研究目的
Investigating the effects of initial cracks, CFRP reinforcement, and chloride corrosion on the cracking mechanism, distribution, and shapes of cracks in prestressed concrete beams.
研究成果
CFRP reinforcement constrains crack development, with effects decreasing with height. Crack widths follow normal distribution, with parameters decreasing with height and being smaller in CFRP-reinforced beams. Fractal dimensions increase linearly in unreinforced beams and exponentially in CFRP-reinforced beams with load steps. CFRP increases fractal dimensions under natural conditions, while chloride corrosion's effect is weakened by CFRP.
研究不足
The influence of initial damage degrees on fractal dimension needs further study. The effect of CFRP thickness and layer numbers on constraint height requires additional tests.
1：Experimental Design and Method Selection:
Ten pre-tensioned concrete beams were designed and manufactured, preloaded to crack, reinforced by CFRP, and immersed in chloride condition for 120 days before performing a four-point bending test.
2：Sample Selection and Data Sources:
Commercial concrete was used with a strength grade of C
3：Beams had the same dimensions and were reinforced similarly. List of Experimental Equipment and Materials:
Displacement sensors, electrical resistance strain gauges, and data acquisition systems were used.
4：Experimental Procedures and Operational Workflow:
Loading process was divided into two stages, controlled by load until reaching 85% ultimate load, then by deflection.
5：Data Analysis Methods:
Based on statistics and fractal theories to analyze crack mechanisms and distributions.
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