Bearing Strength of Concrete with Carbon Fibre Reinforced Plastic (CFRP) Wrapping Axially Loaded through Circular Plate

N A Yahya,S W Lee,N Md Nor,M R Md Zain,C L Oh

doi:10.13189/cea.2021.091318

Abstract

Bearing strength of concrete is strongly related to contact behaviour when the loaded bearing plate penetrate over limited area of concrete surface. The model of concrete bearing was examined using the three-dimensional (3D) nonlinear explicit finite element micro-model in the ABAQUS/Explicit. The contact interaction between the concrete surface and the steel bearing plate was modelled using Surface to Surface (S-to-S) contact model. For material nonlinearity, the Concrete Damage Plasticity Material Model (CDPM) was adopted to stimulate nonlinear behaviour of concrete. The main objective of this paper is to determine the effects of external reinforcement namely Carbon Fibre Reinforced Plastic (CFRP) wrapping in strengthening the bearing capacity of concrete blocks. The concrete block models are with three different bearing ratios of unloaded-loaded area 2, 4 and 6 were investigated. The FE results have shown that the structural performance of concrete bearing with CFRP external wrapped can increase the axial load capacity up to 30% than normal concrete block without CFRP wrapped. However, the effectiveness of CFRP wrapping is decreased as the concrete bearing ratio is increased. This indicates that the CFRP wrapping is effective for concrete blocks with high contact areas.

Highlights

In building construction, concrete bearing or bearing strength of concrete is normally referred to the capacity of concrete to resist the concentrated of axial force over a limited area, popularly known as bearing area or loaded area
The main aim of this study is to examine the effect of using Carbon Fibre Reinforced Polymer (CFRP) wrapping as an external reinforcement to increase bearing capacity of concrete block in the structural support system
In spite all issues dealing in designing concrete bearing, there is limited fundamental studies have been focused on Carbon Fibre Reinforced Plastic (CFRP) wrapped concrete bearing using FEA

Summary

Introduction

Concrete bearing or bearing strength of concrete is normally referred to the capacity of concrete to resist the concentrated of axial force over a limited area, popularly known as bearing area or loaded area. The steel bearing plate can significantly carry high concentrated load and avoid stress concentration on the concrete surface. Such system is which normally found in concrete support structures such as concrete corbel, concrete bearing, concrete footing and post tension members for the anchorage. The structural mechanics of concrete bearing strength is strongly related to the confinement effect based on the compressive strength of material and the ratio of the concrete surface area to steel loaded area [1,2,3,4,5,6].

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