Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Abstract

Beam–column connections are one of the most critical elements of reinforced concrete structures, especially in seismically active regions, and have been extensively evaluated experimentally and numerically. However, very limited experimental studies about eccentric reinforced concrete connections including the effect of connected slabs are available. This study presents the experimental results of two half-scale eccentric beam-column-slab connections subjected to quasi-static cyclic loading. The horizontal eccentricity (e_h) is maintained at 12.5% and 25% of column width (b_c) for specimens 1 and 2, respectively. The damage pattern, performance levels, displacement ductility (μ_D), energy dissipation, and connection strength and stiffness are compared for both specimens, and the effect of eccentricity is evaluated. It is concluded that the eccentricity has no significant effect on the lateral load carrying capacity; however, the overall strength degradation increases with the increase in eccentricity. Similarly, the elastic stiffness of specimen 2 decreased by 14% as the eccentricity increased from 12.5% to 25%; however, the eccentricity had no significant effect on the overall stiffness degradation. μ_D decreased by 43%, and the energy dissipation capacity decreased by 40% in specimen 2 with higher eccentricity. The story drifts corresponding to the performance levels of the life safety (LS) and collapse prevention (CP) were found to be 28% lesser in specimen 2 than in specimen 1.

Graphical abstract

Keywords

corner connection / eccentricity / strength degradation / stiffness degradation / energy dissipation / performance levels

References

[1] Shin M, LaFave J M. Seismic performance of reinforced concrete eccentric beam-column connections with floor slabs. ACI Structural Journal, 2004, 101(3): 403–412

[2] Joint ACI-ASCE Committee 352. Recommendations for Design of Beam-Column Connections in Monolithic Reinforced Concrete Structures (ACI 352R-02). Farmington Hills, MI: American Concrete Institute, 2002

[3] Xing G H, Wu T, Niu D T, Liu X. Seismic behavior of reinforced concrete interior beam-column joints with beams of different depths. Earthquakes and Structures, 2013, 4(4): 429–449

[4] Joh O, Goto Y, Shibata T. Behavior of reinforced concrete beam-column joints with eccentricity. ACI Special Publication, 1991, 123: 317–357

[5] Li B, Pan T C, Tran C T. Effects of axial compression load and eccentricity on seismic behavior of nonseismically detailed interior beam-wide column joints. Journal of Structural Engineering, 2009, 135(7): 774–784

[6] Canbolat B B, Wight J K. Experimental investigation on seismic behavior of eccentric reinforced concrete beam-column-slab connections. ACI Structural Journal, 2008, 105(2): 154–162

[7] Lafave J M, Bonacci J F, Burak B, Shin M. Eccentric beam-column connections. Concrete International, 2005, 27(9): 58–62

[8] Lee H J, Yu S Y. Cyclic response of exterior beam-column joints with different anchorage methods. ACI Structural Journal, 2009, 106(3): 329–339

[9] Behnam H, Kuang J S, Huang R Y. Exterior RC wide beam-column connections: Effect of beam width ratio on seismic behaviour. Engineering Structures, 2017, 147: 27–44

[10] Li B, Kai Q, Xue W. Effects of eccentricity on the seismic rehabilitation performance of nonseismically detailed interior beam wide column joints. Journal of Composites for Construction, 2012, 16(5): 507–519

[11] Chen C C, Chen G K. Cyclic behavior of reinforced concrete eccentric beam-column corner joints connecting spread-ended beams. ACI Structural Journal, 1999, 96(3): 443–449

[12] Raffaelle E G S, Wight J K. Reinforced concrete eccentric beam-column connections subjected to earthquake-type loading. ACI Structural Journal, 1995, 92(1): 45–55

[13] Teng S, Zhou H. Eccentric reinforced concrete beam-column joints subjected to cyclic loading. ACI Structural Journal, 2003, 100(2): 139–148

[14] Kim J, LaFave J M. Key influence parameters for the joint shear behaviour of reinforced concrete (RC) beam-column connections. Engineering Structures, 2007, 29(10): 2523–2539

[15] Hung-Jen L, Jen-Wen K. Eccentric reinforced concrete beam-column connections subjected to cyclic loading in principal directions. ACI Structural Journal, 2007, 104(4): 459–467

[16] Unal M, Burak B. Joint shear strength prediction for reinforced concrete beam-to-column connections. Structural Engineering and Mechanics, 2012, 41(3): 421–440

[17] Vollum R L, Newman J B. Towards the design of reinforced concrete eccentric beam-column joints. Magazine of Concrete Research, 1999, 51(6): 397–407

[18] Parra-Montesinos G J, Wight J K. Prediction of strength and shear distortion in R/C beam-column joints. ACI Special Publications, 2001, 197: 191–214

[19] Goto Y, Joh O. Shear resistance of RC interior eccentric beam-column joints. In: The 13th World Conference on Earthquake Engineering. Vancouver, B.C., 2004

[20] Di Franco M A, Mitchell D, Paultre P. Role of spandrel beams on response of slab-beam-column connections. Journal of Structural Engineering, 1995, 121(3): 408–419

[21] Kusuhara F, Azukawa K, Shiohara H, Otani S. Tests of reinforced concrete interior beam-column joint subassemblage with eccentric beams. In: The 13th World Conference on Earthquake Engineering. Vancouver, B.C., 2004

[22] ACI Committee 318. Building Code Requirements for Structural Concrete and Commentary. Farmington Hills, MI: American Concrete Institute, 2014

[23] Rabczuk T, Belytschko T. Cracking particles: A simplified meshfree method for arbitrary evolving cracks. International Journal for Numerical Methods in Engineering, 2004, 61(13): 2316–2343

[24] Rabczuk T, Belytschko T. A three-dimensional large deformation meshfree method for arbitrary evolving cracks. Computer Methods in Applied Mechanics and Engineering, 2007, 196(29–30): 2777–2799

[25] Zhou S, Rabczuk T, Zhuang X. Phase field modeling of quasi-static and dynamic crack propagation: COMSOL implementation and case studies. Advances in Engineering Software, 2018, 122: 31–49

[26] Zhuang X, Zhou S, Sheng M, Li G. On the hydraulic fracturing in naturally-layered porous media using the phase field method. Engineering Geology, 2020, 266: 105306

[27] Zhou S, Zhuang X, Rabczuk T. Phase-field modeling of fluid-driven dynamic cracking in porous media. Computer Methods in Applied Mechanics and Engineering, 2019, 350: 169–198

[28] Zhou S, Zhuang X, Rabczuk T. Phase field modeling of brittle compressive-shear fractures in rock-like materials: A new driving force and a hybrid formulation. Computer Methods in Applied Mechanics and Engineering, 2019, 355: 729–752

[29] Zhou S, Zhuang X, Rabczuk T. A phase-field modeling approach of fracture propagation in poroelastic media. Engineering Geology, 2018, 240: 189–203

[30] Zhou S, Zhuang X, Zhu H, Rabczuk T. Phase field modelling of crack propagation, branching and coalescence in rocks. Theoretical and Applied Fracture Mechanics, 2018, 96: 174–192

[31] ASHRAF M. Development of low-cost and efficient retrofitting technique for unreinforced masonry buildings. Dissertation for the Doctoral Degree. Pakistan: University of Engineering and Technology Peshawar, 2010

[32] ACI Committee 224. 3R–95. Joints in Concrete Construction. Farmington Hills, MI: American Concrete Institute, 2013

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