混凝土组合构件耐火性能试验研究

利用自行设计的火灾燃烧炉对混凝土T型组合构件的耐火性能进行试验研究。试验持续120 min，观察火灾后构件表观现象并测量火灾过程中组合构件内部温度变化，得到火灾下混凝土板、墙组合构件的内部温度场分布规律及其高温损伤情况。结果表明：火灾下组合构件墙体受火面位置处更容易出现混凝土剥落现象，应在该位置处采取施作防火涂料等防火措施来减轻火灾高温的影响；组合构件节点核心区的混凝土温度低于其他受火区域的温度，墙板对节点核心区有一定的保护作用；火灾作用下距离混凝土组合构件受火表面越远，其内部温度越低，且其温度开始上升的反应时间越长；组合构件在非受火区域温度整体较低，温度升高的反应时间较长且速度较慢，火灾高温对非受火区域的结构影响较小。

Experimental study on fire resistance of concrete composite member

The fire resistance of T shape concrete members was studied by using a self-designed combustion furnace.By observing the apparent phenomenon of the component after fire and measuring the internal temperature changes of the composite member during the fire of 120 min,the distribution rule of internal temperature and high temperature damage of concrete under fire,which is composite member composed of concrete walls and slabs,were obtained.The results showed that the concrete spalling phenomenon is more likely to occur at the exposed fire side of the concrete wall under fire,and the fire protection measures such as fire-retardant coating should be taken at this position to reduce the impact of high temperature of the fire.The concrete temperature in the joint core area of the composite member is generally lower than that in other heated areas,and the wall and slab have a certain protective effect on the joint core area.The farther away from the fire-heated surface,the lower the internal temperature of the concrete composite member under fire,and the longer the reaction time till the temperature begins to rise.The temperature of the composite member is lower in the non-heated area,the reaction time of the temperature rise is longer and the speed is slower,and the high temperature has less influence on the structure of the non-heated area.