(1 上海市工程结构新技术重点实验室，上海 200032； 2 上海市建筑科学研究院，上海 200032； 3 东南大学，南京 210096)

［摘要］通过6根四面受火木柱耐火极限的对比试验，研究不同持荷水平、是否采用石灰膏抹面对木柱耐火极限的影响。研究结果表明，四面受火木柱耐火极限随着荷载水平的增加而明显降低。采用石灰膏抹面后，其耐火极限有所增加。石灰膏抹面能有效降低四面受火木柱内的温升梯度，延缓木柱开始炭化的时间，降低炭化速度。

［关键词］木柱；四面受火；石灰膏抹面；耐火极限

Experimental research on fire endurance of timber columns exposed to four-side fire

Li Xiangmin^1,2, Li Shuaixi³, Xu Qingfeng^1,2, Xu Qiang², Zhang Jin³, Mu Baogang³(1 Shanghai Key Laboratory of New Technology Research on Engineering Structure, Shanghai 200032, China; 2 Shanghai Research Institute of Building Sciences, Shanghai 200032, China; 3 Southeast University, Nanjing 210096, China)

Abstract:To learn the effective factors such as load level and lime putty finishing, six timber columns were tested. It was found that the fire endurance of timber column exposed to four-side fire obvious decreases when the load level increases. The fire endurance will extend after lime putty finishing is used. The lime putty finishing will obviously drop the increase gradient of temperature inside the timber column, effectively delay the beginning time of charring and reduce the charring rate.

Keywords:timber column; exposed to four-side fire; lime putty finishing; fire endurance

*上海市科委青年科技启明星计划(07QB14031)和国家科技支撑计划(2006BAJ03A10 02)。

作者简介：李向民，博士，高级工程师，Email:lxm-sh@tom.com。

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