Flexural behavior of composite beams of Kagome truss and fiber-reinforced cementitious composites

This paper presents an experimental and analytical study of the flexural behavior of composite beams of Kagome truss and fiber-reinforced cementitious composite (FRCC). Two types of FRCC-highly ductile (HD)-FRCC with a tensile ductility of 6.33 % and high-strength (HS)-FRCC with a compressive strength of 156.8 MPa-were designed. Three composite beams were manufactured. To investigate the flexural behavior of the beams, bending tests were performed. Test results showed that the flexural behavior of the Kagome truss composite beams was influenced by the types of FRCCs and reinforcement methods. The K-HS-HD beam reinforced at the tensile portion with HD-FRCC and at the compressive portion with HS-FRCC showed 4.5 and 4.9 times higher loadbearing capacities than those, respectively, of the K-HD and K-HS beams that were reinforced only at the tension region. While the analytical results and the experimental results were relatively consistent in the case of the beam reinforced with HD-FRCC, the analytical results were different from the experimental results in the nonlinear region in the case of the beam reinforced with HS-FRCC, due to local fracture of the material.

Automated summary

This paper presents an experimental and analytical study on the flexural behavior of composite beams combining Kagome truss and fiber-reinforced cementitious composite (FRCC). The results showed that the type of FRCC and reinforcement method significantly influenced the flexural behavior of the beams. Beams with both highly ductile (HD)-FRCC and high-strength (HS)-FRCC reinforcement in tension and compression regions exhibited higher loadbearing capacities compared to beams reinforced only in the tension region. While the analytical and experimental results were consistent for beams reinforced with HD-FRCC, there were discrepancies in the nonlinear region for beams reinforced with HS-FRCC due to localized material fracture.