【摘要】 针对一般环境下的木构件,提出了同时考虑承载力和变形要求的虫蛀木构件的寿命预测模型,该模型包括2个阶段,即由木结构建成到白蚁进入结构前的初始阶段和白蚁开始攻击结构到引起结构破坏的发展阶段。在分析木材虫蛀随机模型的基础上,确定了寿命预测模型中初始期的计算方法;并以构件截面承载力达到极限状态为失效标准,依据可靠度理论确定了发展期的计算方法。最后通过算例验证了该方法的可行性。更多还原

【Abstract】 A performance-based model for service life prediction of structural wood in an atmospheric environment is presented which considered both the bearing capacity and the deformation.In this model,the life cycle of in-service timber structures consists of two stages,that is,the preliminary period from the year the house is constructed to the year the termite began to attack it,and the development period from the year the termite began attacking the target timber structures to the year it was damaged because of termite attack.Based on a probabilistic model for termite attack on housing,the calculation method of prediction for the preliminary period is proposed;the calculation method of the development period is also presented based on the reliability theory and timber member’s ultimate bearing capacity.Finally an example is analyzed to verify the proposed method.更多还原