Experimental Study On Fire Resistance Of Typical Wooden Structural Components Of Ancient Buildings

The timber ancient buildings on stilts not only carry the construction technology passed down from generation to generation in our country,but also the carrier of our national history,culture and art.In the fire process of the ancient building of the stilt building,the wooden floor and the partition wall plank will burn through first,causing the fire to spread throughout the building,and the wooden beam will lose the bearing capacity after the surface is carbonized and cause the building to collapse.Therefore,this article will focus on the fire resistance of wooden beams,wooden floor slabs and partition wall planks under fire conditions.Starting from the fire test of the timber ancient buildings on stilts components of wooden stilts,this paper conducts a study on the combustion characteristics and fire resistance of wooden beams,wooden floor slabs and partition wall planks in ancient buildings of stilts building under the action of a pool fire source.Research on the burning characteristics under the action of light source,in order to obtain the fire resistance performance of ancient building components under the action of different fire sources.The main research contents and conclusions of this paper are as follows:(1)The maximum carbonization rate of the wood beam test samples under the action of the pool fire source is 0.8mm/min.As the fire time increases,the wood beam carbonization rate decreases.(2)Under the action of pool fire,the larger the fire source,the faster the carbonization rate of test samples with the same cross-section thickness.Under the same pool fire source,the greater the thickness of the sample cross-section,the lower the carbonization rate.(3)The maximum carbonization rate of the wood floor sample with a cross-section thickness of 20 mm under the action of a 250 mm oil pan fire source is1.538mm/min,and the maximum carbonization rate of the 20 mm partition wall wood sample under the action of a 150 mm oil pan fire source is 0.435 mm/min,the maximum average carbonization speed of the partition wall wood sample with a section thickness of 15 mm under the action of a methane Bunsen burner fire source is1.25mm/min.(4)The wooden floor slab and the partition wall plank both appear flashover under the action of the fire source of the pool fire.The wood will be thermally decomposed during the pyrolysis process to produce a large amount of combustible volatiles,which will burn violently after being ignited by the fire source.(5)The methane Bunsen burner is a small fire source.During the combustion process,the burning area of ??the fire surface is small,but due to the high flame temperature,the test sample burns through for a short time;the pool fire source has a large diameter,and during the combustion process,The fire surface of the test sample is ignited in a large area and flashover occurs.The burn-through time of the test sample is longer than that of the methane Bunsen burner.