Theoretical Research On The Mechanical Properties Of Wood Structure After Combustion

Since ancient times,builders have made use of all kinds of wood a s building materials in civil engineering.Even after thousands of years of history,the wooden structure still did not withdraw from the stage of history.In September 2015 the Ministry of industry and the Ministry of housing jointly issued a "green build ing materials production and application of action plan",vigorously promote the wood structure.However,due to the inherent characteristics of wood structure fire resistance is weak,often cause a fire,to the people's lives inconvenience,at the same ti me,also produced a huge economic losses and casualties.In our country,the research on wood structure has accumulated some achievements.However,the research on fire prevention,waterproof and moisture proof is still lacking in china.This paper selects three kinds of common wood(Populus simonii,Douglas fir and larch),full-scale sufficient experiments,using international standard fire curve,was surrounded by the fire burning test for three different kinds of wood,the use of armored thermocouple temperature measurement of critical carbonization depth,temperature curve drawing.After the experiment,the wood was subjected to the standard mechanical experiment to measure the residual bearing capacity of wood.According to the purpose of the experiment,this paper reviewed the research on domestic and international wood combustion performance and mechanical performance,combined with the test standard of our country,conduct experiments,experimental study on the performance of the remaining force bearing after burning burning wood.Before the experiment,the thermal parameters and mechanical parameters will be determined according to the standard.China's current "combustion test reference fire resistance test method"(GB/T 99781-2008),the test curve by building component parts international standard organization,namely the standard curve(ISO834),60 minutes of combustion test.The bearing capacity of experimental reference "test method of wooden structure after the burning of the remaining standard"(GBT50329-2012)regulations,chapter fifth(bend test beams)and chapter sixth(axial compression experiment)experiment method.Through the experimental study of Populus simonii,Douglas fir and larch wood three,obtained 60 minutes critical temperature c urve of charring layer.Using finite element analysis software ABAQUS to simulate a wooden structure of the roof engineering.Analyses the three kinds of wood burning in 60 minutes,and still meet the "failure" test method of fire resistance under the cond ition of critical section size timber size.