Reliability of reinforced concrete beams in port structures in the bending ultimate limit state
Reliability of reinforced concrete beams in port structures in the bending ultimate limit state
Keywords:
Cables, dynamic modeling, finite differences, underwater applicationsAbstract
This work aims to study the structural reliability of reinforced concrete port beams design, taking into account the requirements of NBR 6118:2014. The performance of beams under heavy loads in aggressive environments in port areas was considered, verifying the influence of design parameters' variation on the structure's safety. The structural reliability verification was made by evaluating the reliability index using the First Order Reliability Method (FORM). The method FORM was applied to verify the ultimate limit state of bending for the beams designed and with a reduced effective steel area of the tensile reinforcement due to corrosion. Parametric studies were carried out to evaluate the beams' reliability according to the variation of the characteristic compressive strength of concrete, dead load, live load, and tensioned reinforcement rate of corrosion. The results were shown to be coherent, with the reliability index showing a significant decrease for high live loading ratios and major reductions of the tensioned reinforcement cross-sectional area, concluding with the need to review the safety coefficients proposed by the Brazilian standard for live loads.
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