Title: Rational Use of High-Strength Concrete in Flat Slab- Column Connections under Seismic Loading
Author(s): Micael Inácio, Brisid Isufi, Massimo Lapi, and António Pinho Ramos
Publication: Structural Journal
Appears on pages(s): 297-310
Keywords: cyclic loading; flat plate; flat slab; high-strength concrete; hybrid; punching; seismic loading; slab-column connection
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.