Experimental Research on Load-Bearing Capacity of Fire-Damaged Reinforced Concrete Continuous T-Beams
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摘要: 为探讨受火冷却作用对混凝土连续梁承载力的影响,对3根钢筋混凝土连续T形梁的承载力进行了试 验研究,并用有限元法对试验结果进行了参数分析,提出了受火冷却后钢筋混凝土连续梁极限荷载的简化计算 方法.结果表明:受火冷却后,钢筋混凝土连续T形梁的跨中屈服荷载、极限荷载和刚度均下降,承载力降幅明显 低于刚度降幅;在受火120min内,配筋率对受火冷却后钢筋混凝土连续T形梁的承载力有显著影响,而受火时 间和混凝土强度的影响有限;按照简化计算方法计算的钢筋混凝土连续T形梁的极限荷载与试验值吻合较好.Abstract: In order to research the effects of heating and cooling on the load-bearing capacity of fire-damaged reinforced concrete (RC) continuous beams, loading tests of three RC continuous T-beams were conducted. A parametric analysis for the load-bearing capacity of fire-damaged RC continuous beams were carried out with the finite element method. A simplified method for evaluating the ultimate load of RC continuous beams after fire was presented. The research results show that a fire-damaged RC continuous T-beam exhibits a low midspan yield load, ultimate load and stiffness compared with a control T-beam, and the decrease of stiffness is greater than that of the load-bearing capacity. Within heating time of 120 min, ratio of reinforcement has a significant effect on the load-bearing capacity of a fire-damaged RC continuous T-beams, while heating time and concrete strength have a finite influence. The simplified method is capable of predicting the ultimate load of fire-damaged continuous RC beams exactly.
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