Flexural Behavior of Steel Truss Girders Infilled with Self-Compacted Concrete
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2021-11-15
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Abstract
The research goal is to investigate the flexural behavior of Warren vertical truss girders infilled with self-compacting concrete experimentally.
Ten simply supported truss girders including eight concrete filled steel tube (CFST) truss girders and two hollow tube trusses were tested under third-point bending. The test parameters were the presence of concrete infill in the chords, the addition of reinforcing steel to the concrete core in the lower chord, and sectional types (circular and square). The tested specimens were classified into five groups. The first group was a hollow tube with no concrete filling. The second group of specimens was filled with concrete with no reinforcement in the lower chord. The third group of specimens was reinforced with (1Ø10mm) steel bar in the lower chord. The fourth group of specimens was reinforced with (2Ø10mm) steel bars in the lower chord, and the fifth specimen was reinforced with a circular steel tube with a diameter of 55mm and a thickness of 1.0mm. The steel tube section for each group described above was either square section or circular section. The concrete grade of (SCC) that filled the chords of CFST specimens was 50 MPa.
Generally, the test results indicated that the CFST truss girders had higher ultimate load capabilities than their hollow truss girder counterparts. The ultimate load capacities increasing ranged from 50% to 117%. When the square type section of CFST truss girders was compared to the circular type section of CFST truss girders with identical reinforcement, the square type truss was higher in the ultimate load by about (48%- 63%). The adding reinforcement to the self-compacting concrete at the bottom chord increases the CFST strength by about 6 % to 27 %. The best increase in
Abstract
ultimate load comes from adding a circular steel tube by about 15% and 27% for square and circular steel tubes of CFST truss girders, respectively.