Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Flexural behavior of fire-damaged concrete beams repaired with strain-hardening cementitious composite
Highlights Full-scale reinforced concrete beams were damaged under combined fire and mechanical loads. Strain-hardening cementitious composite is proposed to repair fire-damaged beams. Flexural behavior of the repaired full-scale beams is experimentally investigated. Effects of stirrup ratio and repairing methods on the flexural behavior of beams are studied. Analytical formulae are derived to predict load-carrying capacity of the repaired beams.
Abstract This study proposes a method to repair fire-damaged concrete beams using strain-hardening cementitious composite (SHCC) and investigates their flexural behavior through full-scale tests. Eleven beams with different reinforcement ratios were fabricated. Eight beams were damaged in fire, and six of them were repaired using SHCC or basalt-fiber-reinforced polymer fabric. Three beams were used as control and not exposed to fire. All the beams were tested under four-point bending until failure. The results indicated that the proposed repairing method was capable of increasing the load-carrying capacity, stiffness, and crack resistance of fire-damaged beams. Repairing the side and bottom faces of the fire-damaged beams using SHCC increased the load-carrying capacity by 32%. To promote evaluation and repair of fire-damaged beams in engineering practices, a mechanical analysis was performed to derive engineer-friendly formulae for predicting the load-carrying capacity of repaired beams and validated against test data. This study will promote repair and evaluation of fire-damaged structures using SHCC.
Flexural behavior of fire-damaged concrete beams repaired with strain-hardening cementitious composite
Highlights Full-scale reinforced concrete beams were damaged under combined fire and mechanical loads. Strain-hardening cementitious composite is proposed to repair fire-damaged beams. Flexural behavior of the repaired full-scale beams is experimentally investigated. Effects of stirrup ratio and repairing methods on the flexural behavior of beams are studied. Analytical formulae are derived to predict load-carrying capacity of the repaired beams.
Abstract This study proposes a method to repair fire-damaged concrete beams using strain-hardening cementitious composite (SHCC) and investigates their flexural behavior through full-scale tests. Eleven beams with different reinforcement ratios were fabricated. Eight beams were damaged in fire, and six of them were repaired using SHCC or basalt-fiber-reinforced polymer fabric. Three beams were used as control and not exposed to fire. All the beams were tested under four-point bending until failure. The results indicated that the proposed repairing method was capable of increasing the load-carrying capacity, stiffness, and crack resistance of fire-damaged beams. Repairing the side and bottom faces of the fire-damaged beams using SHCC increased the load-carrying capacity by 32%. To promote evaluation and repair of fire-damaged beams in engineering practices, a mechanical analysis was performed to derive engineer-friendly formulae for predicting the load-carrying capacity of repaired beams and validated against test data. This study will promote repair and evaluation of fire-damaged structures using SHCC.
Flexural behavior of fire-damaged concrete beams repaired with strain-hardening cementitious composite
Li, Xiuling (Autor:in) / Lu, Xi (Autor:in) / Qi, Jianan (Autor:in) / Bao, Yi (Autor:in)
Engineering Structures ; 261
21.04.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| Emerald Group Publishing | 2019
Fatigue behavior of damaged concrete beams repaired with composite material
| DOAJ | 2022