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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Civil and Traffic Engineering     
Experiments on fire-resistance performance of fire-resistant steel-concrete composite beams
JIANG Xiang, TONG Gen shu, ZHANG Lei
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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Abstract  

Fire resistance tests were carried out on 2 fire-resistant steel-concrete composite beams (FRSCCB)with different thicknesses of fire fireproof coating, and 1 conventional structural steel-concrete composite beam(CSSCCB) under the same conditions as a control group. The furnace temperature, the temperature distribution along the composite beam sections and the mid-span deflection were measured. The test results show that the simply supported FRSCCB reaches its fire limit state when the mid-span deflection reaches 1/30 of the span. The fire-resistance time of the first set FRSCCB with 15 mm fireproof coating is 93 min and exceeds the fire-resistance time of CSSCCB which is 64 min more than 45.3%.The fire-resistance time of the FRSCCB with 25 mm fireproof coating is 132 min, which surpasses the Grade 1 beam fire-resistance requirement according to Chinese code GB50016: 2014. In conclusion, the fireresistant steel can be used to improve the fire resistance performance of steel-concrete composite beams and to decrease the thickness of fire proof coating.

Published: 01 August 2016
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JIANG Xiang, TONG Gen shu, ZHANG Lei. Experiments on fire-resistance performance of fire-resistant steel-concrete composite beams. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(8): 1463-1470.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.08.006     OR     http://www.zjujournals.com/eng/Y2016/V50/I8/1463


耐火钢-混凝土组合梁抗火性能试验

进行2个防火涂料厚度不同的耐火钢-混凝土组合梁试件，以及1个同等条件下的普通钢-混凝土组合梁试件作为对照组的抗火试验.测量炉温、组合梁沿截面高度不同测点的温度、组合梁跨中竖向挠度.试验结果表明：可取跨中挠度达到梁跨的1/30作为简支耐火钢-混凝土组合梁达到耐火极限状态的界限.防火涂料厚度为15 mm的耐火钢-混凝土组合梁耐火极限时间为93 min，比相同条件下的普通钢-混凝土组合梁耐火极限时间64 min提高了45.3%；当防火涂料厚度为25 mm时，耐火钢-混凝土组合梁的耐火极限时间为132 min，超过中国规范（GB50016：2014）中梁一级防火的要求.在一定的火灾和荷载等条件下，采用相同强度等级耐火钢的钢-混凝土组合梁具有更好的抗火性能，可减小建筑物的防火涂层厚度.

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