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中文摘要：
为提高结构损伤识别方法的准确性和对噪声的鲁棒性,将多源信息融合技术引入到结构损伤识别方法中。针对模态应变能法诊断结构损伤一般需要完备模态的特点,采用信息融合技术对各阶模态应变能进行融合,建立了基于信息融合的改进的模态应变能法。通过对一座预应力混凝土组合箱梁桥损伤识别数值算例的分析,可以看出该方法具有良好的损伤敏感性,仅需要较少的低阶模态就可识别结构的早期损伤;同时,该方法具有噪声鲁棒性,当加入噪声等于或小于10%时可以准确识别结构的早期损伤。因此该文提出的基于信息融合的改进的模态应变能法具有较好的工程实用性。
英文摘要：
In order to improve the validity and robustness to noisy, multi-source information fusion technique is imported into structural damage identification methods. Concerning the characteristics of modal strain energy, in which whole modes should be included, information fusion technique is taken to have strain energy of every mode fused and the improved method based on modal strain energy is put forward. Through a numerical simulation of a prestressed concrete composite box beam bridge, it is revealed that this proposed method is sensitive to damage and can identify structural initial damage only with less low-order modes. At the same time, this method has good robustness to noisy. When noise intensity is less than or equal to 10%, this method can identify structural initial damage well and truly. In a word, the proposed structural damage identification method has good practicability to actual structures.
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