A integrated research on the performance based design of earth structures and their risk assessment, management and social systems.

我国的许多设计规范正在向基于性能的规范格式发展。政府的政策是遵循WTO/TBT协议，并使设计规范与国际标准保持一致，例如符合IS02394。基于性能的规范种类繁多，各种组织和机构提出了许多可供选择的想法。整个图景还没有被聚焦。然而，问题的方向需要更准确地预测结构响应和量化设计中涉及的不确定性。显然，需要建立更合理的程序来评估和管理这一设计、施工和维护过程中涉及的风险。在此背景下，本文研究了以下几点：(1)回顾了传统的设计方法和基于数值分析的更复杂的设计方法(如有限元)，以确定它们的预测能力。(2)为了使基于性能的规范更受欢迎，需要建立一个能够对冲结构设计、施工和维护风险的社会制度。进行了一项调查，以了解欧洲国家的做法。研究发现，尽管“基于性能的规范”一词在欧洲还不是很流行，但在英国，“设计-建造”、“设计-建造-融资-运营”和“基于性能的设计经营”正变得越来越流行。(3)提出了将JGS-4001-2004“基于性能的设计理念的基础设计原则”扩展到土结构的草案。

Many of the design specifications in our country are now moving toward the performance based specification format. It is streaming from the government policy to follow WTO/TBT agreement and harmonize design codes to the international standards, for example to IS02394. The performance based specifications have wide varieties and many alternative ideas are proposed from various organizations and agencies. The whole picture has not yet been focused. However, the direction of the issue requires more accurate prediction of structural response and quantifications of uncertainties involved in the design. It also seems to be apparent that more rational procedure needs to be established to assess and manage the risks involved in this design, construction and maintenance process. Based on these backgrounds, the following points have been studied in this research :(1) The conventional design methods and more sophisticated design method based on numerical analysis such as FEM have been reviewed to identify their capability for prediction.(2) In order to make the performance based specifications more popular, a social system to hedge the risks concerning design, construction and maintenance of a structure is required. An investigation was carried out to see the practice of European countries has been conducted. It was found that, although the word 'performance based specifications' is not very popular in Europe, Design-Built, Design-Built-Finance-Operate and PFI are getting to be more and more popular in UK.(3) A draft to extend JGS-4001-2004 "Principles for foundation designs grounded on the performance based design concept' to the earth structures are proposed. Two chapters, namely 'embankment' and 'cut slopes' are drafted in this research.