Abstract
Bearing strength of concrete is important design criteria to transmit load safely to concrete supports especially in column-foundation, corbel, bridge pedestal, support anchorage, post-tension member and other types of structure supports. Most of existing formula for concrete bearing is mainly related to its compressive strength and steel-to-concrete area ratios. Effect of different heights of concrete supports on concrete bearing is not clearly explained. Therefore, this paper is carried out to investigate the effect of concrete bearing for different heights of concrete blocks under the compression load. The confinement effects of concrete bearing on different height is also determined. Experimental results indicate that the confinement effect and bearing strength of concrete are decreased with increasing of concrete blocks heights due to slenderness effects.
Highlights
Bearing strength of concrete is important design criteria when designing any structure supports such as concrete footing, bridge pedestals, corbels, anchorage zone, construction fixing, bridge bearing and in post-tension members
Experimental results indicate that the confinement effect and bearing strength of concrete are decreased with increasing of concrete blocks heights due to slenderness effects
Based on the current relationship of and (h/w), a new prediction of concrete bearing can be predicted as: fb f where fb is bearing of concrete, fc' is compressive strength of concrete, h is the height of concrete block and w is the width of concrete block
Summary
Bearing strength of concrete is important design criteria when designing any structure supports such as concrete footing, bridge pedestals, corbels, anchorage zone, construction fixing, bridge bearing and in post-tension members. Most of existing formulas in the Australian standard, the American Concrete Institute (ACI) and the AASHTO LFRD for concrete bearing depend on concrete compressive strength and ratio of concrete-to-steel area. The author has developed a cubic root equation for concrete bearing based on testing of rock specimens. Published under licence by IOP Publishing Ltd where fc' is compressive strength of concrete, A1 is unloaded area and A2 is loaded area. Concrete bearing pedestals in bridge is considered as a shallow footing as their height-towidth ratio lesser than 1 as highlighted by Yahya and Dhanasekar (2014, 2017).
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