等效剪切刚度的框架结构损伤识别方法

为研究有别于现有侧重于研究结构具体构件(梁、柱及支撑等)的建筑结构损伤识别方法,提出应直接从整体开展框架结构损伤识别方法.将框架结构转换成"等效剪切型"结构,数值分析表明,结构具体构件出现损伤(即刚度发生退化)时,会引起受影响层的等效剪切刚度发生变化,因此,可以采用层等效剪切刚度变化率与层抗侧刚度作为指标来进行结构损伤定位与损伤程度评定.通过大量的框架结构数值模拟计算,归纳出了一套能将损伤定位到结构层及从整体来评定结构损伤程度的方法.

Damage identification approach of frame structure based on equivalent shear stiffness

The paper proposes a damage identification method of frame structure based on equivalent shear stiffness (DESS) from the overall perspective, which is different from existing methods that focused on the components. Firstly, equivalent shear modal is employed to simplify the frame structure. Then, the change ratio of equivalent shear stiffness and the compositive sheer stiffness are used as the indexes for damage localization and damage severity estimation. A set of rules was concluded for localizing the damage floors, and estimating the damage degree. The results of mathematical deduction shows that the indexes are interrelated with only the natural vibration frequencies and modes, which could be detected by structure dynamic experimentation, so the damage identification method of DESS can be used for practical engineering.