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

Micael Inácio; Brisid Isufi; Massimo Lapi; António Pinho Ramos

doi:10.14359/51728080

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

Micael Inácio, Brisid Isufi, Massimo Lapi, António Pinho Ramos

DEC - Departamento de Engenharia Civil

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	297-310
Number of pages	14
Journal	Aci Structural Journal
Volume	117
Issue number	6
DOIs	https://doi.org/10.14359/51728080
Publication status	Published - Nov 2020

Keywords

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

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10.14359/51728080

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title = "Rational use of high-strength concrete in flat slab-column connections under seismic loading",

abstract = "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.",

keywords = "Cyclic loading, Flat plate, Flat slab, High-strength concrete, Hybrid, Punching, Seismic loading, Slab-column connection",

author = "Micael In{\'a}cio and Brisid Isufi and Massimo Lapi and Ramos, {Ant{\'o}nio Pinho}",

note = "Funda{\c c}{\~a}o para a Ci{\^e}ncia e Tecnologia -Minist{\'e}rio da Ci{\^e}ncia, Tecnologia e Ensino Superior through projects EXPL/ECM -EST/1371/2013 ; PTDC/ECI-EST/30511/2017 and scholarship number SFRH/BD/76242/2011. The authors are grateful to Concremat for making the specimens, CIMPOR for providing the cement, and Sika for providing VISCOCRETE 20HE and SIKACRETE HD.",

year = "2020",

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doi = "10.14359/51728080",

language = "English",

volume = "117",

pages = "297--310",

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AU - Inácio, Micael

AU - Isufi, Brisid

AU - Lapi, Massimo

AU - Ramos, António Pinho

N1 - Fundação para a Ciência e Tecnologia -Ministério da Ciência, Tecnologia e Ensino Superior through projects EXPL/ECM -EST/1371/2013 ; PTDC/ECI-EST/30511/2017 and scholarship number SFRH/BD/76242/2011. The authors are grateful to Concremat for making the specimens, CIMPOR for providing the cement, and Sika for providing VISCOCRETE 20HE and SIKACRETE HD.

PY - 2020/11

Y1 - 2020/11

N2 - 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.

AB - 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.

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

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Keywords

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