Strengthen Concrete Structures: Numerical Analysis

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In order to verify the results from the studies and testing’s that have been carried theoretical analysis is done via calculations to compare the answers. The numerical analysis that was carried out followed guidelines set by American Concrete Institute Committee (ACI Committee), their report entitled ‘Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures’ produced the guidelines and equations that each of the studies previously mentioned followed.
In this report analysis of external FRP wrap can be broken into two separate categories; strength and strain.
When calculating the compressive strength and strain in a member 5 main equations are used:
The ultimate strain of confined concrete is defined as:
ε_fe=0.0119-0.0205ρ_f …show more content…

In order to predict the peak strength of concrete with external FRP of different unconfined strengths Riad Benzaid and Habib-Abdelhak Mesbah propose an equation based on the results that were obtained in Table 4.4. Figure 4.8 displays the interaction between fl,eff /f’co and f’cc/f’co. It can be observed that the strength ratio is proportionate to the volumetric ratio and the effective lateral confining pressure of the FRP is inversely proportionate to the unconfined concrete strength. Hence a linear graph is produced. Figure 4.8 Strengthing Ratio Vs Actual Confinement

The following equation can be used to establish the trend line:
〖f'〗_cc/〖f'〗_co =1+2.20 f_(l,eff)/〖f'〗_co
Equation 9
Where;
f’cc = the compressive strength of the confined concrete; f’co = the compressive strength of the unconfined concrete; fl,eff = effective maximum lateral confining

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