Rational use of high-strength concrete in flat slab-column connections under seismic loading

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High-strength concrete (HSC) slab-column connections with relatively low concrete strengths compared to today's capabilities have been tested under seismic-type loading in the past. Herein, the hybrid use of HSC with compressive strength approximately 120 MPa and normal-strength concrete (NSC) is investigated through three reversed horizontal cyclic-loading tests with different geometries of the HSC region and a reference NSC specimen. The results show that HSC applied in the vicinity of the column can significantly enhance the seismic performance of slab-column connections. The best result in terms of drift capacity and economic use of HSC was achieved in the case of full-depth HSC extended from the column's face up to 2.5 times the effective depth. Drift ratios up to 3.0% were achieved. A comparison with previous tests showed that the hybrid use of HSC and NSC can achieve similar results to the provision of punching shear reinforcement.

Original languageEnglish
Pages (from-to)297-310
Number of pages14
JournalAci Structural Journal
Issue number6
Publication statusPublished - Nov 2020


  • Cyclic loading
  • Flat plate
  • Flat slab
  • High-strength concrete
  • Hybrid
  • Punching
  • Seismic loading
  • Slab-column connection


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