Computers and Concrete

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Numerical analysis of under-designed reinforced concrete beam-column joints under cyclic loading

  • Sasmal, Saptarshi (Institute for Lightweight Structures and Conceptual Design (ILEK), Universitaet Stuttgart, Germany and Scientist, Structural Engineering Research Centre (SERC), Council for Scientific and Industrial Research (CSIR)) ;
  • Novak, Balthasar (Institute for Lightweight Structures and Conceptual Design (ILEK), Universitaet Stuttgart) ;
  • Ramanjaneyulu, K. (Structural Engineering Research Centre (SERC), CSIR)
  • Received : 2009.09.14
  • Accepted : 2010.03.10
  • Published : 2010.06.25
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Abstract

In the present study, exterior beam-column sub-assemblage from a regular reinforced concrete (RC) building has been considered. Two different types of beam-column sub-assemblages from existing RC building have been considered, i.e., gravity load designed ('GLD'), and seismically designed but without any ductile detailing ('NonDuctile'). Hence, both the cases represent the under-designed structure at different time frame span before the introduction of ductile detailing. For designing 'NonDuctile' structure, Eurocode and Indian Standard were considered. Non-linear finite element (FE) program has been employed for analysing the sub-assemblages under cyclic loading. FE models were developed using quadratic concrete brick elements with embedded truss elements to represent reinforcements. It has been found that the results obtained from the numerical analysis are well corroborated with that of experimental results. Using the validated numerical models, it was proposed to correlate the energy dissipation from numerical analysis to that from experimental analysis. Numerical models would be helpful in practice to evaluate the seismic performance of the critical sub-assemblages prior to design decisions. Further, using the numerical studies, performance of the sub-assemblages with variation of axial load ratios (ratio is defined by applied axial load divided by axial strength) has been studied since many researchers have brought out inconsistent observations on role of axial load in changing strength and energy dissipation under cyclic load.

Keywords

References

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