| 摘要 |
PROBLEM TO BE SOLVED: To easily evaluate fire resistance efficiency of laminate lumber or fire resistance efficiency of a load bearing part of the laminate lumber.SOLUTION: A load bearing part 52 makes temperature conductivity lower and more hardly increases a temperature, when density of a core material 72 is higher. Thus, a load bearing part 52B made of a core material 72B with higher density more hardly increases the temperature than a load bearing part 52A made of a core material 72A with lower density. |
