建筑结构学报2024，Vol.45Issue(3)：70-80,11.DOI:10.14006/j.jzjgxb.2023.0380
基于复杂热解模型的CLT房间火灾温度场数值模拟及iBMB参数化火灾升温曲线修正
Numerical simulation of fire temperature field in CLT compartment based on complex pyrolysis model and revision of iBMB parametric fire curve
摘要
Abstract
To explore the impact of the inherent combustibility of cross laminated timber(CLT)on the fire temperature field within CLT compartments,a comprehensive approach combining numerical simulations and theoretical analysis was employed in this study.Firstly,a refined solid modeling of CLT components and the moveable fuel load(wood cribs)was carried out using a complex pyrolysis model in the FDS(fire dynamics simulator)software,establishing a CLT compartment fire test model.The results indicated that the complex pyrolysis model could reasonably reflect the pre-decay temperature development trends in the CLT compartment fires.It accurately predicted critical parameters such as the ignition temperature,peak temperature,and fully developed fire duration,with errors falling within the range of-3.4％to-27.8％,-1.1％to-12.5％,and 0.3％to 34.0％,respectively,when compared to existing experimental data.Secondly,as a progression from the preceding research,the moveable fuel load was simplified to a custom heat release rate burner based on the iBMB parameterized fire curve.This simplified modeling approach in FDS enhanced computational efficiency and generated temperature-time curves that closely aligned with experimental results during the fire growth and fully developed stages.However,it tended to overestimate the fully developed fire duration,extending it by 15 to 20 minutes.Finally,by considering the combustibility of wood,adjustments were made to the iBMB parameterized fire curve,involving modifications to fire load density and peak heat release rate.This led to the development of a hand-calculation model suitable for modeling the temperature-time curve in ventilated control-type CLT compartment fires.The calculated results closely matched experimental values,with errors in peak temperature remaining within 10％.In comparison to parameterized fire curves by other researchers considering wood combustibility,the modified iBMB parameterized fire curve hand-calculation model demonstrated superior accuracy in predicting fire growth time and temperature development during the fire decay phase.关键词
正交胶合木/复杂热解模型/FDS模拟/iBMB参数化火灾升温曲线Key words
cross laminated timber/complex pyrolysis model/FDS simulation/iBMB parametric fire curve分类
建筑与水利引用本文复制引用
聂玉晗,张晋,姜坤,邢智岩..基于复杂热解模型的CLT房间火灾温度场数值模拟及iBMB参数化火灾升温曲线修正[J].建筑结构学报,2024,45(3):70-80,11.基金项目
国家自然科学基金项目(51778143). （51778143）
