火灾下玻化微珠保温混凝土梁的抗弯承载力的分析与计算

The Analysis and Calculation on Bearing Capacity of Glazed Hollow Bead Insulation Concrete Bending Beam under Fire

为了对玻化微珠保温混凝土受弯梁构件在火灾下的安全性能进行评估提供有效的分析手段,采用有限元分析方法,对不同受火时间下玻化微珠保温混凝土受弯梁截面温度场的分布与高温下的力学性能进行分析,结合玻化微珠保温混凝土在不同受火温度下的抗压强度试验研究结果,提出了火灾下混凝土受弯梁的承载力估算方法,并与同参数的普通混凝土受弯梁进行对比。结果表明,在火灾下不同时刻,玻化微珠保温混凝土梁体的温度场分布随时间的变化幅度更小,梁体温度上升更加缓慢;在相同受火条件下,玻化微珠保温混凝土梁的残余抗弯承载力远远高于普通混凝土梁。

This study aims to establish an effective analysis way to evaluate the safety per‐formance of glazed hollow bead insulation concrete bending beam under fire .Using the finite ele‐ment analysis method ,this paper analyzed temperature field distribution in section under different time by fire and mechanical performance under high temperature of glazed hollow bead insulation concrete bending beam .Combining with the compression strength test results of glazed hollow bead insulation concrete under different fire temperature ,this paper proposed the method for esti‐mating the bearing capacity of concrete bending beams under fire ,and compared the result with that of normal concrete bending beams with the same parameters .Results show that with differ‐ent fire time ,the change range of temperature field distribution in glazed hollow bead insulation concrete beam is smaller ,and the beam body temperature rises more slowly .In the same condi‐tion by fire ,the residual bearing capacity of glazed hollow bead insulation concrete bending beam is much higher than that of normal concrete bending beam .T he research results in this paper can provide relevant reference to the related engineering application of glazed hollow bead insulation concrete .