Abstract
In this study, experimental tests were performed to evaluate the shear performance of encased steel truss (EST) composite girders that can resist loads at construction and composite stages. Four full-scale EST composite girders were fabricated, where the truss type (Pratt truss and Warren truss) and presence of stirrups were set as main test variables. The test results showed that in specimens applied with the Pratt truss, horizontal shear cracking occurring along the interface between concrete and steel was the dominant failure mode. Based on the crack pattern and failure plane observed from the test, the horizontal shear strengths of the Pratt truss specimens were calculated, which provided conservative results. On the other hand, in the specimens with the Warren truss inside, the strengths of the specimens were governed by the shear failure occurring in the screw rod connecting the truss elements prior to the yielding of the diagonal member. The shear strengths of the Warren truss specimens calculated based on the shear failure of the screw rod were similar to that obtained from the test.
Highlights
Composite structural systems are widely used in construction sites because they afford long spans and reduced floor heights
Steel–concrete composite members with structural performance improved by efficiently utilizing the advantages of concrete and steel [1,2,3,4,5,6,7], prestressed concrete members with flexural and shear performance improved by introducing prestress into concrete with low tensile strength [8,9,10], and composite members applied with fibers and high-performance materials [11,12,13,14,15,16,17,18,19] have been developed hitherto
Because the horizontal shear failure of the member observed in this study was not a desirable failure mode, sufficient horizontal shear strength should be secured by applying Equations (1)–(4) to the design of the encased steel truss (EST) composite girder
Summary
Composite structural systems are widely used in construction sites because they afford long spans and reduced floor heights In this regard, steel–concrete composite members with structural performance improved by efficiently utilizing the advantages of concrete and steel [1,2,3,4,5,6,7], prestressed concrete members with flexural and shear performance improved by introducing prestress into concrete with low tensile strength [8,9,10], and composite members applied with fibers and high-performance materials [11,12,13,14,15,16,17,18,19] have been developed hitherto. Based on the test results, Di et al reported that the use of connections with single
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