正交胶合木墙板火灾炭化试验研究

采用耐火试验炉，开展了正交胶合木墙板试件在标准火灾条件下的炭化试验，研究正交胶合木墙板内部不同深度处的温度变化曲线、炭化深度和炭化速率等变化规律，分析不同胶粘剂对层板脱落和炭化速率的影响，对比层板脱落或不脱落情况下炭化深度的计算方法。结果表明，对于采用普通PUR 胶的试件，第一层层板50～60 min 时发生脱落，脱落后试件的炭化速率明显变大；采用耐热型PUR 胶的试件，未出现明显的层板脱落现象，炭化速率恒定，与欧洲标准中的普通木结构的名义炭化速率0.65 mm/min 相当。

Experimental study on charring of crossliaminated timber exposed to standard fire#br#

Experimental tests have been carried out to study the charring of cross- laminated timber （CLT）wall panels under standard fire exposure, by using a fire- resistance furnace. The temperature curves at different depths within the CLT panels,charring depths and charring rates are examined. The effect of different adhesives on delamination and charring rate are studied.Methods of calculating the charring depth of CLT with or without delamination occurrence are also presented and discussed.The results show that the CLT panels manufactured using normal PUR adhesive had the first layer fall-off at about 50~ 60 min, and the charring rate increased considerably after falloff of the first layer. However, the CLT panel smanufactured using heat- resist PUR adhesive exhibit no obvious delamination,and the charring rates remained constant during tests, which are consistent（0.65 mm/min）with the design value of normal timber structures as given in Eurocode 5.