摘要
既有结构当前的材料强度是客观上完全确定但具有主观不确定性的未确知量。目前的区间估计法为概率推断方法,并不完全适用于对既有结构当前现实的材料强度的推断。该文针对既有结构的特点,分析了目前区间估计法的缺陷,提出了既有结构当前材料强度的信度推断方法。该法具有良好的理论基础,不仅考虑了测试构件与未测试构件之间的差别,而且能够合理反映测量不确定性、空间不确定性对推断结果的影响,推断结果与一般的工程判断一致,实例分析的结果亦具体说明了这一点。该文的方法还可推广到对既有结构当前恒荷载的推断。
The in-site material strength of existing structures is an uncertain quantity which is objectively certain but subjectively uncertain.The current interval estimation method is a probability inference approach,which is not suitable for the estimation of realistic material strength of existing structures.Based on the characteristics of existing structures,the paper analyzes the flaw of interval estimation method and then proposes the belief inference method for the estimation of material strength of existing structures.Based on reliability theory,the belief inference method can reflect the effect of measurement uncertainty and space uncertainty to inference results.Moreover,the difference between tested and untested structural members is taken into account.Exampled analysis results demonstrate that inference results are consistent with the engineering judgment.Moreover,the method could also be extended to infer the in-site permanent loads of existing structures.
出处
《工程力学》
EI
CSCD
北大核心
2011年第2期57-61,共5页
Engineering Mechanics
基金
国家自然科学基金项目(50678143)
关键词
既有结构
材料强度推断
区间估计
信度
荷载推断
existing structure
material strength inference
interval estimation
belief function
loads inference
