Structural Engineering and Mechanics

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Influence of high axial compression ratios in RC columns on the seismic response of MRF buildings

  • Sergio Villar-Salinas (Civil and Environmental Engineering Department, Universidad Tecnologica de Bolivar, Campus Tecnologico km 1 Via Turbaco) ;
  • Sebastian Pacheco (Engineering/Research Department, PCEM SAS) ;
  • Julian Carrillo (Department of Civil Engineering, Universidad Militar Nueva Granada) ;
  • Francisco Lopez-Almansa (Department of Architecture Technology, Universitat Politecnica de Catalunya-BarcelonaTech (UPC))
  • Received : 2023.03.21
  • Accepted : 2024.04.03
  • Published : 2024.04.10
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Abstract

Poorly designed reinforced concrete (RC) columns of actual moment-resisting frame (MRF) buildings can undergo Axial Compression Ratios (ACR) so high as their demand exceeds their capacity, even for serviceability gravity load combinations, this lack commonly leads to insufficient seismic strength. Nonetheless, many seismic design codes do not specify limits for ACR. The main contribution of this research is to investigate the need to limit the ACR in seismic design. For this purpose, three prototype 6 and 11-story RC MRF buildings are analyzed in this paper, these buildings have columns undergoing excessive ACR, according to the limits prescribed by standards. To better that situation, three types of alterations are performed: retrofitting the abovementioned overloaded columns by steel jacketing, increasing the concrete strength, and reducing the number of stories. Several finite element analyses are conducted using the well-known software SAP2000 and the results are used for further calculations. Code-type and pushover analyses are performed on the original and retrofitted buildings, the suitability of the other modified buildings is checked by code-type analyses only. The obtained results suggest that ACR is a rather reliable indicator of the final building strength, hence, apparently, limiting the ACR in the standards (for early stages of design) might avoid unnecessary verifications.

Keywords

Acknowledgement

The first author greatly appreciates the financial support from Fundacion Carolina and Universidad Tecnologica de Bolivar during his Doctoral research. Besides, the help of PCEM SAS with the drafting of some figures is thankfully acknowledged. The authors acknowledge each filiation institution, for facilitating or financing research activities.

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