Punching shear resistance of high-strength concrete slabs

Tuan Ngo

doi:10.56748/ejse.1141

Authors

Tuan Ngo University of Melbourne

DOI:

https://doi.org/10.56748/ejse.1141

Keywords:

Punching shear, Slabs, High-strength concrete, CEB-FIP model code, Design standards

Abstract

The use of high-strength concrete in reinforced concrete slabs is becoming popular in Australia and other countries. Current design provisions of AS3600 and other major codes throughout the world are based on empirical relationships developed from tests on low-strength concrete. In this paper, the experimental results from 4 research studies are used to review the existing recommendations in design codes for punching shear failure of slabs. Design codes referred in this study are AS3600 and CEB-FIP MC 90. In AS3600 the punching shear strength is expressed as proportional to f_c^1/2. However in CEB-FIP MC 90 punching shear strength is assumed to be proportional to f_c^1/3. It is shown that the present provisions in AS3600 are applicable up to 100 MPa.

Downloads

Download data is not yet available.

Author Biography

Tuan Ngo, University of Melbourne

Prof Tuan Ngo is the Research Director of the Building 4.0 CRC, a new $130m initiative to transform the building industry in Australia . He also coordinated the bid to establish of the ARC Training Centre for Advanced Manufacturing of Prefabricated Housing (ARC-CAMPH), a $10m centre focusing on prefabricated buildings on off-site construction where he has worked as the Research Director.

Prof Ngo leads the Advanced Protective Technologies of Engineering Structures (APTES) Research Group which has been recognised as one of the leading centres in advanced materials & structural systems, and physical infrastructure protection in Australia and the Asia Pacific region.

His group has been working closely with industry and government organisations to carry out research in these areas.

Prof Ngo has made a significant contribution to research in vulnerability modelling of critical infrastructure, particularly in the area of assessment of the effects of natural and technical hazards on buildings and infrastructure. He is recognised as an expert in protective technologies for protecting critical infrastructure by many government organisations and industry.

Prof Ngo has been involved in many projects to provide security assessment, risk modelling and protection solutions. These projects include design and strengthening of high-rise buildings, airports, bridges, tunnels, power stations and industrial facilities.

Prof Ngo has carried out significant research collaborations with industry and government agencies to perform large-scale experiments of prefabricated modular components of building structures (facades, wall panels and floor slab systems). The national and international research interactions have given Prof Ngo widespread recognition amongst the scientific community and industry as an expert in design and manufacturing of building components and systems using high performance materials.

Prof Ngo leads a team of researchers in Protective Armoured Systems of the Defence Material Technology Centre (DMTC). His team has developed novel material testing and characterisation techniques and a multi-scale simulation framework for modelling ultra-high strength armour materials and vehicle structural components subjected to extreme mine blasts and ballistic attacks.

Prof Ngo is the winner of the 2013 Eureka Prize for Outstanding Science in Safeguarding Australia. He received the Safeguarding Australia Award for Best Contribution to National Security Technology Research in 2011. He also received the Award for Excellence in Concrete by the Concrete Institute of Australia-Vic Branch in 2017. He is the two-time winner of the University of Melbourne Excellence Award for Industry-engaged Research in 2017 and 2020.

Research expertise:
- Prefabricated modular buildings
- Extreme loadings: blast, impact and fire
- High strength concrete
- Wind engineering and computational fluid dynamics
- Modelling urban systems and design of sustainable precincts

References

Mendis, P. and Pendyala, R. HPC Applications in Australia, 4th International Symposium on Utilization of High-strength/High-performance Concrete. Paris, 1996, pp. 1581-1590.

AS3600: Concrete Structures Standard. Standards Association of Australia, 1994.

CEB-FIP State-of-the-art report on high-strength concrete. 90/1/1, Bulletin d’Information No. 197, 1990.

ACI Committee 318: Building Code Requirements for Reinforced Concrete. Detroit. American Concrete Institute. 1995.

Moe, J. Shearing Strength of Reinforced Concrete Slabs and Footings under Concentrated Loads. Development Bulletin No. D47, Portland Cement Association, Skokie, 1961, 130 pp.

CEB-FIP Model Code 1990. Thomas Telford Ltd., London, 1993.

Ramdane, K.E. Punching Shear of High Performance Concrete Slabs. 4th International Symposium on Utilization of High-strength/High-performance Concrete. Paris, 1996, pp. 1015-1026.

Hallgren, M. and Kinnunen, S. Increase of Punching Shear Capacity by using High-Strength Concrete. 4th International Symposium on Utilization of High-strength/High-performance Concrete. Paris, 1996, pp. 1037-1046.

Marzouk, H. and Hussein, A. Experimental Investigation on the Behaviour of High-Strength Concrete Slabs. ACI Structural Journal, Nov.-Dec., V. 88, No. 6, 1991, pp. 701-713. DOI: https://doi.org/10.14359/1261

Tomaszewicz, A. High-strength Concrete SP2 - Plates and Shells. Report 2.3, Punching Shear Capacity of Reinforced Concrete Slabs. Report No. STF70A93082, SINTEF, Trondheim, 1993.