| 易伟建,刘霞.弹性地基梁损伤诊断研究[J].计算力学学报,2003,20(4):467~471489 |
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| 弹性地基梁损伤诊断研究 |
| Damage diagnosis of beams on elastic foundation |
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| DOI：10.7511/jslx20034088 |
| 中文关键词: 弹性地基梁 损伤诊断 振动模态 遗传算法 结构损伤 |
| 英文关键词:damage diagnosis,genetic algorithm,beam on elas tic foundation |
| 基金项目:国家自然科学基金 (599780 1 5)资助项目 |
| 易伟建 刘霞 |
湖南大学土木工程学院 湖南长沙410082
(易伟建)
，湖南大学土木工程学院 湖南长沙410082(刘霞)
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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. |
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