Concrete Model Code for Asia

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Japan Concrete Institute, JCI,established an initiating research committee for Asian Concrete Model Code in May, 1992 under the chairmanship of Prof.Jun Yamazaki of Nihon University. A Model code is a model for people writing their national codes. "Asian" means that the model code is intended for use in construction in Asian societies and Asian environment. Our activities goal should be to create a Asian concrete model code, which should help construct better infrastructures, efficiently but in harmony with natural and social environment. With that goal, our target was first to make survey on design and construction practice of concrete work in various regions of Asia and then to create a framework of model code. Through the valuable discussions in five international workshops held in Bangkok, 1994, Tokyo and Gold Coast, 1995, Jakarta and Dalian, 1996, the first draft of the Asian Concrete Model code has been compiled by the International Committee members. The concepts of limit state design, reliable design and performance evaluating design code are introduced into the current Asian Model Code draft. The performance indices are defined to evaluate the performance levels of the overall structure synthesizing the characteristics of components. The indices are used to meet the needs of clients and for insurance rates. The following new concepts are introduced.(1) The document levels are classified into the following three levels.Level 1 : Overall goals and functional area of performanceLevel 2 : Operative requirements on performanceLevel 3 : Verification, guidelines or acceptable solutions(2) Performance Evaluating Code :Quantitative performance indices are proposed.(3) Performance is classified into a) against action and b) three design limit states :Service limit state (functional on use)Damage control limit state (economically repairable or strengthening)Ultimate limit state (no collapse)