structural rehabilitation
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Buildings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 79
Author(s):  
Alessandra Aprile ◽  
Giorgio Monti

Structural rehabilitation has globally become an urgent need due to both widespread construction obsolescence and more demanding requirements from modern construction codes, especially in earthquake-prone areas, where upgrading the existing constructions has become a primary goal [...]


2021 ◽  
Author(s):  
Jerin Mathew George ◽  
Mehrdad Kimiaei ◽  
Mohamed Elchalakani

Abstract Fixed and Floating Offshore structures commonly utilize I-beams as structural components withstanding distributed loads on their decks or inside hulls. These structural members get damaged due to the corrosive marine environment leading to a condition in which they need replacement or rehabilitation. Such situations are not desirable as it will incur monetary losses directly with replacement or repair costs and indirectly through operational losses due to shut down for hot repair works. A safe and economical alternative for structural rehabilitation of damaged I-beams is using Fibre Reinforced Polymer (FRP) composites. An experimental investigation on the feasibility of repair of a heavily damaged I-beam using two different types of FRPs is presented. The severe damage in the I-beam was artificially introduced by removing both flanges and the web for 300 mm in the mid-span of 1800 mm long I-beam. Four-point bending tests under static loads were performed until failure of the beam. The first repair was done using carbon fibre reinforced polymers (CFRPs) and the second one utilized glass fibre reinforced polymers (GFRP). The CFRP repaired specimen showed 277% improvement from the damaged state whereas the GFRP repair improved 248% in terms of the ultimate strength. A comparison of the behaviour between CFRP and GFRP repair is also highlighted in the study. Various parameters like stiffness, ductility, load-displacement behaviour and failure modes of these FRP repairs for damaged I-beams are discussed in detail. Overall, the results from the study portray the adequacy of an FRP rehabilitation to reinstate the strength from such structural damages in I-beams.


Author(s):  
Pedro Almeida ◽  
Maruska L. S. Holanda ◽  
Ronaldo O. Almeida

<p>The structural rehabilitation of bridges is generally motivated by the premature aging of the structures and the increased daily traffic of vehicles. In the case of the Costa e Silva Bridge, the rehabilitation was conceived by the Federal District Government due to the partial collapse of the viaduct over the “Galeria dos Estados”, occurred in February 2018, with the same age and the same structural system and due to the relevance for Brasília's transportation system. Also, it was designed by the renowned architect Oscar Niemeyer and the only one designed by him that was built. The bridge is part of the world heritage site of the &quot;Plano Piloto&quot; of Brasília, by UNESCO. The investigation of the structural behavior of the bridge, to verify the need for rehabilitation, was made from visual inspections, geometric and topographic surveys, photographic records, extraction of samples of concrete, analysis of the original building design and after some occurrences along the way of time, structural monitoring. As a result of these investigations, several damages were identified, in particular: cracks in the webs of the box girders, concreting failures, increased permanent overload due to the thickness of the current pavement layer, leaching of concrete and, mainly, approximately 40 cm of deflection at cantilever beams. All of these damages were simulated in the numerical model of the bridge, proving that the excessive deflection at central span is resulted in the loss of prestressing due to stress corrosion and fatigue, reducing structural stiffness and can lead to sudden collapse. As the solution for rehabilitation of the structure was designed a reinforcement with external prestressing to reduce the cracking process and to neutralize the loss of prestressing, due to strands corrosion that can result in broken wires.</p>


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