无机胶复合竹梁耐火性能试验研究及数值分析

Experimental Study and Numerical Analysis on Fire Resistance of Inorganic-Bonded Bamboo Composite Beam

摘要:

为了研究无机胶复合竹梁的耐火性能，对2根足尺无机胶复合竹梁开展了标准火灾试验。结果表明：无机胶的耐高温特性能有效延缓复合竹梁表面炭化向内发展，标准火灾下复合竹梁表面炭化均匀；当持荷比为0.3和0.4时，复合竹梁的平均炭化速率分别约为0.35、0.38 mm/min，且耐火极限均大于2.0 h。所建立的热-力耦合有限元模型能够有效模拟无机胶复合竹梁的耐火性能，复合竹梁的耐火极限与持荷比呈负幂指数关系，与跨高比线性负相关，与截面高度线性正相关。

Abstract:

To investigate the fire resistance performance of inorganic-banded bamboo composite （InorgBam） beams， standard fire tests were conducted on two full-scale InorgBam beams. The results show that the high-temperature resistance characteristics of the inorganic adhesive effectively delay the inward development of surface charring in the InorgBam beams. Under standard fire exposure， the surface charring of the InorgBam beams is uniform. At load ratios of 0.3 and 0.4， the average charring rates of the InorgBam beams are approximately 0.35 and 0.38 mm/min， respectively， with fire resistance limits exceeding 2.0 hours in both cases. The established thermo-mechanical coupled finite element model effectively simulates the fire resistance performance of the InorgBam beams. The fire resistance limit of the InorgBam beams exhibits a negative power-exponential relationship with the load ratio， a linear negative correlation with the span-to-depth ratio， and a linear positive correlation with the section height.