Assessment of seismic retrofitting interventions in reinforced concrete structures

Abstract

Destruction of reinforced concrete (RC) structures, particularly non-ductile RC structures, in recent earthquakes demonstrate their vulnerability under lateral forces generated in an earthquake. Despite the extensive literature on the subject and the wide variety of strengthening techniques available, there is no consensus on the efficiency of these techniques in improving the seismic performance of RC structures. In this study, a five-storeyed RC- framed building is considered to evaluate its seismic performance through static non-linear pushover analysis. To examine the effect of various cases encountered in practice, the pushover analysis is carried out on the RC frame for various cases, i.e. a bare RC frame, an RC frame with masonry infills but with an open ground storey, and RC frames with shear walls with a variety of thicknesses and steel reinforcement ratios. Further, to investigate the effect of retrofitting, the RC frame is strengthened using local jacketing and bracings. From the results, it is observed that the initial stiffness and base shear of masonry infilled RC frame with an open ground storey exhibit an increase of 2.6%, and 19%, respectively, as compared to the bare frame. The use of shear walls increases the initial stiffness and base shears, and they increase by 6-14% and 8-20%, respectively, with an increase in the reinforcement ratio in the shear wall. Retrofitting with the use of both diagonal bracings causes the base shear to increase by a factor of 7.7 as compared to that of the open ground storey. Finally, the probability of damage to the RC frame in all cases was compared using seismic fragility curves.

Keywords

Reinforced concrete / Pushover analysis / Base shear / Retrofitting / Damage

References

[1] F.M. Wani, J. Vemuri, C. Rajaram, Effect of soil structure interaction on the dynamic response of reinforced concrete structures, Natural Hazards Res. 2 (4) ( 2022) 304-315.

[2] J. Vemuri, S. Kolluru,Evaluation of ground motion scaling techniques, Advances in Computer Methods and Geomechanics: IACMAG Symposium 2019 ume 1 ( 2020) 525-535 (Springer Singapore).

[3] Arlekar S.K. Jain C.V.R. Murty, Seismic response of RC frame buildings with soft first storeys, in: Proceedings of the CBRI Golden Jubilee Conference on Natural Hazards in Urban Habitat, New Delhi, 1997.

[4] D.R. Sahoo, D.C. Rai, Design and evaluation of seismic strengthening techniques for reinforced concrete frames with soft ground storey, Eng. Struct. 56 ( 2013a), 1993-1944.

[5] H.B. Kaushik, D.C. Rai, S.K. Jain, Effectiveness of some strengthening options for masonry infilled RC frames with open first storey, J. Struct. Eng. 135 (8) ( 2009) 925-937.

[6] D.R. Sahoo, D.C. Rai, Seismic strengthening of non-ductile reinforced concrete frames using aluminum shear links as energy-dissipation devices, Eng. Struct. 32 (11) ( 2010) 3548-3557.

[7] J.M. Kelly, R.I. Skinner, A.J. Heine, Mechanisms of energy absorption in special devices for use in earth-quake resistance structures, Bull N.Z, National society for earthquake Engineering 5 (3) ( 1972) 63-88.

[8] R.J. Skinner, J.M. Kelly, A.J. Heine, Hysterisis dampers for earthquake resistant structures, Earthq. Eng. Struct. Dynam. 5 (3) ( 1975) 287.

[9] R.G. Tytler, Tapered steel energy dissipaters for earthquake resistant structures, Bull NZ Nat soc, Earthquake engineering 11 (4) ( 1978) 282-294.

[10] R.H. Zhang, T.T. Soong, " Seismic design of viscoelastic dampers for structural applications ”, Journal of Structural Engineering, ASCE 118 (5) ( 1992) 1375-1392,1992.

[11] T.T. Soong, G.F. Dargush, Passive Energy Dissipation Systems in Structural Engineering, Wiley & Sons, Chichester, 1997.

[12] M.C. Constantinou, P. Tsopelas, W. Hammel, A.N. Siaher, Toggle-brace-damper seismic energy dissipation systems, Journal of Structural Engineering, ASCE 127 (2) ( 2001) 105-112.

[13] ASCE, Seismic Evaluation and Retrofit of Existing Buildings ASCE 41, ASCE, Reston, VA, 2013.

[14] P. Negro, G. Verzeletti, Effect of infills on the global behavior of RC frames: energy considerations from pseudo-dynamic tests, Earthq. Eng. Struct. Dynam. 25 ( 1996) 753-773.

[15] K.M. Mosalam, R.N. White, P. Gergely, Static response of infilled frames using quasi-static experimentation, J. Struct. Eng. 123 ( 1997) 1462-1469.

[16] F. Colangelo, Pseudo-dynamic seismic response of reinforced concrete frames infilled with non-structural brick masonry, Earthq. Eng. Struct. Dynam. 34 ( 2005) 1219-1241.

[17] H. Alidad, K.M. Mosalam, Shake-table experiment on reinforced concrete structure containing masonry infill wall, Earthq. Eng. Struct. Dynam. 35 ( 2006) 1827-1852.

[18] G. Mihali, H. Viktor, T. Kosta, S. Marta, Experimental investigations of 1/ 3 scale RC frame with infill walls building structures,in: Proc. Of 13th World Conference On Earthquake Engineering, Vancouver BC, Canada, 2004. Paper No. 772.

[19] H. Ozkaynak, The Earthquake Behavior of RC Frames with Fiber Polymer Confined Infill Walls and Their Structural Damping Properties, Ph.D. Thesis, Istanbul Technical University, Istanbul, 2010.

[20] T.C. Grimm, Strength and related properties of brick masonry, J. Struct. Eng. 101 ( 1975) 217-232.

