Experimental Study on Residual Flexural Behavior of Reinforced Concrete Beams after Exposure to Fire
Experimental Study on Residual Flexural Behavior of Reinforced Concrete Beams after Exposure to Fire
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DOI：
10.4028/www.scientific.net/amr.457-458.183
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
Y. Xu;Bo Wu;M. Jiang;Xin Huang
中科院分区：
文献类型：
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作者：
Y. Xu;Bo Wu;M. Jiang;Xin Huang
建筑结构中的钢筋混凝土梁在考虑相邻板翼缘的影响时，通常假定为“T”形梁。然而，对钢筋混凝土T形梁剩余受弯性能的试验研究却很少报道。对两个钢筋混凝土矩形梁和一个钢筋混凝土T形梁在ISO 834标准火灾作用下的剩余弯曲性能进行了试验研究。详细的试验结果，包括温度，抗弯承载力，荷载-挠度曲线和混凝土应变。分析了翼缘对钢筋混凝土梁温度分布和剩余受弯性能的影响。试验结果表明：（1）平截面假设适用于钢筋混凝土“T”形梁。(b)受火2 h后，钢筋混凝土矩形梁的抗弯承载力下降了18.5%，但跨中极限挠度增加了55.1%。(c)火灾后，翼缘的作用使钢筋混凝土矩形梁的剩余抗弯承载力和跨中极限挠度分别提高了8.4%和9.9%。
Reinforced Concrete (RC) beams in the building structures are usually assumed as a ‘T’-shaped beam when the effects of adjacent slab flange are considered. However, experimental studies on residual flexural behavior of ‘T’-shaped RC beams are rarely reported. The residual flexural behavior of two RC rectangular beams and one RC ‘T’-shaped beam after exposure to ISO834 standard fire were experimentally investigated in the paper. The detailed experimental results, including the measured temperatures, flexural capacity, load-deflection curves and concrete strain are presented. The effects of flange on temperature distribution and residual flexural behavior of RC beams were analyzed. The experimental results show that: (a) the assumption of plane section is applicable for RC ‘T’-shaped beam. (b) The flexural capacity of RC rectangular beam was decreased 18.5% after exposure to fire for 2 hours, but the ultimate mid-span deflection was increased 55.1%. (c) The residual flexural capacity and the ultimate mid-span deflection of RC rectangular beam after fire was respectively increased 8.4% and 9.9% due to the effect of flange.