Mechanical Performance Test of High-strength Reinforced Concrete Beam Strengthened by CFRP Under Combined Action of Complex Environment and Loading(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年04期
- Page:
- 54-62
- Research Field:
- Publishing date:
Info
- Title:
- Mechanical Performance Test of High-strength Reinforced Concrete Beam Strengthened by CFRP Under Combined Action of Complex Environment and Loading
- Author(s):
- WANG Su-yan; ZHANG Hong-tao; ZHU Fang-fang; LIU Zhen-jie
- State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology
- Keywords:
- CFRP; freeze-thaw cycle; hot and humid environment; sustained load; reinforced concrete beam; durability
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the effects of freeze-thaw cycles, hot and humid environment and sustained loads on the durability of high-strength reinforced concrete beams strengthened with carbon fiber reinforced polymer (CFRP), a total of 15 reinforced concrete beams strengthened by CFRP were fabricated. The structural performances of reinforced concrete beams strengthened with CFRP under the interaction of load and environment were studied and theoretically analyzed. The results show that both hot and humid environment and freeze-thaw cycles have certain degrees of influences on reinforced concrete beams strengthened by CFRP. The effect of environment on the bonding interface deteriorates, and the stiffness of strengthened specimen decreases and the deformation increases. Sustained load will speed up the degradation of reinforced concrete beams strengthened by CFRP in coupled external environment, and the higher the sustained load increases, the more obvious the degradation effect is. Under the same environment, the ultimate bearing capacity of specimen is reduced, and the bearing capacity of specimen decreases as the continuous load increases. Under the action of 150 freeze-thaw cycles and 1 000 h continuously in hot and humid environment, the bearing capacities of specimens under 30% and 60% load grades decrease by 2.5% and 10.2% respectively. The continuous load will accelerate the bending resistance of damaged concrete specimens; the degradation effects on specimens of 500 h continuously in the environment with temperature of 40 ℃, humidity of 98% are larger than those of 150 freeze-thaw cycles.
Last Update: 2018-07-18