp. 29–36, 2006. Zhang, R., Matsumoto, K., Hirata, T., Ishizeki, y. and Niwa, J., "Application of PP-ECC in Beam-Column Joint Connections of Rigid-Framed Railway Bridges to Reduce Transverse Reinforcements" Journal of Eng. Struct, 86:146-156, 2015. | ||
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