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Plastic hinge relocation in concrete structures using the double-slotted-beam system

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Abstract

Several plastic hinge relocation techniques were proposed in the past few decades to avoid the congestion of the transverse steel at the joint, avoid strain penetration into the joint, and maintain the strong-column weak-beam behavior. The challenging aspect of these designs is the level of accuracy in predicting the center of rotation of the beam element, which is a necessary component in the seismic design of reinforced concrete frames. In this research, a newly developed concrete beam-column connection called the double slotted beam (DSB) was developed and used to relocate the plastic hinges in concrete frames, with a high level of accuracy in controlling the location of the center of rotation. Two vertical slots made at the top and bottom fibers of the beam member were introduced in the DSB system to control the location of the center of rotation. The plastic hinge was relocated by moving the vertical slots away from the face of the column. Experimental evaluation of large-scale DSB connections with and without relocated vertical slots showed the excellent performance of the system in achieving high drift capacities, non-tearing action, minimal concrete damage, and reduced bond deterioration in the joint.

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Acknowledgements

The authors would like to acknowledge the University of Calgary and the Natural Sciences and Engineering Research Council of Canada (NSERC) for their financial support towards this research project.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Calgary, Calgary, AB, Canada

    Fadi Oudah & Raafat El-Hacha

Authors
  1. Fadi Oudah
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  2. Raafat El-Hacha
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Corresponding author

Correspondence to Raafat El-Hacha.

Appendix: Instrumentations

Appendix: Instrumentations

Four types of instrumentations were used to monitor the behaviour of the connections during testing; Linear Strain Conversion (LSC) devices, Lasers displacement sensors, and Strain Gauges (SG). The LSC devices measured the concrete deformations and were mounted on the beams, columns, and joints. The lasers displacement sensors measured the displacement of the beam member and were positioned on the laboratory floor. The labels and positions of the LSC and laser devices are shown in Fig. 26. The SGs measured the strain in the steel reinforcement and were mounted on the longitudinal reinforcement in the beam and column, diagonal reinforcement, and stirrups as shown in Fig. 27.

Fig. 26
figure 26

Labels and positions of the LSC and laser devices (all dimensions are in mm)

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Fig. 27
figure 27

Locations of the SGs (all dimensions are in mm)

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Oudah, F., El-Hacha, R. Plastic hinge relocation in concrete structures using the double-slotted-beam system. Bull Earthquake Eng 15, 2173–2199 (2017). https://doi.org/10.1007/s10518-016-0055-9

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