【作者】 朱海峰；

【导师】 李晓文；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2004， 硕士

【摘要】 近年来，由于新材料技术、信息技术及计算机技术的快速发展及其与其他传统行业的逐步结合，高科技正迅速渗透到包括土木工程在内的各个行业之中，具有仿人智能功能和生命特征的土木工程结构正在一步一步变为现实。 对在役结构进行状态监测、损伤检测、健康诊断、安全评估和灾难预警，将有利于从根本上消除隐患，并避免灾难性事故的发生。智能结构及其健康诊断成为近年来业内人士的研究热点，而且已经成为各国政府、科研机构和专家学者的投资热点和研究热点。 本文对智能结构的理论框架及其健康状态的检测与监测进行了一些探索和研究。 首先针对智能结构的理论和应用研究现状，明确地阐明了智能结构的定义和概念，全面论述了智能结构构成要素；论述了智能结构健康诊断的实现方式——人工神经网络的模式识别法；论述了智能结构的研究内容，指出了智能结构的设计特点及流程。 其次，论述了基于振动的结构健康(损伤)检测的原理，从力学反问题的角度出发，论述了智能结构的智能计算的两种思路——无几何模型的计算智能法和有几何模型的有限元法。通过对这两种计算路线的比较，提出了一种优化的智能结构计算方案，即充分利用各自的优点，将有限元和神经网络结合起来应用于智能结构中。还介绍了应用于工程中的人工神经网络的原理和网络结构设计及其改进方法。 最后，提出了具体的智能化算法，基于BP网络的结构健康状态的诊断方法——分层逐步识别法。结合数值算例，对一个两跨三层框架结构，建立BP网络模型，对结构的损伤位置和损伤程度进行了模拟试验及识别。模拟试验表明恰当的神经网络模型具有较好损伤识别能力，然而对于损伤程度识别的精度问题，还需要进一步深入的研究。更多还原

【Abstract】 In recent years ,as the technologies of new materials ,IT and computer rapidly develop and combine with the traditional productive mode ,the Hi -tech has been rapidly penetrating almost all of industries including civil engineering .The civil engineering structures which has the intelligent functions like the human being are becoming realities .It will be advantageous to remove dangerous things and prevent potential catastrophic events through respecting condition, detecting damage, diagnosing health, and evaluating safety of the building structures in service. The thought of intelligent structure and health diagnosis of it was brought forward frequently by the research in the field of civil engineering, and the research of this field has become hit of invest and research.In this paper, the author has done some research works on the theory frame of the intelligent structure, the detection and health condition inspection of it.Firstly, aiming at the state of intelligent structure the art on the theoretic and applied research work ,clearly define the conception of the intelligent structure ;discuss the components of the intelligent structure; introduce the characteristic of artificial neural net (ANN) which is used on the civil engineering structure ;discuss the method that is suit to the intelligent structure-mode identification based on ANN ; discuss the research content of the intelligent structure; and both the characteristic of the intelligent structure design and its flow chart are discussed.Secondly ,the structural health (damage) detection method based dynamics is discussed ;from the point of view of inverse problems in mechanics ,two trains of thought for solving the intelligent structure commutative problems are proposed ,i.e. :by means of intelligence computation method with geometrical modeling and by the aid of finite element method with geometrical modeling . By comparing the two methods, a feasible and optimum seeking method is presented to the intelligent structure commutative problems, which combinethe finite element method and ANN method.Finally, a detailed and intelligent solution is proposed for diagnosing the health condition of the structure, which based on BP neural net-the method identified step by step, combine with a numerical example .The frame structure is a two bays and three stories .Through establishing ANN model, simulating verification has been processed, which is to predict the damage location and severity .It has been shown that a proper ANN model has a comparatively strong ability on damage identification .However, numerical results also show that further research should be done to improve the precision of the damage identification.更多还原