在役热力地下构筑物可靠度分析及耐久性评估
发布时间：2018-10-08 17:36
【摘要】：随着工程结构服役时间的推移,大量的混凝土结构进入老化阶段。由于耐久性损伤导致的建筑物或构筑物可靠度下降,带来了越来越大的经济损失,这使得钢筋混凝土结构的耐久性破坏成为迫切需要解决的问题,尤其是热力地下构筑物的耐久性损伤。而目前国内对以热力地下管沟(砖砌结构、钢筋混凝土结构、暗挖隧道以及结构内附件等)为代表的城市既有地下工程,缺乏针对结构处置的系统性研究。城市老旧热力地下构筑物进行翻修改造时在结构处置问题的判定上尚缺乏理论依据。本文利用现场检测、数值模拟等手段对在役热力隧道结构进行了可靠度计算和耐久性等级评估,具体的研究工作如下：(1)按照构筑物的类型,分别对砖砌与钢筋混凝土盖板组合结构、浇筑钢筋混凝土结构和喷射混凝土结构进行了现场检测与统计分析,得出了不同结构类型的技术状况和各检测项目的统计规律。(2)引入响应面法,利用Midas/Gen有限元分析软件分别对小室、隧道结构进行建模计算,得到了结构典型截面处荷载效应的统计特征,然后利用Matlab中的优化工具箱分别对小室与隧道结构进行了可靠度指标的计算。(3)运用模糊评价的方法将结构的耐久性评估分为两级,分别用层次分析法建立每一级各影响因素的权重集,最终根据贴近度法对30个工点分别进行了耐久性等级评估。(4)在对热力地下构筑物进行模糊评价的基础上,将模糊评价法与马尔科夫过程相结合,以华能线10#工点为例,对其进行了剩余寿命预测,为隧道在未来使用过程中的维修加固提供了理论依据。
[Abstract]:As the service time of engineering structure goes on, a large number of concrete structures enter the aging stage. Due to the deterioration of the reliability of buildings or structures caused by durability damage, it brings more and more economic losses, which makes the durability damage of reinforced concrete structures an urgent problem to be solved. Especially the durability damage of thermal underground structures. At present, there is a lack of systematic research on the existing underground engineering in the cities represented by thermal underground pipe trenches (brick structure, reinforced concrete structure, tunneling and internal structure accessories), and lack of systematic research on the disposal of structures. There is no theoretical basis for judging the problem of structure disposal when the old urban thermal underground structure is renovated and renovated. In this paper, reliability calculation and durability grade evaluation of existing thermal tunnel structures are carried out by means of field inspection and numerical simulation. The specific research work is as follows: (1) according to the type of structure, The combined structure of brick and reinforced concrete cover slab, the reinforced concrete structure and the shotcrete structure are tested and analyzed respectively. The technical status of different structure types and the statistical rules of each test item are obtained. (2) the response surface method is introduced and the cell and tunnel structures are modeled and calculated by using Midas/Gen finite element analysis software. The statistical characteristics of the load effect at the typical section of the structure are obtained, and then the reliability index of the chamber and tunnel structure is calculated by using the optimization toolbox of Matlab. (3) the durability evaluation of the structure is divided into two levels by using the fuzzy evaluation method. The weight sets of each influencing factor are established by AHP, and the durability grade of 30 working points is evaluated according to the closeness degree method. (4) on the basis of fuzzy evaluation of thermal underground structure, This paper combines fuzzy evaluation method with Markov process and takes 10# point of Huaneng Line as an example to predict its residual life which provides a theoretical basis for the maintenance and reinforcement of tunnel in the future.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU311.2
本文编号：2257671
[Abstract]:As the service time of engineering structure goes on, a large number of concrete structures enter the aging stage. Due to the deterioration of the reliability of buildings or structures caused by durability damage, it brings more and more economic losses, which makes the durability damage of reinforced concrete structures an urgent problem to be solved. Especially the durability damage of thermal underground structures. At present, there is a lack of systematic research on the existing underground engineering in the cities represented by thermal underground pipe trenches (brick structure, reinforced concrete structure, tunneling and internal structure accessories), and lack of systematic research on the disposal of structures. There is no theoretical basis for judging the problem of structure disposal when the old urban thermal underground structure is renovated and renovated. In this paper, reliability calculation and durability grade evaluation of existing thermal tunnel structures are carried out by means of field inspection and numerical simulation. The specific research work is as follows: (1) according to the type of structure, The combined structure of brick and reinforced concrete cover slab, the reinforced concrete structure and the shotcrete structure are tested and analyzed respectively. The technical status of different structure types and the statistical rules of each test item are obtained. (2) the response surface method is introduced and the cell and tunnel structures are modeled and calculated by using Midas/Gen finite element analysis software. The statistical characteristics of the load effect at the typical section of the structure are obtained, and then the reliability index of the chamber and tunnel structure is calculated by using the optimization toolbox of Matlab. (3) the durability evaluation of the structure is divided into two levels by using the fuzzy evaluation method. The weight sets of each influencing factor are established by AHP, and the durability grade of 30 working points is evaluated according to the closeness degree method. (4) on the basis of fuzzy evaluation of thermal underground structure, This paper combines fuzzy evaluation method with Markov process and takes 10# point of Huaneng Line as an example to predict its residual life which provides a theoretical basis for the maintenance and reinforcement of tunnel in the future.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU311.2
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