Numerical Investigation for the Structural Behaviour for Partially-Loaded High Strength Concrete Columns Under Uniaxial Loading

Jabbar, Ahmed H; Hemzah, Sadjad Amir; Saheb, Wajde Shobar

doi:10.63463/kjes1008

	Numerical Investigation for the Structural Behaviour for Partially-Loaded High Strength Concrete Columns Under Uniaxial Loading
Kerbala Journal for Engineering Sciences (KJES)
Article 3, Volume 1, Issue 1, 2021, Pages 32-54 PDF (1.17 M)
Document Type: Research Article
DOI: 10.63463/kjes1008
Authors
Ahmed H Jabbar^* ¹; Sadjad Amir Hemzah²; Wajde Shobar Saheb³
¹جامعة کربلاء-کلیة الهندسة
²Civil Engineering Department. College of Engineering, Kerbala University Karbala,Iraq,
³Karbala University / College of Engineering / Civil Department
Abstract
This research aims to study and validate a numerical model for the structural behavior of partially loaded square high strength reinforced concrete (HSC) columns with an eccentricity of 50 mm from the center (e/h = 0.5) using ABAQUS. For this purpose, nine short HSC columns were used after they strengthened with carbon fiber reinforced polymer (CFRP) sheets in various schemes and tested experimentally in terms of their ultimate strengths and complete response to the load-vertical deflections obtained from a previous research paper under publication to be used to check the integrity of the arithmetic results. Further parameters were then investigated using the verified model, such as the influence of extra CFRP layers, different load eccentricities (e/h), and initial loading ratios. Through rapprochement in the values of both the ultimate load and deflections, the numerical analysis demonstrated a high level of accordance with the experimental findings. Results also showed that increasing the number of CFRP sheets for specimens strengthened comprehensively with CFRP laminates in both transverse and longitudinal directions increased significantly the ultimate load capacity. At the same time, by decreasing the eccentricity ratio (e/h), the maximum strength and deflections for all specimens strengthened fully or partially with CFRP sheets were enhanced. Indeed, the results showed that increasing the initial loading ratios of the strengthened samples led to a decrease in the ultimate load.
Keywords
HSC; ABAQUS; eccentricity load; CFRP laminates; numerical study

References
[1] Parvin A, Brighton DFRP composites strengthening of concrete columns under various loading conditions. Polymers. 2014;6(4):1040-1056. [2] Ammash HK, Hemzah SA Behavior of concrete columns reinforced with steel strip ties. J Eng Appl Sci. 2018;12(23):7345-7350. [3] Jain S, Chellapandian M, Suriya Prakash S Emergency repair of severely damaged reinforced concrete column elements under axial compression: An experimental study. Constr Build Mater. 2017;155:751-761. [4] Talaeitaba SB, Barati E, Eslami A. Retrofitting of reinforced concrete columns using near- surface-mounted steel rebars and fiber-reinforced polymer straps under eccentric loading. Adv Struct Eng. 2020;23(4):687-701. [5] Chellapandian M, Prakash SS, Sharma A Experimental Investigation of the Effectiveness of Hybrid FRP–Strengthened RC Columns on Axial Compression–Bending Interaction Behavior. J ComposConstr. 2019;23(4):04019025. [6] Chellapandian M, Prakash SS, Rajagopal A Analytical and Finite Element Studies on Hybrid FRP Strengthened RC Column Elements under Axial and Eccentric Compression. Compos. Struct. 2017; 184(15): 234–248. [7] Noroozieh E, Mansouri A Lateral strength and ductility of reinforced concrete columns strengthened with NSM FRP rebars and FRP jacket. Int J Adv Struct Eng. 2019;11(2):195- 209. [8] Sarafraz ME, Danesh F New technique for flexural strengthening of RC columns with NSM FRP bars. Mag Concr Res. 2012;64(2):151-161. [9] Hemzah SA, Alyhya WS, Hassan BA Numerical Investigation for the Structural Behaviour of Different Strengthening Techniques for Partially-Loaded Square Self- Compacted Concrete Short Columns. IOP Conf Ser Mater Sci Eng. 2020;928(2). [10] Obaidat YT Evaluation for rc column confined partially with externally frp wrapping sheet using nonlinear fe analysis. Mater Sci Forum. 2019;972 MSF:129-133. [11] Hemzah SA, Alyhya WS, Jabbar AH Rehabilitation of Damaged High Strength Concrete Columns under Uniaxial Forces Using CFRP Sheets. In AIP Conference Proceedings. 2021; (under Publication in AIP and accepted). [12] Ayub T, Shafiq N, Nuruddin MF Stress-strain Response of High Strength Concrete and Application of the Existing Models. Research J Apple Sci, Eng and Techno. 2014;8(10):1174-1190.
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