【作者】 姜峰；

【导师】 何钦象；

【作者基本信息】 西安理工大学 ， 工程力学， 2008， 硕士

【摘要】 大多数的工程结构,在遭受到地震、火灾等自然灾害或者长期的疲劳荷载和腐蚀作用下,常常会引起结构损伤,随着损伤的积累,其危险程度也逐步提高。结构损伤判断及损伤位置的确定,可以帮助人们对结构进行实时修复或改变结构的操作使用方法,以便降低结构的损伤积累程度,减少经济损失。因此,结构损伤诊断技术倍受国内外建筑行业的重视,但其作为一个新的研究领域发展并不完善,本文主要针对板结构提出了基于模态曲率差的损伤识别方法。首先,介绍了损伤识别技术在国内外的发展,对目前所采用的各种损伤识别方法的分类作了简单介绍,探讨损伤识别方法存在的问题和改进方法。其次,总结了基于模态曲率差的结构损伤识别方法的理论,给出采用这种方法进行结构损伤识别的基本原理、概念及数值计算方法。再次,以固支板和简支板为研究对象,采用改变单元弹性模量的方法模拟结构损伤,应用基于模态曲率差的损伤识别方法识别结构损伤。分析可知,用模态曲率差法进行结构损伤识别,仅有损伤单元的模态曲率差的值发生明显的变化,可以准确判定损伤的位置,但是损伤程度须借助其它方法综合判定。最后,利用ANSYS软件良好的开放性、可定制性,及其提供的二次开发途径,根据自身的需要在标准ANSYS版本上利用用户界面设计语言(UIDL)和参数化程序设计语言(APDL)进行功能扩充和系统集成,生成具有行业分析特点和符合用户需要的用户版本的ANSYS程序,从而实现设计和分析的易用性、高效性。更多还原

【Abstract】 Most of the engineering structures, when subjected to the natural disasters such as earthquake and fire or the action of the long-term fatigue loading and erosion, will often induce the damage of the structure. With the accumulation of the damage, its criticality will be gradually enhanced. The real time repair can be done and the means of the operation can be changed with the help of the judgment of the structure damage and the confirmation of the locality of the damage, so as to degrade the accumulation degree of the damage of the structure and reduce the economy loss.Consequently great attention is given to the diagnosis technique of the damage of the structure in the architecture industry domestic and abroad. But as a new study field, its development is incomplete. In this paper, the methods of the damage identification which are based on the difference of the curvature mode for the plates are brought forward.Firstly, the development of the damage identification technique of domestic and abroad is introduced. The classification of all kinds of damage identification methods which are usually adopted at present is simply introduced. The problems and the improvement of the methods of the damage identification are discussed.Secondly, the theories of the method of structure damage identification which are based on the difference of the curvature mode are summarized. The rationale of the method which is adopted to carry out the structure damage identification is presented. And the definition and the numerical analysis methods of the damage identification which are based on the difference of the curvature mode are presented.Thirdly, the clamped slab and the simply supported slab are taken as the study objects. The structural damage is simulated by changing the elastic modulus of elements. In this paper, the method of the damage identification which is based on the difference of the curvature mode is used. By analysis, the location of the structure damage can be identified exactly by using the method of the difference of the curvature mode because only the difference of the curvature mode of the damage element changed obviously. But the degree of the damage can not be identified by this method and must be generally determined by other methods.Finally, a non-standard ANSYS analysis module is created by using User Interface Design Language (UIDL) and ANSYS Parameter Design Language (APDL) at standard ANSYS version based on self-need because we all know that the ANSYS software has the excellence of the nice property of opening and its property of customization. So the use accessibility and the high effectiveness can be realized in the process of design and analysis.更多还原