Research On Dynamic Combustion And Charring Behaviors Of Glubam

With the negative environmental issues have become increasingly prominent, energy conservation and emissions reduction and sustainable development have become one of the focus of the governments' work around the world. Bamboo as a kind of green renewable and environmental friendly material, there are a wide variety of bamboo species and rich production in China, and the Glubam which is manufactured by bamboo has good wokability and mechanical properities. At the same time, the buildings built with Glubam have the advantages of fast construction speed, excellent seismic performance and low cost, they have been applied in engineering practice at present. However, Glubam as the basic material of modern bamboo structures, it is a kind of combustible material, the fire-resistant performance has received the widespread attention and questioning, which hindered seriously the development of modern bamboo structures, so in order to promote the engineering application of Glubam and the development of modern bamboo structures, the dynamic combustion performance, the charring characteristics and heat transfer performance was studied in this paper. As well, the temperature field was simulated and analyzed by using the finite element analysis software-ABAQUS. The main research work and results include the following aspects:(1) Experimental study conducted on the dynamic combustion performance of Glubam under different heat radiation intensities by using Cone Calorimeter. The combustion parameters of ignition time, heat release rate, mass loss rate, smoke production rate, CO2 and CO yield under different heat fluxes were obtained, and the comparisons with plywood were made. Also, by using the experimental results, the fire risks of Glubam were evaluated from ignitability, fire heat hazard and fire smoke hazard, and a simple prediction of the fire flashover time and the fire-resistance time was made. The results show that: Glubam has higher fire heat danger in the early stages of fire and the fire heat danger is reduced with the development of fire,,its fire development speed is lower than plywood, but the fire smoke danger of Glubam is much higher than plywood;(2) In accordance with constant temperature and ISO standard temperature heating regimes, experimental study conducted on Glubam exposed to one-side fire. The charring rates under different fire conditions and temperatures at different locations were measured and the general charring rule was obtained. The charring rate of Glubam under ISO standard fire condition is 0.64mm/min. By analyzing the temperature field data, the fire insulation performance of Glubam is better than cedarwood.(3) Based on the similarity on chemical composition and microstructure of bamboo and wood, temperature field of Glubam was simulated using ABAQUS by referring to the thermal parameters of wood, and the comparison of simulated results with experimental results for Glubam exposed to one-side fire was conducted to obtain the applicability of the thermal parameters of wood for Glubam. The results show that: before the formation of the charring layer, the finite element results are in good agreement with the test results, but differences occur after the charring layer formation. The thermal performance of Glubam still needs further studies.