| 摘要: |
| 为对钢筋混凝土梁进行动力破损评估，建立了钢筋混凝土梁的分离式有限元模型，推导了四节点矩形粘结单元的刚度矩阵。采用该模型计算了健康和局部破损梁的振动特性参数，计算结果与实际测试结果相吻合；计算及实际测试结果均表明。固有频率是进行钢筋混凝土梁损伤定性辨识的重要指标；曲率模态振型和应变模态振型对于钢筋混凝土梁的局部损伤较位移模态振型敏感。基于曲率模态振型和应变模态振型可以进行钢筋混凝土梁的局部损伤诊断。 |
| 关键词: 钢筋混凝土 结构动力分析 有限元方法 模态分析 |
| DOI：10.11841/j.issn.1007-4333.2005.03.086 |
| 修订日期：2004-12-01 |
| 基金项目: |
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| Study on vibrational detection method for local concrete damage of a reinforced concrete beam |
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| Abstract: |
| A separated finite element model for mechanical analysis of a reinforced concrete beam (RCB) was established in this paper and a stiffness matrix with 4-node sticking units was deduced. The parameters of vibrational characteristics for healthy and broken RCBs were calculated by the model and the mode parameters of a real RCB were tested. The calculation result proved to be valid. The natural frequency of a RCB is an important indicator to discriminate a RCB is damaged or not. Both the calculated and tested results indicated that the curvature mode shape and the strain mode shape were more sensitive to local damage of a RCB than the displacement mode shape, which enabled them to be used for detection of local damage in a RCB. |
| Key words: reinforce concrete,structural dynamic analysis,finite element method,modal analysis |
