The fire performance of glulam beams of high-quality structural materials was examined in this study. Beam specimens of different wood species were subjected to different fire durations and their tension-zone (bottom) fire performance and residual bearing capacity were measured. The charring rate of the Chinese fir glulam beam mixed Douglas fir and larch wood in the tension zone was lower and its residual bearing capacity higher than a pure Chinese fir glulam beam. A set of residual section calculation results was compared with the test values to determine their feasibility in evaluating the fire performance of mixed species glulam beams. The error between the test and calculated values was less than 10%. This research could achieve effective use of low-quality fast-growing wood (Chinese fir) and save costs. In addition, the residual bearing capacity of these beams was increased by 69.1–245.4% compared with Chinese fir glulam beams.

本研究考察了优质结构材料胶合梁的防火性能。不同木材种类的梁试样经受不同的火灾持续时间，并测量了它们的张力区（底部）防火性能和残余承载力。杉木与落叶松木混合梁在受拉区炭化率低于纯杉木梁，残余承载力高于纯杉木梁。将一组剩余截面计算结果与测试值进行比较，以确定它们在评估混合胶合木梁防火性能方面的可行性。测试值与计算值之间的误差小于10%。本研究可实现低品质速生木材（杉木）的有效利用，节约成本。此外，