Abstract: In order to clarify the influence of combustible bed structure characteristics on combustibility evaluation, taking 7 species in the south China as an example, under the three combustible bed structures, direct evaluation method and principal component comprehensive evaluation method were used to evaluate the results of cone calorimeter, the peak heat release rate and the average effective heat content. The results showed that the correlation between the PHRR and AEHC of the 7 species became worse due to the bed structure. And it has a greater impact on the direct evaluation method of combustibility of combustibles using PHRR and AEHC; the main component comprehensive evaluation method under different combustible bed structures has obvious influence, and the rank correlation is poor under the three structure conditions. It shows that based on the results of a cone calorimeter with a bed structure, the use of the principal component comprehensive evaluation method to evaluate the combustibility of combustibles needs to be further studied.

Key words: cone calorimeter, combustibility, evaluation of influence