论文部分内容阅读
大坝在运行过程中,外界荷载或地震作用会引起大坝振动,通过坝体布置的加速度传感器可获得大坝实时的加速度动力响应信息.充分挖掘这些信息诊断大坝损伤情况对大坝的安全运行至关重要.利用动力响应信息建立ARMAX模型,经过转换可得到系统的脉冲传递函数,根据求出的各损伤情况下的脉冲响应系数建立一个损伤指标.混凝土重力坝的有限元模拟分析表明,笔者建立的损伤指标能有效识别和定位结构损伤,并能识别损伤的程度,对于小损伤敏感性较好.实际应用中,充分利用动力响应信息进行在线损伤识别,掌握大坝的实时健康状况,对混凝土重力坝的损伤识别有较好的应用价值.,During the operation of the dam,vibration induced by extal loads or earthquake,the response information can be obtained through the arrangement of acceleration sensors inside the dam.Fully excavating the acceleration information to diagnose structural health status plays an important role in the safe operation of the dam.The ARMAX model is established based on the dynamic response information.The pulse transfer function of the system can be obtained through the transformation;and then a damage index is established according to the impulse response coefficient of each damage condition.Finite element simulation analysis of concrete gravity dam shows that the damage index established in this paper can effectively identify and locate the structural damage,identify the degree of injury;and it’s sensitive to minimal damage.In the practical application;the dynamic response information is fully utilized for on-line damage identification,and the real-time health status of the dam is mastered;and it has great practical application value for damage identification of concrete gravity dams.