钢筋混凝土空间网格结构曲率模态曲面拟合损伤识别研究

Damage detection based on surface fitting of curvature mode for a reinforced concrete spatial lattice structure

介绍钢筋混凝土空间网格结构的体系组成及构造特点;提出曲率模态曲面拟合损伤识别理论,定义曲率模态曲面拟合损伤指标CMSFDI_i与平均曲率模态曲面拟合损伤指标CMSFDI_i^A,通过曲率模态与曲面拟合值的差异进行损伤定位,仅需利用从损伤结构获得的实测数据即可进行结构损伤识别,无需利用完好结构的基本信息和理论模型;最后通过钢筋混凝土正交正放空腹网架结构实例,验证方法的有效性。计算结果表明,该方法不仅可识别单位置损伤也可识别多位置损伤,对钢筋混凝土空间网格结构损伤识别及健康监测可行、有效。

Firstly, structure were introduced the system configuration and structural characteristics Then, the curvature mode surface fitting-based damage curvature mode surface fitting damage index （ CMSFDIi ） and the average damage of a reinforced concrete spatial lattice identification theory was proposed. The index （ CMSFDIi ） of curvature mode surface fitting were defined, respectively. The damage could be located with the difference between a curvature mode and its fitted value. A damage identification was performed only using the measured data obtained from a damaged structure rather than the information of the corresponding intact structure and its theoretical model. Finally, an orthorhombic reinforced concrete open-web grid structure was taken as an example to illustrate the feasibility and effectiveness of the method. The results showed that this method can not only identify the single-location damage but also the multi-location damage; it is suitable for damage identification and structural health monitoring of a reinforced concrete spatial lattice structure.