Browsing by Author "Hummeid, Mohamad Maher"
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- Analysis of the Structural Efficiency of Arch Bridges with High Strength Concrete Filled TubesPublication . Hummeid, Mohamad Maher; Pinto, Clemente MartinsConcrete-filled steel tubes (CFST) have been increasingly applied in long span arch bridges due to their high compressive strength and efficiency in construction. The objective of this work is to evaluate the efficiency of using high strength concrete in long span CFST arch bridges. Experimental results on the behaviour of CFST elements were collected from literature, aiming to analyze the behaviour of high strength concrete in CFST solutions. The analysis of the results was based on the internal mechanical behaviour and failure mechanism of the concrete core and their effect in the loading capacity of CFST sections. The analysis has shown that the different behaviour between normal and high strength concrete results in different effects concerning the confinement level and the loading capacity of CFST sections. The steel tube changes the cracking process of the concrete core, contributing to an unfavorable failure mode in case of high strength concrete, which reduces the efficiency of the combination of the steel tube and the high strength concrete core. An initial design of a long span railway CFST arch bridge was carried out, considering two combinations of materials, namely normal and high strength materials. The application of high strength materials shows the advantages of reducing the structure self-weight and the materials consumption by about the half when compared to normal strength materials.