OJCE  Vol.4 No.1 , March 2014
Study of Short Column Behavior Originated from the Level Difference on Sloping Lots during Earthquake (Special Case: Reinforced Concrete Buildings)

The disorders originated from architectural design in buildings, show in different forms. One of them is the level difference originated from lot’s slope which affects structures through short column phenomenon. The great stiffness of short columns enables them to absorb large amounts of structural energy. Inattention of some manuals and regulations such as Earthquake regulations to this phenomenon necessitates paying further attention to it. On this basis, the present study employed experimental modeling and numerical modeling for a four-story reinforced concrete building that involves the analysis of simple 2-D frames of varying floor heights and varying number of bays using a very popular software tool STAAD Pro on both a sloping and a flat lot. Also Sap2000 software had been used to show that the displacement of floors is greater for a flat lot building than a sloping lot building. However, the increase in shear was found to be quite greater in short columns compared to common ones and an enormous moment should be tolerated by sloping lot structures. The greater stiffness of the structure was also revealed by non-linear static (Push-Over) analysis. According to the results, short column are required to have more resistant sections and are suggested to be reinforced with more bars. In addition, more steel should be used as stirrups than as longitudinal bars. Also for existing structures, shear capacity of short columns should be retrofitted by FRP, Steel Jacket or other materials.

Cite this paper
Ramin, K. and Mehrabpour, F. (2014) Study of Short Column Behavior Originated from the Level Difference on Sloping Lots during Earthquake (Special Case: Reinforced Concrete Buildings). Open Journal of Civil Engineering, 4, 23-34. doi: 10.4236/ojce.2014.41003.
[1]   Guan, Y.H., et al. (2011) Study on the Earthquake Disaster Reduction Information Management System and Its Application. International Journal of Intelligent Systems and Applications, 1, 51-57.

[2]   Gourabi, A. and Yamani, M. (2011) Active Faulting and Quaternary Landforms Deformation Related to the Nain Fault. American Journal of Environmental Sciences, 7, 441-447.

[3]   Amiri, A. and Tabatabaei, R. (2008) Earthquake Risk Management Strategy Plan Using Nonparametric Estimation of Hazard Rate. American Journal of Applied Sciences, 5, 581-585.

[4]   Kheyroddin, A. and Amiri, A. (2009) Study of the Effect of Braced Frames Position on Behavior of Duplex Structures with Different Floor Levels Considering the Short Column Phenomenon. Research Bulletin of Seismology and Earthquake, 3, 26-36.

[5]   Murty, C.V.R. (2004) Why Are Short Columns More Damaged during Earthquakes? Indian Institute of Technology Kanpur.

[6]   Moretti, M. and Tassios, T.P. (2007) Behaviour of Short Columns Subjected to Cyclic Shear Displacements: Experimental Results. Engineering Structures, 2, 2018-2029.

[7]   Moretti, M. and Tassios, T.P. (2006) Behaviour and Ductility of Reinforced Concrete Short Columns Using Global Truss Model. ACI Structural Journal, 103, 319-327.

[8]   Colomb, F., Tobbi, H., Ferrier, E. and Hamelin, P. (2008) Seismic Retrofit of Reinforced Concrete Short Columns by CFRP Materials. Composite Structures, 82, 475-487.

[9]   Liang, Q.Q. and Fragomeni, S. (2009) Nonlinear Analysis of Circular Concrete-Filled Steel Tubular Short Columns under Axial Loading. Journal of Constructional Steel Research, 65, 2186-2196.

[10]   Zhou, X. and Liu, J. (2010) Seismic Behavior and Strength of Tubed Steel Reinforced Concrete (SRC) Short Columns. Journal of Constructional Steel Research, 66, 885-896.

[11]   The Regulation for Buildings Design against Earthquake (2006) Iranian Standard No.2800. The Iranian Center for Researches on Building and House, 3rd Edition.

[12]   National Building Regulation, Sixth Topic (2007) Loads on Building. Ministry of Roads and Urban Development, Department of National Building Regulations Affairs.

[13]   Publication 120, Department of Technical Affairs and Criteria Establishment (2002) Iranian Concrete Regulation (ICR). First Revision, The National Organization of Management and Programming.

[14]   Ashimbayev, M.U., Itskov, I.E. and Lobodryga, T.D., (2004) Living with Natural and Technological Hazards, Topic a.2: Reducing Vulnerabilities in Existing Building and Lifelines. Seismic Hazard and Earthquake Engineering, 35, 43-46.

[15]   Paul, D.K. and Kumar, S. (1997) Stability Analysis of Slope with Building Loads. Soil Dynamics and Earthquake Engineering, 16, 395-405. http://dx.doi.org/10.1016/S0267-7261(97)00008-0