- 摘 要
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（1 上海市建筑科學(xué)研究院 上海市工程結(jié)構(gòu)安全重點實驗室， 上海 200032； 2 東南大學(xué)建筑設(shè)計研究院有限公司， 南京 210096； 3 東南大學(xué)土木工程學(xué)院， 南京 210096）
［摘要］通過4根膠合木柱耐火極限試驗，對四面受火膠合木柱的升溫規(guī)律和耐火極限等進(jìn)行了詳細(xì)研究，主要考慮了截面尺寸對其耐火極限的影響。研究結(jié)果表明：兩個未受火對比試件均在柱中附近折斷；測點離木截面表面距離越近，溫度越高；且不同試件距邊緣相同距離測點溫度隨時間的變化規(guī)律接近；荷載比為0-2的200mm×200mm截面膠合木柱耐火極限為47min，而荷載比為0-2的150mm×150mm截面膠合木柱耐火極限為35min，可見相同荷載比的膠合木柱，截面較小的木柱耐火極限較低。
［關(guān)鍵詞］膠合木柱； 四面受火； 耐火極限； 豎向位移
中圖分類號：TU366-2, TU352-5文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2017)17-0009-05
Experimental study on fire endurance of glulam columns exposed to four-side fire
Chen Lingzhu1, Xu Qingfeng1, Han Chongqing2, Hu Xiaofeng3, Wang Zhengchang3
(1 Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences, Shanghai 200032, China; 2 Architects & Engineers Co., Ltd., Southeast University, Nanjing 210096, China; 3 School of Civil Engineering, Southeast University, Nanjing 210096, China)
Abstract:The temperature development law and fire endurance of glulam columns exposed to four-side fire were carefully studied through fire endurance tests on 4 glulam columns. The effect of cross-section geometry on their fire endurance was considered. Results show that both un-exposed control specimens are snapped close to the mid-span of columns. The closer the thermocouples to the surface of glulam column are, the higher their temperature is. Also, for the thermocouples at different specimens with the same distance to the surface of glulam column, temperature varies similarly with the fire exposure time. The fire endurance of glulam column with the cross-section size of 200mm×200mm under the load ratio of 0-2 is 47min, while the fire endurance of glulam column with the cross-section size of 150mm×150mm under the load ratio of 0-2 is 35min. It shows that for the glulam columns with same load ratio, the column with smaller cross-section size has shorter fire endurance time.
Keywords:glulam column; four side fire; fire endurance; vertical displacement
*上海市科委應(yīng)用技術(shù)開發(fā)項目（2015-110），住房和城鄉(xiāng)建設(shè)部研究開發(fā)項目（2016-K5-017）。
作者簡介：陳玲珠，博士，高級工程師，Email: 20040392chen@163.com。
