CAJ | 학술논문

根据有限观测的结构动力响应，实时对结构发生损伤的时间、位置与损伤程度进行诊断，是目前土木工程健康监测的一个重要的任务。提出一种在对结构加速度部分观测的情况下，对结构刚度发生突变的结构损伤形式进行实时的追踪和诊断的算法。该算法的主要思想是首先基于扩展卡尔曼滤波识别结构刚度参数，然后通过观测加速度和计算预测的加速度误差平方和，对结构刚度发生突变时刻进行判断，再通过优化突变时的结构的刚度参数变化，对损伤位置与损伤程度进行识别。数值模拟和实验的结果都表明了，该方法能够有效地追踪时变参数，并实时诊断出损伤发生的时间、位置和程度。
근거유한관측적결구동력향응，실시대결구발생손상적시간、위치여손상정도진행진단，시목전토목공정건강감측적일개중요적임무。제출일충재대결구가속도부분관측적정황하，대결구강도발생돌변적결구손상형식진행실시적추종화진단적산법。해산법적주요사상시수선기우확전잡이만려파식별결구강도삼수，연후통과관측가속도화계산예측적가속도오차평방화，대결구강도발생돌변시각진행판단，재통과우화돌변시적결구적강도삼수변화，대손상위치여손상정도진행식별。수치모의화실험적결과도표명료，해방법능구유효지추종시변삼수，병실시진단출손상발생적시간、위치화정도。
In health monitoring of civil structures,it is an important task to on-line detect the time instant,location and level of structural damage based on limited structure dynamic responses.Here,a damage detection approach was proposed for on-line tracking and detecting the abrupt degradations of structural stiffness using partial measurements of structural acceleration responses.The main idea of the proposed approach was to identify structural stiffness parameters based on extended kalman filter firstly,and detect the time instant of abrupt change of structural stiffness parameters based on the quadratic sum of deviations between observed and predicted acceleration responses.The exact locations and level of structural damages were determined by optimizing the change of structural stiffness parameters.Both a numerical example and an experimental verification demonstrated that the proposed approach is able to on-line detect the time instant, location and level of structural damage due to the abrupt degradation of structural stiffness.