既有建筑结构安全性综合评定方法研究

发布时间：2018-04-16 15:27

本文选题：既有结构 + 传力路径　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：既有建筑结构在建成之后,结构本身不断经历外界自然环境和人为作用的影响,加之本身结构随着时间的流逝而不断的老化,原有使用性能和抗击灾害的能力逐步退化,当结构安全趋于极限状态时,将直接威胁到既有结构的结构安全。为了使其能继续发挥应有作用,就需要对既有建筑结构进行安全性评定,为维护、维修、加固改造提供相关依据。当前,我国既有建筑结构安全性评定方法有待进一步研究,而本文以提高既有建筑结构安全性评定结论的准确性和科学性为目的,展开对既有建筑结构安全性综合评定方法的研究,主要研究内容如下:(1)既有建筑结构安全性评定基础理论的研究。结合既有建筑结构安全性评定的研究现状及文献资料,系统地梳理了既有建筑结构可靠性的理论基础,深入研究了既有建筑结构安全性评定的基础理论,通过对理论的分析,结合国内外相关研究现状,综合分析了现行既有建筑结构安全性评定方法中存在的问题。(2)既有建筑结构安全性综合评定指标体系的研究。通过对安全性评定案例的分析,结合相关规范资料分析梳理了既有建筑结构(木结构、砌体结构、混凝土结构、钢结构这四种结构形式)安全性的影响因素和评定内容,结合结构体系的传力路径对构件重要性级别进行划分,最终构建了既有建筑结构安全性评定指标体系,用Lagrange条件极值的组合赋权法对权重进行了核算。(3)既有建筑结构安全性综合评定模型的研究。通过对定性及定量评估方法各自特点及其适用性的归纳分析,结合建立的评定指标体系,综合考虑选用物元可拓法建了既有建筑结构安全性综合评定模型,分别对指标体系的量化、关联函数的建立、评定标准和流程等内容进行了逐一分析。(4)既有建筑结构安全性综合评定模型的实例分析研究。以北京某金融商务区展示中心安全性鉴定项目为算例,运用本文建立的既有建筑结构安全性评定方II法对北京某金融商务区展示中心项目进行安全性进行评定,最后给出一个量化的评定结果,验证模型的可行性和适用性,为后续软件的研发奠定基础。(5)既有建筑结构安全性综合评定决策辅助计算软件研究与应用。考虑到既有建筑结构安全性综合评定方法中的模型计算过于复杂,通过手工计算过于繁琐,并考虑能够实现合理、快速、有效地安全性评定,专门研究编制了相应的辅助计算软件。该软件是基于.net平台开发研制的,主要包括木结构、砌体结构、混凝土结构、钢结构四个部分内容。最后通过实例论证了该计算软件有效性和可行性。
[Abstract]:After the construction of the existing building structure, the structure itself has experienced the influence of the natural environment and the artificial action continuously, and the structure of the existing building structure has been aging with the passage of time, and the original performance and the ability to resist disasters have been gradually degraded.When the structure safety tends to the limit state, it will directly threaten the structure safety of the existing structure.In order to make it continue to play its due role, it is necessary to evaluate the safety of the existing building structure, to provide relevant basis for maintenance, repair, reinforcement and transformation.At present, the safety assessment method of existing building structure in our country needs to be further studied, and the purpose of this paper is to improve the accuracy and scientific nature of the safety assessment conclusion of existing building structure.The main contents of this paper are as follows: 1) the basic theory of safety assessment of existing building structures.Combined with the present situation and literature of safety assessment of existing building structures, this paper systematically combs the theoretical basis of reliability of existing building structures, deeply studies the basic theory of safety assessment of existing building structures, and through the analysis of the theory,Combined with the current research situation at home and abroad, this paper comprehensively analyzes the problems existing in the existing methods of safety assessment of existing building structures and the study of the comprehensive evaluation index system for the safety of existing building structures.By analyzing the case of safety assessment and combining with the data of relevant codes, this paper analyzes the influencing factors and evaluation contents of the safety of existing building structures (wood structure, masonry structure, concrete structure and steel structure).Combined with the load transfer path of the structural system, the importance level of the component is divided, and finally, the evaluation index system of the safety of the existing building structure is constructed.The combined weighting method of Lagrange condition extremum is used to calculate the weight. 3) the comprehensive evaluation model of the safety of the existing building structure is studied.Through the induction and analysis of the characteristics and applicability of the qualitative and quantitative evaluation methods, combined with the established evaluation index system, the comprehensive assessment model of the safety of the existing building structures is built by using the matter-element extension method.The quantification of the index system, the establishment of the correlation function, the evaluation standard and the flow chart are analyzed one by one.Taking the safety appraisal project of a financial business district exhibition center in Beijing as an example, the safety evaluation method of the existing building structure safety assessment square II is used to evaluate the safety of a financial business district exhibition center project in Beijing.Finally, a quantitative evaluation result is given to verify the feasibility and applicability of the model, which lays a foundation for the research and development of subsequent software.Considering that the model calculation in the comprehensive assessment method for existing building structures is too complicated and that the manual calculation is too cumbersome, and that it can realize reasonable, rapid and effective safety assessment,The corresponding assistant computing software has been developed specially.The software is developed based on .net platform and includes four parts: wooden structure, masonry structure, concrete structure and steel structure.Finally, the validity and feasibility of the software are demonstrated by an example.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU317

【参考文献】