(西安建筑科技大学土木工程学院，西安 710055)

［摘要］在既有结构的可靠性评定中，目前对单个构件当前抗力的推断并没有明确的方法，为此分别提出了基于几何参数、材料性能测试结果和基于相关性分析的推断方法。两种方法均考虑了既有构件的特点、几何参数和材料性能的信息以及测量不确定性、空间不确定性对测试结果的影响，第二种方法还充分利用了与抗力相关的刚度、挠度、裂缝宽度等其他方面的信息，使构件抗力的推断建立在更充实的信息基础上。实例分析的结果表明，在测试结果相同的情况下，采用基于几何参数、材料性能测试结果的推断方法可得到更有利的抗力推断结果，采用基于相关性分析的推断方法可正确反映刚度等对抗力推断结果的影响。

［关键词］既有结构；抗力；信度；相关性；不确定性

中图分类号：TU311-4文献标识码：A文章编号：1002-848X(2011)05-0120-05

Method for inferring current resistance of a single member based on belief function

Yao Jitao, Xie Yaokui(School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)

Abstract:In the reliability assessment of the existing structure, there are no specific methods to infer the current resistance of a single member. Therefore, two inference methods based on tested data of geometrical parameter and material property and based on correlation respectively were proposed. The two methods both consider the characteristics of existing structures, the tested data of geometrical parameter and material property and affection on test results of measurement uncertainty and space uncertainty. The second method even makes full use of other information in respects of stiffness, deflection, crack width and so on which interrelate with resistance. It makes the inference of member resistance build on much sufficient groundwork of information. Example analysis results show that the method based on tested data of geometrical parameter and material property can get reasonable inferring results in the same tested data. The inference method based on correlation can properly reflect the stiffness affect on result of inferring resistance.

Keywords:existing structure; resistance; belief function; correlation; uncertainty

*国家自然科学基金资助项目（50678143）。

作者简介：姚继涛，博士，教授，Email:yaojitao@163.com。

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