Study on coupling effect of fire and explosion on mechanical properties of RC slab
To study the anti-explosion performance of reinforced concrete(RC)slab under fire,ABAQUS finite element software was used to simulate existing test and verify the of validity of high-temperature model under fire and the normal temperature explosion model of RC slab.Based on this,the explosion mechanism of RC slab under fire was analyzed,then the effects of fire time,different azimuth angles,and different explosion positions on the anti-explosion performance of RC slab under fire were studied.The results show that when an RC slab under fire is subjected to explosive load,shear failure occurs in the middle of the slab firstly,and then flexural failure occurs in the whole slab.With the increase of fire duration,the concrete will deteriorate under high temperature and the strength of reinforcement will decline,and the explosion resistance of RC slab will decline seriously.Under the working condition of 120 min under fire,the peak displacement of slab corner explosion increases by 134.4%and 150.9%compared with that of slab edge and slab middle explosion.Under the working condition of 180 min under fire,the peak displacement of slab corner explosion increases by 138.4%and 159.9%compared with that of slab edge and slab middle explosion.The explosion at different positions has an obvious impact on RC slab,among which the explosion in the slab has the highest damage degree to RC slabs,and the more serious the damage of the RC plate is,the longer the dynamic response duration is.Under the working condition of 120 min under fire,the peak displacement of RC slab under the condition of 60°and 90°explosion azimuth angle decreases by 4.4%and 2.4%respectively compared with that of 30° explosion azimuth angle.The impact of the explosion at different azimuth angles on the RC slab is not obvious.
NETL
NSTL
万方数据
