Evaluating Load-Carrying Capacity of Short Composite Beam Using Strain-Hardening HPFRC

• Published in: KSCE journal of civil engineering Vol. 25; no. 4; pp. 1410 - 1423
• Main Authors: Nguyen, Duy-Liem, Tran, Vu-Tu, Tran, Ngoc-Thanh, Ngo, Tri-Thuong, Nguyen, Manh-Tuan
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Civil Engineers 01.04.2021; Springer Nature B.V; 대한토목학회
• Subjects: Bearing strength; Carrying capacity; Civil Engineering; Composite beams; Compressive strength; Deformation; Engineering; Fiber reinforced concretes; Geotechnical Engineering & Applied Earth Sciences; Hybrid systems; Industrial Pollution Prevention; Load carrying capacity; Mechanical properties; Reinforced concrete; Shear; Shear strength; Strain; Strain hardening; Structural Engineering; 토목공학; High performance; Hybrid fiber; Composite beam; Short beam; Shear resistance
• ISSN: 1226-7988; 1976-3808
• DOI: 10.1007/s12205-021-1327-8

The main goal of this study was to develop the short composite beams using strain-hardening fiber-reinforced concrete (S_HPFRC) and conventional concrete (CC) together. Firstly, the sensitivity of the hybrid fiber system to the enhancement of mechanical properties of plain high performance concrete (P_mortar) was experimentally studied. The ranking of the mechanical properties in terms of sensitive coefficient was observed as follows: direct tensile > splitting tensile > compressive. Next, the responses of short composite beams with various thicknesses of S_HPFRC were investigated under a three-point bending test (3PBT). Six beams with no reinforcement (type A) and six beams with reinforcement were tested (type B) with their identical dimensions of 150 × 150 × 300 mm (depth × width × span length). The compressive strength of S_HPFRC and CC were about 80.65 MPa and 21.12 MPa, respectively. Most of the composite beams were observed to fail in shear mode. And, there was a favorable effect on enhancing the load-carrying capacity of a beam as S_HPFRC was placed at a critical tensile zone. Finally, based on the test data, the analytical equations were proposed for the purpose of predicting shear resistance of the S_HPFRC — CC beam.