参数火灾下木柱损伤量化评估研究OA

To accurately assess the damage extent of timber structures under real fire conditions,this paper proposes an energy-based time equivalent method(referred to as the"energy equivalence method").The study conducted fire exposure tests on six glued laminated timber column specimens,subjecting them to both EN 1991-1-2 parameter fires and their equivalent standard fires to validate the applicability and accuracy of this method.Results indicate that for timber columns with identical structural composition,when absorbing equiva-lent heat under parametric and standard fire conditions,significant equivalence is observed in char morphol-ogy,residual cross-sectional shape,charring depth,temperature distribution of the pyrolysis layer,and re-sidual load-bearing capacity post-fire.Specific data indicate that the relative errors in charring depth,ultimate load-bearing capacity,and ultimate displacement are controlled within 10%,5%,and 10%,respectively.This confirms that the energy equivalence method can effectively evaluate the damage extent of timber struc-tural members under parameterized fires,providing theoretical basis and practical support for advancing performance-based fire safety design in timber structures.