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Effect of Varying Top Beam Reinforcement Anchorage Details on Ductility of HSC Beam-Column Joints

  • Structural Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

The ductility of external beam-column joints effects seismic behavior of a structure and can be a reason for structural collapse. High strength concrete and large amount of steel present in the joint region reduces the ductility even further. This study presents a radical way of increasing high strength concrete external beam-column joint’s ductility by varying the beam top reinforcement detailing. Two types of joints (three specimens each) were tested, type-1 specimens were prepared as per regular standards while type-2 specimens were prepared by reducing the beam’s top reinforcement anchoring in the column. Load-deflection behavior was studied to observe the stiffness degradation and energy dissipation by joints. Experimental results demonstrated that type-2 specimens were considerably more ductile as compared to type-1 specimens. The energy dissipated by type-2 joints (with 40% less reinforcing bar area in the beam) was 41.5% more than type-1 joints without substantial stiffness degradation. Furthermore, it was observed that by reducing the steel reinforcement in beam, the cracks location changed from inside the joint to beam-column joint’s face which may be attributed for increased ductility in type-2 joints. This study shows that by changing the steel reinforcement detailing near external beam-column joints, fatigue behavior and energy absorption capacity can be enhanced hence providing better performance against seismic activities.

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Authors and Affiliations

  1. Dept. of Civil Engineering, University of Engineering and Technology Lahore, Lahore, 54890, Pakistan

    Ali Ahmed & Muhammad Mazhar Saleem

  2. Dept. of Civil & Architecture Engineering and Mechanics, University of Arizona, Tucson, Arizona, 85721, USA

    Muhammad Mazhar Saleem

  3. Dept. of Civil Engineering, University of Lahore, Lahore, Pakistan

    Zahid Ahmad Siddiqui

Authors
  1. Ali Ahmed
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  2. Muhammad Mazhar Saleem
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  3. Zahid Ahmad Siddiqui
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Correspondence to Ali Ahmed.

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Ahmed, A., Saleem, M.M. & Siddiqui, Z.A. Effect of Varying Top Beam Reinforcement Anchorage Details on Ductility of HSC Beam-Column Joints. KSCE J Civ Eng 23, 2272–2280 (2019). https://doi.org/10.1007/s12205-019-1285-6

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  • DOI: https://doi.org/10.1007/s12205-019-1285-6

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