采用动力响应推演及耗能差率的震损结构损伤演变快速评估

Rapid damage evolution assessment of seismic-damaged structure by us‑ing dynamic response derivation and energy dissipation difference ratio

准确且切实可行的损伤评估方法可对震损结构的损伤程度进行量化,并为结构修复加固提供有效指导。针对实际工程条件以及已有损伤评估或识别方法在精度和可行性方面的不足,在传统弹塑性耗能差损伤评估方法上提出通过剪力比值消除质量影响的广义损伤评估方法,仅以地震信号和结构动力响应即可实现对结构损伤的动态评估。在此基础上,提出用前震信号和Kalman滤波识别技术推演结构理想弹性响应,并利用主震信号实现结构整体和楼层损伤快速评估的方法。以钢混框架结构为例进行验证,结果表明:所提出的震损结构整体及层间损伤评估方法能够准确反映结构损伤的动态演变过程以及薄弱层的分布。与传统弹塑性耗能差方法以及基于频率变化率的损伤评估方法对比,所提方法具有良好的工程实用性,可为实际震损结构损伤快速评定提供有效支持。

According to the accurate and practical damage assessment method,the damage degree of the seismic-damaged structure can be quantified in real time,and the structural repair and reinforcement can be effectively guided.In view of the actual engineer⁃ing conditions and the shortcomings of the existing damage assessment or identification method in terms of accuracy and feasibility,a generalized damage assessment method is proposed based on the traditional elasto-plastic energy dissipation difference ratio meth⁃od,which eliminates the influence of mass by shear ratio.The dynamic damage assessment of structure can be realized only by seis⁃mic signal and structural dynamic response.On this basis,a method is proposed to deduce the ideal elastic response of the structure by using the foreshock signal and Kalman filter identification technology,and to realize the real-time damage assessment of the whole structure and floors by using the main shock signal.Taking two reinforced concrete frame structure as analysis examples,the results show that the proposed method can accurately indicate the dynamic evolution process of the overall damage and the distribu⁃tion of weak stories.Compared with the traditional elasto-plastic energy dissipation difference ratio method and the damage assess⁃ment method based on frequency change rate,this method has good engineering practicability and can provide effective guidance for the rapid damage assessment of actual earthquake damaged structures.