Design Guidelines on the Ultimate Strength of Retrofitted Deep Concrete Coupling Beams by Laterally Restrained Side Plates

Abstract:

Existing deep reinforced concrete (RC) coupling beams with low shear span ratios and conventionally reinforced shear stirrups tend to fail in a brittle manner with limited ductility and deformability under reversed cyclic loading. Experimental and numerical studies have demonstrated the effectiveness of laterally restrained steel plate (LRSP) retrofitting method in improving the seismic performance of deep RC coupling beams. In this way, the deformability and energy dissipation of the retrofitted beams are greatly enhanced. Based on the experimental studies and numerical simulation of LRSP coupling beams, an original design procedure on the ultimate strength of LRSP coupling beams is proposed. The proposed design guidelines consist of seven parts, which are (1) estimation of shear capacity of RC component, (2) estimation of plate size, (3) design of bolt group, (4) estimation of axial force, (5) determination of buckling effect coefficient, (6) shear resistance design of the retrofitted beam, and (7) flexural resistance design of the retrofitted beam.

• Periodical: Applied Mechanics and Materials (Volumes 226-228)
• Pages: 942-948
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.226-228.942
• Online since: November 2012
• Authors: Bei Cheng, Ray K.L. Su, Jian Luo
• Keywords: Deep Coupling Beams, Design Guidelines, Laterally Restrained Steel Plate, Retrofitting

References

[1] R.Park, and T.Paulay, "Reinforced Concrete Structures", John Wiley & Sons, New York, 1975.

[2] K.A. Harries, W.D. Cook, and D.Mitchell, "Seismic retrofit of reinforced concrete coupling beams using steel plates", ACI SP-160, Vol.6(1996), No.1, pp.93-114.

DOI: 10.14359/1548

[3] R.K.L.Su and Y.Zhu, "Experimental and numerical studies of external steel plates strengthened reinforcement concrete coupling beams", Engineering Structures, Vol.27(2005), No.10, pp.1537-1550.

DOI: 10.1016/j.engstruct.2005.04.012

[4] R.K.L.Su and B. Cheng, "Plate strengthened deep reinforced concrete coupling beams." ICE-Structures and Buildings, Vol.164(2011), SB1, pp.27-42.

DOI: 10.1680/stbu.8.00052

[5] B. Cheng and R.K.L.Su, "Retrofit of deep concrete coupling beams by laterally restrained side plates", Journal of Structural Engineering, Vol.137(2011), No.4, pp.503-512.

DOI: 10.1061/(asce)st.1943-541x.0000276

[6] B. Cheng and R.K.L. Su, "Numerical studies of deep concrete coupling beams retrofitted with a laterally restrained steel plate", Journal of Advances in Structural Engineering, Vol. 14 (2011), No.5,pp.903-915.

DOI: 10.1260/1369-4332.14.5.903

[7] T. Paulay, "Coupling beams of reinforced concrete shear walls", Journal of the Structural Division, Vol.97(1971), No. ST3, pp.843-862.

DOI: 10.1061/jsdeag.0002848

[8] Buildings Department, Code of Practice for Structural Use of Concrete 2008 (Second Edition), Buildings Department, The Government of the Hong Kong Special Administrative Region, 2004.

[9] Buildings Department, Code of Practice of the Structural Use of Steel, Buildings Department, The Government of the Hong Kong Special Administrative Region, 2005.