木材老化对古建筑木梁抗弯性能的影响分析  

Analysis on influence of wood aging on flexural behavior of wooden beam in ancient building

作　　者：薛建阳[1,2] 宋德军 路鹏[1] 吴晨伟 何圳 XUE Jianyang;SONG Dejun;LU Peng;WU Chenwei;HE Zhen(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《建筑结构》2024年第19期66-73,共8页Building Structure

基　　金：国家自然科学基金面上项目(52278317)。

摘　　要：为研究木材老化对古建筑木梁抗弯性能的影响,分析了木材的老化机理,采用等效截面法并结合国内木梁老化深度经验公式,提出了老化木梁抗弯承载力退化模型,并对某古建筑的木梁进行了承载力退化评估。对未老化与老化木梁进行了单调加载数值模拟,并通过试验验证了模型的合理性;在此基础上,进一步分析了老化均匀度与老化深度对木梁抗弯性能的影响。结合《木结构设计标准》(GB 50005—2017)中受弯构件的承载力计算公式,提出了考虑老化影响的木梁抗弯承载力折减系数计算公式。结果表明:老化对木梁抗弯承载力的影响与老化均匀度呈线性相关,与老化深度呈一元二次多项式关系。老化深度越深且老化均匀度越大,木梁承载力越低。To study the influence of wood aging on the flexural behavior of wooden beam in ancient building,the aging mechanism of wood was analyzed.Based on the equivalent section method and empirical formula of aging depth of wooden beam in China,the bending bearing capacity degradation model of aging wooden beam was put forward,and the bearing capacity degradation evaluation of a wooden beam of an ancient building was carried out.Monotonic loading numerical simulations were conducted on both non-aged and aged wooden beam,and the rationality of the model was verified by the test.On this basis,the effects of aging uniformity and aging depth on the flexural behavior of wooden beam were further analyzed.Combined with the calculation formula of bearing capacity of flexural members in Standard for design of timber structures(GB 50005-2017),a calculation formula for the reduction coefficient of the bending bearing capacity of wooden beam considering the influence of aging was proposed.The results show that the influence of aging on the bending bearing capacity of wooden beam is linearly related to the aging uniformity,and has a univariate quadratic polynomial relationship with the aging depth.The deeper the aging depth and the greater the aging uniformity,the lower the bearing capacity of the wooden beam.

关 键 词：古建筑木结构 木梁老化 抗弯性能 承载力退化模型 承载力折减系数 

分 类 号：TU366.2[建筑科学—结构工程]