[21] W.S. McNary, D.P. Abrams, Mechanics of masonry in compression, J. Struct. Eng. 111 ( 1985) 857-870.

[22] T. Paulay, M.J.N. Priestley, Seismic Design of Reinforced Concrete and Masonry Buildings, Wiley-Interscience, New York, 1992.

[23] R.M. Bennett, K.A. Boyd, R.D. Flanagan, Compressive properties of structural clay tile prisms, J. Struct. Eng. 123 ( 1997) 920-926.

[24] M.J.N. Priestley, D.M. Elder, Stress-strain curves for unconfined and confined concrete masonry, American Concrete Institute Journal 80 ( 1983) 192-201.

[25] F. Sawko, M.A. Rouf, On the stiffness properties of masonry, Proc. Inst. Civ. Eng.,Part 2. Res. Theory 77 ( 1984) 1-12.

[26] B.D. Ewing, M.J. Kowalsky, Compressive behavior of unconfined and confined clay brick masonry, J. Struct. Eng. 130 ( 2004) 650-661.

[27] B.K. Hemant, C.R. Durgesh, K.J. Sudhir, Acase for use of dynamic analysis in designing for earthquake forces, Curr. Sci. 91 ( 2006) 874-877.

[28] M. Goutam, K.J. Sudhir, Lateral stiffness of masonry infilled RC frames with central openings, Earthq. Spectra 24 ( 2008) 701-723.

[29] D. Archanaa, R. Pradeep Kumar, Inelastic response of RC moment resisting frames with URM infills, in: Proc. Of 15th World Conference On Earthquake Engineering,Lisbon, Portugal, 2012. Paper No. 1085.

[30] P.V.S. Neelima, Critical Issues in Design of RC Frames with Unreinforced Brick Masonry Infills in Higher Seismic Zones in India, MS by Research Thesis, International Institute of Information Technology, Hyderabad, India, 2013.

[31] S. Bhargavi, Comparison of Seismic Performance of Brick Masonry RC Frames with Lintel and Lintel Band, MS by Research Thesis, International Institute of Information Technology, Hyderabad, India, 2015.

[32] Chenna Rajaram, Aswini Reddy Teegala, Renuka Devi Kummara,Ramancharla Pradeep Kumar, Vulnerability assessment of coastal structure: a case study on light houses, J.Inst.Engineers India 98 ( 2017) 135-153.

[33] A.O. Tulay, K. Ahmet, B. Muzaffer, Z. Basak, Kocakc, Effect of shear wall on seismic performance of RC frame buildings, Eng. Fail. Anal. 100 ( 2019) 60-75.

[34] A.M. Reinhorn, H.S. Roh, M.V. Sivaselvan, S.K. Kunnath, R.E. Valles, A. Madan, C. Li, R. Lobo, Y.J. Park, IDARC2D Version 7.0: A Program for the Inelastic Damage Analysis of Structures, Technical Report MCEER, University at Buffalo, SUNY, 2009.

[35] Bureau of Indian Standards, Indian Standard Plain and Reinforced Concrete Code of Practice, 2000. IS:456-2000, New Delhi.

[36] D.C. Kent, R. Park, Flexural members with confined concrete, J. Struct. Div. 97 (7) ( 1971) 1969-1990.

[37] J. Vemuri, T. Anwar, K.V. Subramaniam, Seismic fragility assessment of load- bearing soft-brick unreinforced masonry piers, J.Safety Sci.Resilience 3 (4) ( 2022) 277-287.

[38] Jayaprakash Vemuri, Ehteshamuddin Syed, Meharbabu Ravula, Subramaniam Kolluru, Pushover analysis of soft brick unreinforced masonry walls using analytical and numerical approaches, in: Materials Today: Proceedings, vol. 28, 2020, pp. 420-425.

[39] J. Vemuri, S. Ehteshamuddin, S. Kolluru, Numerical simulation of soft brick unreinforced masonry walls subjected to lateral loads, Cogent Eng. 5 (1) ( 2018), 1551503.

[40] M.V. Sivaselvan, A.M. Reinhorn, Hysteretic models for deteriorating inelastic structures, J. Eng. Mech. 126 (6) ( 2000) 633-640.

[41] C.C. Repapis, C.A.( Zeris, Seismic assessment of non-conforming infilled RC buildings using IDA procedures, Front. Built Environ 4 ( 2018) 88.

[42] Bureau of Indian Standards, Indian Standard Ductile Detailing of Reinforced Concrete Structures Subjected to Seismic Forces - Code of Practice, 2016. IS:13920-2016, New Delhi.

[43] Federal Emergency Management Agency (FEMA), Evaluation of Earthquake Damaged Concrete and Masonry Wall Buildings: Technical Resource, FEMA, vol. 307, Applied Technology Council, USA, 1998.

[44] M. Shinozuka, M.Q. Feng, J. Lee, T. Naganuma, Statistical analysis of fragility curves, J. Eng. Mech. 126 (12) ( 2000) 1224.

[45] B. Ellingwood, T. Galambos, Probability Based Load Criteria for American National Standard, National Bureau of Standards, Washington, 1980.

[46] J. Miyakoshi, Y. Hayashi, K. Tamura, N. Fukuwa, Damage ratio functions of buildings using damage data of the 1995 Hyogo-Ken Nanbu earthquake, in: Proceedings of the 7th International Conference on Structural Safety and Reliability, ICOSSAR), 1997, pp. 349-354.

[47] G. Orsini, A model for buildings' vulnerability assessment using the parameter less scale of seismic intensity (PSI), Earthq. Spectra 15 (3) ( 1999) 463-483.