Detecting Multiple Open Cracks in Elastic Beams by Static Tests
Detecting Multiple Open Cracks in Elastic Beams by Static Tests
复制标题
DOI：
10.1061/(asce)em.1943-7889.0000209
复制
发表时间：
2011-02
期刊：
影响因子：
--
通讯作者：
S. Caddemi;A. Morassi
中科院分区：
文献类型：
--
作者：
S. Caddemi;A. Morassi
本文讨论了在规定荷载条件下，通过测量梁的静挠度损伤引起的变化来识别梁中的多个开放裂缝。每个裂缝由连接梁的两个相邻部分的等效线性弹簧模拟。给出并讨论了在某些理想边界条件下，非均匀梁的静态测量的充分条件，这些条件允许对损伤进行唯一的识别。逆分析是基于在给定荷载分布下裂缝引起的梁挠度变化的显式表达式，它根据实测数据提供了裂缝位置和严重程度的精确封闭形式表达式。通过与局部损伤钢梁的静力试验对比，验证了理论结果。
This paper concerns with the identification of multiple open cracks in a beam by measurements of the damage-induced variations in the static deflection of the beam under a prescribed load condition. Each crack is simulated by an equivalent linear spring connecting the two adjacent segments of beam. Sufficient conditions on the static measurements which allow for the unique identification of the damage are presented and discussed for nonuniform beams under some ideal boundary conditions. The inverse analysis is based on an explicit expression of the crack-induced variation in the deflection of the beam under a given load distribution and it provides exact closed-form expressions of position and severity of the cracks in terms of the measured data. The theoretical results are confirmed by a comparison with static tests carried out on a steel beam with localized damages.