Abstract
It is well known that the axial load plays an important role in the evaluation of the structural capacity of RC columns. In existing buildings this problem can be even more significant than in new ones, since the material can easily present poor mechanical properties. The paper is aimed at the investigation of the role of the axial load variation on the seismic performance of RC columns of a case-study, i.e. a doubly symmetric 4-storey RC building. The effects of the axial load variation have been checked on the first storey columns, by comparing the seismic response, measured in terms of chord rotation and shear force, with the corresponding capacity. The sensitivity of the seismic performance to the axial load is evaluated with special attention on the type of analysis adopted to determine the seismic response and on considering a wide range of values for the concrete strength. The study points out a non-negligible effect of the axial load variation on the seismic response of the case-study building, especially when combined to concrete strength variability.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Abbasnia R, Mirzadeh N, Kildashti K (2011) Assessment of axial force effect on improved damage index of confined RC beam-column members. Int J Civ Eng 9(3):237–246
Akguzel U, Pampanin S (2010) Effects of variation of axial load and bidirectional loading on seismic performance of GFRP retrofitted reinforced concrete exterior beam-column joints. J Compos Constr 14(1):94–104. doi:10.1061/(ASCE)1090-0268(2010)
Antoniou S, Pinho R (2004) Development and verification of a displacement-based adaptive pushover procedure. J Earthq Eng 8:643
Bosco M, Ghersi A, Marino EM (2009) On the evaluation of seismic response of structures by nonlinear static methods. Earthq Eng Struct Dyn 38(13):1465–1482
Bosco M, Marino EM, Rossi PP (2013) An analytical method for the evaluation of the in-plan irregularity of non-regularly asymmetric buildings. Bull Earthq Eng 11:1423–1445
Cristofaro MT (2009) Metodi di valutazione della resistenza a compressione del calcestruzzo di strutture in c.a. esistenti. PhD dissertation, Università di Firenze
Cristofaro MT, Pucinotti R, Tanganelli M, De Stefano M (2015) The dispersion of concrete compressive strength of existing buildings. In: Cimellaro et al (eds) Computational methods, seismic protection, hybrid testing and resilience in Earthquake engineering. Springer, Switzerland, pp. 275–285
De Stefano M, Tanganelli M, Viti S (2013a) Effect of the variability in plan of concrete mechanical properties on the seismic response of existing RC framed structures. Bull Earthq Eng 11:1049–1060. doi:10.1007/s10518-012-9412-5
De Stefano M, Tanganelli M, Viti S (2013b) On the variability of concrete strength as a source of irregularity in elevation for existing RC buildings: a case study. Bull Earthq Eng 11(5):1711–1726. doi:10.1007/s10518-013-9463-2
De Stefano M, Tanganelli M, Viti S (2014) Variability in concrete mechanical properties as a source of in-plan irregularity for existing RC framed structures. Eng Struct. doi:10.1016/j.engstruct.2013.10.027
De Stefano M, Tanganelli M, Viti S (2015) Torsional effects due to concrete strength variability in existing buildings. Earthq Struct 8(2):379–399
EC 8-3 (2005). Design of structures for earthquake resistance, part 3: strengthening and repair of buildings, European standard EN 1998-3. European Committee for Standardization (CEN), Brussels
Elnashai AS (2001) Advanced inelastic static (pushover) analysis for earthquake applications. Struct Eng Mech 12(1):51–69
Elwood KJ, Moehle JP (2005) Axial capacity model for shear-damaged columns. ACI Struct J 102(4):578–587
Fajfar P (2000) A nonlinear analysis method for performance based seismic design. Earthq Spectra 16(3):573–592
Galal KE, Ghobarah A (2003) Flexural and shear hysteretic behaviour of reinforced concrete columns with variable axial load. Eng Struct 25(11):1353–1367
Iervolino I, Galasso C, Cosenza E (2009a) REXEL: computer aided record selection for code-based seismic structural analysis. Bull Earthq Eng 8:339–362. doi:10.1007/s10518-009-9146-1
Iervolino I, Galasso C, Cosenza E (2009b) Spettri, accelerogrammi e le nuove norme tecniche per le costruzioni. Progett Sism 1(1):33–50
Itaca. (2008). Database of the Italian strong motions data. http://itaca.mi.ingv.it
Kim YJ, Shin HM, Kim TH (2007) Seismic performance assessment of reinforced concrete bridge columns under variable axial load. Mag Concr Res 59(2):87–96. doi:10.1680/macr.2007.59.2.87
Mander JB, Priestley MJN, Park R (1988) Theoretical stress-strain model for confined concrete. J Struct Div ASCE 114:1804–1826
Mariani V, Tanganelli M, Viti S, De Stefano M (2016) The influence of axial load variation on the seismic performance of rc buildings. Geotechnical, Geological and Earthquake Engineering 2016(40):159–169
Masi A, Santarsiero G, Mossucca A, Nigro D (2014) Influence of axial load on the seismic behavior of rc beam-column joints with wide beam. Appl Mech Mater 508(2014):208–214
NTC (2008) Norme tecniche per le costruzioni. D.M. Ministero Infrastrutture e Trasporti 14 gennaio 2008, G.U.R.I. 4 Febbraio 2008, Roma (in Italian)
Ousalem H, Kabeyasawa T, Tasai A (2004) Evaluation of ultimate deformation capacity at axial load collapse of reinforced concrete columns. In: 13th WCEE, Vancouver, BC, Canada
Saadeghvaziri MA (1997) Nonlinear response and modeling of RC columns subjected to varying axial load. Eng Struct 19(6):417–424
Seismosoft (2013) Seismostruct Version 5.2.2 - A computer program for static and dynamic nonlinear analysis of framed structures. Available online from www.seismosoft.com
Smerzini C, Galasso C, Iervolino I, Paolucci R (2013) Ground motion record selection based on broadband spectral compatibility. Earthq Spectra. doi:10.1193/052312EQS197M
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mariani, V., Tanganelli, M., Viti, S. et al. Combined effects of axial load and concrete strength variation on the seismic performance of existing RC buildings. Bull Earthquake Eng 14, 805–819 (2016). https://doi.org/10.1007/s10518-015-9858-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10518-015-9858-3