Abstract
This research investigated the performance of lightweight concrete infilled inside steel tubular truss girders. Six specimens of lightweight concrete infilled steel tubular (LWCFST) truss girders were tested. The main variables were the effect of the existence of concrete within the chords and the reinforcing steel bars added into the bottom chord. The lightweight concrete in the bottom chord was reinforced with one or two bars with a nominal diameter of 10 mm, whereas the concrete in the top chord was remained unreinforced. This study demonstration the ultimate loads, flexural strength, load–displacement curves at the mid-span, longitudinal strain curves for chords at mid-span, deflections along the span, and the modes of failure of the tested specimens. The results showed that the existence of the lightweight concrete into the chords increases the strength of the LWCFST truss girder by about 41.2%, also gives them better ductility as compared to the hollow truss girder, and was increased by about 7.6 % to 24.8 % when added reinforcing to concrete in the bottom chord. The adding of reinforcement to the lower of the bottom chord gives the best increase in the ultimate load.
Published Version
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