弹性地基梁损伤诊断研究

利用试验得到的振动参数评估结构的破损情况，是当前结构工程学科十分活跃的领域。由于弹性地基梁的振动模态受地基和梁两方面因素的影响，其损伤诊断问题变得十分复杂。本文通过对两靖自由弹性地基梁的灵敏性分析发现弹性地基梁的前两阶自由模态主要与地基有关，利用这一特性构造了两级识别的方法，并引入优化领域寻优能力极强的遗传算法进行识别，找到了令人满意的答案。

Damage diagnosis of beams on elastic foundation

Assessing the structural damage by vibration test is an active field in the st ructural engineering. The damage diagnosis is complex because the vibrational mo des of beams on an elastic foundation are influenced by two factors: the propert ies of foundation and those of beams. Based on the sensitive analysis of beams on elastic foundation with two ends being free, it is clear that the first two f ree vibrational modes are mainly related to features of foundation. According to this characteristic a two-step method is developed and the genetic algorithms, a powerful optimal tool, is applied to the diagnosis, then a satisfactory resul t is achieved.