Performance of Steel Tube Truss Girder Infilled with Reinforced Lightweight Concrete
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Date
2021-08-11
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Abstract
The objective of the current work is to study the performance of circular and square concrete-filled steel tube (CFST) truss girders (Warren vertical truss type) incorporating lightweight concrete (LWC). Ten CFST specimens with varying shapes and the presence of internal bar reinforcements are tested experimentally under one point loading at the mid-span. The effect of these variables on load-carrying capacity, stiffness, ductility, longitudinal strain and, failure modes, are evaluated through experimental results. The ten specimens were divided into five groups, each group contented from two specimens. The first group of specimens was filled with LWC without any additional reinforcement in the bottom chord, the second group of specimens was filled with LWC with adding the reinforcing to the middle of the bottom chord by using (1Ø10mm) steel bar, the third group of specimens was filled with LWC with added reinforcing to the lower of the bottom chord by using (1Ø10mm) steel bar, the fourth group of specimens was filled with LWC with adding the reinforcing to the middle of the bottom chord by using (2Ø10mm) steel bars, while the fifth group of the specimens was filled with LWC with reinforcing by using (2Ø10mm) which were added to the lower of the bottom chord. The results showed that the trusses with square steel tubes show ultimate load higher than trusses with circular steel tubes by about 21.7% to 25.46%. Also, the CFST strength shows an increase by about 6.3% to 24.8% when has been added reinforcement in the lightweight concrete at the bottom chord. The addition of reinforcement to the lower of the bottom chord gives the best increase in the ultimate load. All the specimens failed in the joint through the testing.