正交胶合木楼板炭化速度有限元分析

Finite Element Analysis of the Charring Rate of Cross-Laminated Timber Floor

为研究正交胶合木(CLT)楼板炭化速度有限元分析方法,在ISO834标准升温条件下进行了3组国产CLT楼板的火灾试验。对胶黏层的拉伸与剪切试验进行有限元模拟,建立了2种CLT楼板炭化速度有限元模型,即未考虑层板脱落和考虑层板脱落的有限元模型。将试验得到的温度-时间曲线、炭化深度(速度)曲线与有限元模型的模拟结果进行对比。研究结果表明,受火时间越长,炭化速度越大;采用胶黏单元来模拟CLT板中的胶黏剂是可行的;考虑层板脱落的炭化速度有限元模拟结果与试验得到的炭化速度结果吻合较好。

In order to study the finite element analysis method of charring rate of cross-laminated timber(CLT)floor,three groups of domestic CLT floor fire experiments were conducted under ISO834 standard temperature rising conditions.Tensile and shear tests of the adhesive layer were simulated by using the finite element method,and two kinds of finite element models of charring rate of CLT floor were established:the finite element model without considering the delamination of the laminate and that considering the delamination of the laminate.The temperature-time curve and charring depth(rate)curve obtained from the test data were compared with the simulation results of the finite element model.The results show that the longer the fire time is,the higher the charring rate is.Besides,it is feasible to simulate the adhesive in the CLT plate by using cohesive element.Moreover,the finite element simulation results of the carbonization rate considering the delamination of the laminates agree well with the results of the carbonization rate obtained by the test.