火灾后全取代率型钢再生混凝土梁抗弯性能

Studyon Bending Performance Steel Reinforced Recycled Aggregate Concrete Beams With Full Substitution Rate After Fire

为了研究火灾后全取代率型钢再生混凝土(SRRAC)梁的受弯性能,利用有限元模型分析了受火时间、再生粗骨料取代率、钢材及再生混凝土强度参数对构件受弯性能的影响。结果表明:受火时间对构件的抗弯性能影响较为显著,受火时间在30~60 min时混凝土承载力下降幅度在17.9%~29.4%,受火时间在60 min以上时混凝土承载力下降幅度在10%以内;取代率、型钢强度与混凝土强度对承载力影响较小;在受火时间相同而不同取代率的构件内部温度相差不大。

In order to study the flexural performance of recycled steel reinforced concrete(SRRAC)beams with full substitution rate after fire,the finite element model was used to analyze the effects of fire time,recycled coarse aggregate substitution rate,steel and recycled concrete strength parameters on the flexural properties of the components.The results showed that the fire time had a significant effect on the flexural performance of the components,and the concrete bearing capacity decreased by 17.9%~29.4%when the fire time was 30~60 min,and the concrete bearing capacity decreased within 10%when the fire time was more than 60 min.The substitution rate,steel strength and concrete strength had little influence on the bearing capacity.There was little difference in the internal temperature of the components between the same fire time and different substitution rates.