A proposal of a model foundation design code based on limit state design concept

本研究提出一套以性能设计为基础，以极限状态设计概念为基础的模型基础设计规范。这项工作是基于1998年秋季在欧洲和北美的各种研究所和组织进行的世界范围的调查旅行，以及包括学术界，代码编写者和语言学家在内的研究小组20年的广泛讨论。建议的代码现在被命名为“岩土工程代码21版本。1、“成员”本法典的特点如下：1.日本的设计规范的统一不能通过编写与现有规范处于同一水平的另一个规范来实现。要实现这一统一，需要有更高层次的概念。Code 21提出了一个新的概念，称为综合设计代码。极限状态设计和性能设计概念都只是构成这一主要概念的组成部分.代码21可用作完全基于性能的设计代码。此外，它是以一种可以将此代码用作代码编写者的代码的方式编写的。因此，本规范可用于政府组织/地方政府机构/业主为其结构制定新的基础设计规范3。在传统的岩土工程设计规范中，甚至包括新开发的Eurocod 7，土壤参数特征值没有合理确定。在规范21中，对这一问题进行了新的尝试，使确定土壤参数特征值的方法更加规范化.一个全面的设计规范，如代码21，最先进的知识，对有关结构应包括在内。在大多数的努力，包括最佳数量的检查点，需要考虑在设计一个结构，特别是在'桩设计'一章。

A model foundation design codes based on performance based design and the limit state design concepts has been proposed in this research. This work is based on world wide investigation trips to the various institutes and organization in Europe and North America which were carried out in fall 1998, and 2years of extensive discussion of the research group which include academia, code writers and practicians. The proposed code is now named 'Geotechnical Code 21 ver. 1' by the members. The distinguished features of this code are as follows:1. Unification of design codes in Japan cannot be achieved by writing another code that is on the same level as the existing code. To accomplish the unification, a concept of the higher level is required. Code 21 has invented a new concept called A comprehensive design code. Both the limit state design and the performance design concepts are only components consisting this major concept.2. Code 21 can be used as a fully performance based design codes. Furthermore, it is written in a way that this code can be used as a code for code writers. Therefore, this code can be used to develop a new foundation design code by government organization/local government bodies/owners for their structures3. In conventional geotechnical design codes, including even newly developed Eurocod 7, soil parameter characteristic values are not reasonably determined. In Code 21, a new attempt is made on this problem which would lead to more standardized way to determine the characteristic values of the soil parameters.4. A comprehensive design code like Code 21, the sate of the art knowledge on the concerning structures should be included. At most efforts were made to include the optimum amount of check points that need to be considered in designing a structure especially in 'Pile design' chapter.