基于有限元法的钢筋混凝土结构损伤识别

The Structural Damage Identification Technology Based on the Finite Element Method for Reinforced Concrete

结构损伤识别方法是桥梁结构健康监测系统的重要组成部分,也是目前国际上工程界研究的热点问题,具有很强的工程背景和重要的实用价值。基于此,提出了一种基于可降阶有限元模型与自适应均方误差的损伤检测方法对线性结构和非线性结构进行损伤识别,同时通过试验数据来验证该方法对结构损伤预测的有效性。试验结果说明,该方法能有效识别钢筋混凝土结构的时变非线性参数,包括刚度,强度衰减量及结构的箍缩效应,给工程实践提供重要参考价值。

Structural damage identification is the important aspect of the bridge structural health monitoring system; it is also a hot topic in international engineering field at present and it has very important engineering background and practice value. Based on this, it was proposed that a combination of the reduced - order finite - element model and the adaptive quadratic sum - square error with unknown inputs method identifies the damage of linear and nonlinear structure, and the experimental data of the test is used to illustrate the performance of the proposed damage identification method. The experimental results showed that the proposed damage identification method is capable of identifying time - varying nonlinear parameters, including stiffness and strength degradations as well as the pinching effect, which provides an important value for engineering practice.