【作者】 陈磊；

【导师】 王立成；

【作者基本信息】 大连理工大学 ， 结构工程， 2013， 硕士

【摘要】 港口混凝土结构通常处于荷载和恶劣环境因素的共同作用之下,造成结构构件由于耐久性失效而过早破坏的工程实例时有发生,甚至产生严重的安全问题。为了有效利用港口的有限资源,避免港口工程过早破坏给使用者带来安全、经济上的损失,以及使用上的不便,亟需从设计阶段对港口工程全寿命周期的性能进行研究,并以此为依据建立港口工程全寿命周期设计指标体系。本文分别从绿色评价和性能评价两方面对港口工程混凝土结构全寿命设计指标开展了系统研究,建立了港口工程绿色指标评价体系,以及综合港口工程时间指标、性能指标和经济指标的性能评价体系,并在此基础上开发了港口工程全寿命设计指标评价软件系统。具体开展的研究及结论如下：(1)分析了国内外关于港口工程混凝土结构耐久性的工程调查结果,对港口工程耐久性敏感构件进行了分类。建立了氯盐侵蚀环境下钢筋混凝土结构使用寿命的评估模型,并考虑维修策略,对耐久性敏感构件进行了全寿命周期使用寿命评估。通过算例分析表明,该模型可以用于港口工程混凝土结构耐久性敏感构件使用寿命的预测。(2)开展了港口工程混凝土结构性能指标和经济指标研究。建立了港口工程混凝土结构可靠度指标与时间的关系。提出了港口工程混凝土结构全寿命成本计算模型。通过算例分析进行了多种设计方案的对比,利用提出的计算模型,确定了成本最优的设计方案。(3)在总结国内外绿色评价方法研究现状的基础上,阐述了评价港口工程绿色度的重要性,建立了将可持续发展、环境保护等环境指标与用户满意程度相结合的港口工程全寿命周期绿色指标评价体系。采用基于三标度法及梯形模糊数的层次分析法对建立的绿色指标体系进行了分析。通过算例分析表明,该绿色指标体系及模糊层次分析方法能够用于港口工程绿色指标的评价中。(4)开发了港口工程全寿命设计指标评价系统。该系统能对处于不同环境条件下和不同部位的港口工程混凝土结构构件的时间指标、性能指标、经济指标以及绿色指标进行分析和评估,从而为港口工程的全寿命设计提供技术支撑。更多还原

【Abstract】 Port concrete structures are usually under the combination effect of loading and aggressive environment, resulting in premature failure of structural members, even creating serious security problems due to the inadequate durability. Therefore, it is urgent to predict the life-cycle performance of port engineering from the design stage, and to establish the life-cycle design index system of port engineering accordingly. On the one hand, limited resources of the port will be used efficiently. On the other hand, it can avoid the possible loss of security and economy caused by the premature failure of port structures. This paper carries out the systematic research on the life-cycle design index of port concrete structures from two aspects, including green evaluation and performance evaluation. Green index evaluation system of port engineering and performance evaluation system integrated time index, performance index and economic index of port engineering, are built up, on the basis of which the life-cycle design evaluate software system of port engineering is developed. The conclusions are as follows:(1) The results durability survey of port concrete structures are analyzed. And then, the duralility-sensitive members of port structures are classified. The service life assessment model of reinforce concrete structures in chloride corrosion environment is established and the maintenance strategy is considered, so the life-cycle service life assessment of sensitive members can be achieved. It is verified by a case study that the model can be used for predicting the service life of the sensitive members of port concrete structures.(2) The research of port concrete structures performance index and economic index is carried out, which is based on the research of the service life of port engineering concrete structures. The relationship between reliability index of port concrete structures and time is establishment. The life-cycle cost model of port concrete structures is also proposed. Several design plans are compared and the result show that the proposed calculation model can be use to determine the cost-optimal design plan.(3) The research status of green evaluation is summarized, and the importance of the evaluation of port engineering green degree is explained. The green index system, which combines the factors associated with sustainable development and environmental protection with the consumer satisfaction, is built up. The analytic hierarchy process (AHP) applied the three-scale method and the trapezoidal fuzzy number is used to analysis the green indicator system. A numerical example shows that the green indicator system and its fuzzy analytic hierarchy process method can be used in the evaluation of the port engineering green indicator. (4) The evaluation system of life-cycle design index of port engineering is developed. The evaluation system can be used to analyze and evaluate time index, performance indicator, economy index, and green index of port reinforced concrete structural components under different environmental conditions and different parts, which provide technical support for the life-cycle design of port engineering.更多还原