In order to solve the problem that it is difficult to determine the fire resistance limit of one-way slab over the sub-way with large size,large load and over-limit,a reduced-scale test method of one-way slabs with equal thickness was proposed based on the deflection deformation equation and the principle of sectional internal force balance of reinforced concrete one-way slabs under fire,and the comparative fire tests were carried out for verification.The results show that during the test process,the temperature fields and mechanical behavior of the full-scale model and the reduced-scale model are consistent.The relative error of fire resistance limit of the two is-4.7％,and the test results of the reduced-scale one-way slab are on the conservative side.The deflection deformation of one-way slabs under fire is close to a sine half-wave function.According to the principle of sectional internal force balance,it is revealed that the temperature of the bottom longitudinal reinforcement is the key factor affecting the fire resistance limit of one-way slabs.The fire resistance test of the reduced-scale one-way slab model can equivalently reflect the fire resistance limit of the full-scale model.The research results can provide an effective test method for evaluating the fire resistance performance and fire inspection acceptance of building slabs over subway.
关键词
地铁上盖/单向板/耐火性能/火灾试验/缩尺试验
Key words
over subway/one-way slab/fire resistance performance/fire test/reduced-scale test
维普
万方数据