非加载情况下正交胶合木楼板耐火性能试验研究

Experimental study on fire⁃resistance performance of cross⁃laminated timber floor under non⁃load bearing conditions

采用耐火试验炉和标准升温曲线,开展正交胶合木(Cross-laminated timber,简称CLT)楼板在非加载情况下的耐火性能试验,测试的试件为5层CLT楼板,层板厚度为35 mm,整体厚度为175 mm。通过耐火试验获取了CLT楼板内部不同深度处的温度、炭化速率和炭化深度等变化规律,分析了不同类型胶黏剂对层板脱落和炭化速率的影响。试验结果表明,所测试楼板试件的耐火隔热性和完整性均不低于2.00 h。试验发现,采用普通PUR(聚氨酯)胶的试件,第一层层板在58~69 min时发生脱落,第二层层板在100~113 min时发生脱落,炭化速率高于欧洲标准推荐的炭化速率。相比之下,采用耐热型PUR胶的试件未出现明显的层板脱落现象,炭化速率相对稳定。

Experiments were carried out to study the fire resistance performance of cross laminated timber(CLT)floor under non⁃loading conditions,by using a fire⁃resistance furnace and the standard fire curve.The tested specimens consisted of 5 layers of CLT laminates,with a thickness of 35 mm for each layer and an overall thickness of 175 mm.The temperature profiles at different depths within the CLT specimens,charring depths and charring rates were obtained in the tests.The effect of different types of adhesives on delamination and charring rate were also studied and analyzed.The test results show that the fire insulation and integrity of the tested floor specimens were not less than 2.00 h.For specimens using ordinary PUR adhesive,the first layer delaminated at about 58~69 minutes,and the second layer delaminated at about 110~113 minutes.The charring rates of the specimens were higher than the nominal charring rate given in Eurocode 5.For the specimen using heat resistant PUR adhesive,there was no obvious layer delamination being observed.The charting rate remained respectively constant.