Structural and Infrastructural Safety
KOLAWOLE ABEJIDE; Jubril Kaura Mohammed; Ibrahim Aliyu; Adamu Lawan; Olugbenga Samuel ABEJIDE
Abstract
This study presents structural damage identification using power spectral density (PSD) approach for reinforced concrete bridge decks at varied deck thicknesses. The effect of vibrations due to the applied load on the bridge decks were examined using finite element analysis (FEA) as coded in ABAQUS CAE ...
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This study presents structural damage identification using power spectral density (PSD) approach for reinforced concrete bridge decks at varied deck thicknesses. The effect of vibrations due to the applied load on the bridge decks were examined using finite element analysis (FEA) as coded in ABAQUS CAE software. AASHTO LRFD design equations were used to evaluate the loadings responsible for the intrinsic stresses generated in the bridge decks during their design period. An increasing decline in the internally resistive stresses was observed as the deck thickness was increased, which is consistent with experimental data. It was observed that the deck thickness has a great effect on the response to vibrations due to the applied loads. The 200mm deck thickness had more response to the effect of the applied load and vibration than the 225mm and 250mm deck thicknesses respectively. This is simply because the increase in thickness of the deck serves as a damper, hence reduces the frequency of excitation in the deck. Most bridge decks in reinforced concrete are generally of 200mm thick, hence, the cracking and frequency of maintenance. Thus, it is economically justifiable to justify increase in deck thickness to at least 225mm or 250mm in order to improve on durability, reduce deck cracks, maintainability, durability, and justify investment of funds. This will also reduce the effect of spalling of concrete and improve bond strength between concrete and the reinforcements.
Stochastic and Statistical Analysis of Structural Resistance and Material
Kolawole Abejide; Jubril Kaurra Mohammed; A. Lawan; Olugbenga Samuel Abejide
Abstract
This study presents the structural reliability of rolled steel beams on offshore platforms exposed to corrosion during their design period and beyond. The rate of corrosion of the rolled steel beam was determined using a standard expression for extreme marine environment. Limit equations were used to ...
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This study presents the structural reliability of rolled steel beams on offshore platforms exposed to corrosion during their design period and beyond. The rate of corrosion of the rolled steel beam was determined using a standard expression for extreme marine environment. Limit equations were used to evaluate the shear performance, deflection, and resistance moment of the rolled steel beams during their design period. The exposure to corrosion was evaluated using the First Order Reliability Method (FORM) in MATLAB with FERUM Version 4.0 (Finite Element Reliability Using Matlab). An increasing decline in the shear, resistance moment, and deflection was observed as the cross sectional area decreased due to corrosion, which is consistent with experimental data. However, it was also noted that the design formulation is robust enough to exceed the design life prediction in the code.
