基于附加质量的梁损伤识别影响因素分析

为了提高基于附加质量的梁结构损伤识别精度,对附加质量影响因素进行了综合分析。根据梁结构损伤识别的附加质量法,建立梁结构有限元模型,并计算其损伤部位以及损伤程度,同时研究附加质量的大小、数目及位置对结构损伤识别的影响。在验证附加质量法对梁结构损伤识别有效性的基础上,采用不同的质量块附加在梁结构的不同位置进行损伤识别,由得到的损伤识别结果计算损伤识别误差。研究结果表明:附加质量后损伤识别精度有较大提升,有效降低了识别误差;随着损伤程度的增加,识别误差在逐渐增大,附加质量法对小损伤具有较好的识别效果;附加质量的大小和数目是提高梁结构损伤识别精度的主要因素,附加质量的位置对损伤识别结果的影响也不容忽视。

Influencing factors of beam structure damage identification based on additional mass

To improve the identification accuracy of the beam structure damage based on additional mass, the influence factors of additional mass were analyzed comprehensively. According to the additional mass method for damage identification of beam structure, the finite element model of beam structure was established,the damage identification carried out, and the influence of the size, number and position of the added mass on the structural damage identification also analyzed. On the basis of verifying the effectiveness of the additional mass method for damage identification, the damage identification was conducted by using different mass blocks attached to different locations of the beam structure, and the damage identification error calculated by the damage identification results. The results show that the recognition accuracy after additional mass has been greatly improved,which effectively reduces the recognition error; that with the increase of the degree of damage, the recognition error is gradually increasing, and the additional mass method has better recognition effect on small damage; and that the size and number of additional mass are the main factors to improve the identification accuracy of the beam structure damage, while the effect of the position of the added mass on the damage identification can not be ignored.