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研究木柱火灾后的耐火极限,运用通用有限元软件Ansys,采用热-结构间接耦合法对木柱进行温度场和耐火极限分析,并将分析结果与试验值比较,进而对木柱的耐火极限进行参数分析。结果表明,随着温度的升高,木柱表层和里层温度都有不同程度的上升,离木柱表面越近的点升温速度越快,最终温度越高。木柱随着木材密度的增加,耐火极限上升,但上升的幅度越来越小;随着持荷水平的增加,耐火极限不断下降,而且下降的越来越快。
Studied the fire resistance limit after wood fire, the general finite element software Ansys was used to analyze the temperature field and fire resistance limit of the wood column by using thermo-structure indirect coupling method, and the results were compared with the experimental values, and then the fire resistance limit Parameter analysis. The results showed that with the increase of temperature, the temperature of the surface layer and the inner layer of wood column increased to some extent, and the temperature near the surface of wood column increased faster and the final temperature was higher. With the increase of wood density, the fire-resistant limit increased, but the rising amplitude was getting smaller and smaller. With the increase of the load-bearing level, the fire-resistant limit decreased continuously and declined faster and faster.