- 摘 要
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（1 東南大學土木工程學院， 南京 210096； 2 上海市建筑科學研究院 上海市工程結(jié)構(gòu)安全重點實驗室， 上海 200032； 3 東南大學建筑設計研究院有限公司， 南京 210096）
［摘要］一麻五灰是傳統(tǒng)木結(jié)構(gòu)中常見的地仗保護做法。通過4組10根采用一麻五灰傳統(tǒng)保護處理圓木柱的耐火極限對比試驗，研究不同持荷水平、不同直徑、是否采用一麻五灰傳統(tǒng)保護處理等對圓木柱耐火極限的影響。研究結(jié)果表明：對于直徑為200mm的圓木柱，當無表面防火處理時，荷載比為30%和50%時耐火極限分別為39-7min和8-7min；當表面采用一麻五灰傳統(tǒng)保護處理時，荷載比為30%和50%時耐火極限分別為56-0min和19-9min；對于直徑為350mm的圓木柱，當無表面防火處理時，荷載比為30%和50%時耐火極限分別為94-2min和62-5min；當表面采用一麻五灰傳統(tǒng)保護處理時，荷載比為30%和50%時耐火極限分別為123-7min和94-7min?？梢妶A木柱的耐火極限隨著持荷水平增加而顯著降低，隨著直徑增加而顯著增大；采用一麻五灰傳統(tǒng)保護處理后，圓木柱的耐火極限明顯增大；一麻五灰傳統(tǒng)保護處理能有效降低圓木柱內(nèi)部的溫升梯度，延緩圓木柱開始炭化的時間、降低炭化速度。
［關鍵詞］傳統(tǒng)木結(jié)構(gòu)； 圓木柱； 耐火極限； 一麻五灰； 炭化速度
中圖分類號：TU372-5， TU366文獻標識碼：A文章編號：1002-848X(2017)17-0014-06
Experimental study on fire endurance of round timber column with traditional craftwork with one hemp fiber and five plastering application
Wang Zhengchang1, Xu Qingfeng2, Han Chongqing3, Chen Lingzhu2, Hu Xiaofeng1
(1 School of Civil Engineering, Southeast University, Nanjing 210096, China; 2 Shanghai Key Laboratory of Engineering Structure Safety, SRIBS, Shanghai 200032, China; 3 Architects & Engineers Co., Ltd, Southeast University, Nanjing 210096, China)
Abstract:Craftwork with one hemp fiber and five plastering application is one of the most common methods of plaster protection in Chinese traditional timber buildings. Fire endurance comparison tests were conducted on 4 groups of 10 specimens of the round timber columns which were protected by craftwork with one hemp fiber and five plastering application, and the influence of factors such as load level, diameter and craftwork with one hemp fiber and five plastering application were studied on fire endurance of the round timber column. Study results show that for the round timber columns with the diameter of 200mm, if there is no fire protection applied on their surfaces, their fire endurance are 39-7min and 8-7min respectively under the load level of 30% and 50%. If craftwork with one hemp fiber and five plastering application is employed on surfaces, their fire endurance are 56-0min and 199min respectively under the load level of 30% and 50%. For the round timber columns with the diameter of 350mm, if there is no fire protection applied on their surfaces, their fire endurance are 94-2min and 62-5min respectively under the load level of 30% and 50%. If craftwork with one hemp fiber and five plastering application is employed on surfaces, their fire endurance are 123-7min and 94-7min respectively under the load level of 30% and 50%. It shows that the fire endurance of round timber columns decreases greatly with the increasing of load level, and increases remarkably with the increasing of the column diameter. If craftwork with traditional one hemp fiber and five plastering application is employed, fire endurance of round timber column obviously increases. Craftwork with traditional one hemp fiber and five plastering application effectively decreases the temperature gradient inside the round timber columns, delays the beginning time of charring and reduces the charring rate.
Keywords:traditional timber structure; round timber column; fire endurance; craftwork with one hemp fiber and five plastering application; charring rate
*上海市青年科技啟明星計劃項目（17QB1403400），上海市優(yōu)秀技術帶頭人項目（15XD1522600）。
通訊作者：許清風，博士，教授級高工，Email：xuqingfeng73@163.com。
