09-22-2010, 09:24 AM
This publication has been developed to provide guidance as to how the direct displacement-based design methodology can be codified. It is intended for insertion within the seismic requirements of a code, establishing how design forces can be obtained using a Direct Displacement-Based Design (DDBD) approach. The document has currently been drafted with reference to several clauses of Eurocode 8. This document is presented in a traditional “Code + Commentary” format, on a split two-column page. The commentary aims to generally clarify the code requirements and indicate references where the background and further discussion on the requirements can be found. The document is the product of a 3-year Italian research initiative into the displacement-based design and assessment of structures as part of the RELUIS (Rete dei Laboratori Universitari di Ingegneria Sismica) project. The bulk of the text and requirements in this code have been developed from the recommendations provided in the book on DDBD by Priestley et al. (2007) and from the work carried out by the various research units of RELUIS Linea IV. Currently the model code has been prepared for a specific range of building structures and bridges. Given the limited range of structures that could be considered to date, the model code does not yet cover all structural systems and materials. In addition, a number of novel recommendations have been proposed that are preliminary in nature because of the limited amount of experimental or analytical data on which they are based. Future versions of this document will look to refine the current recommendations and extend the guidelines to encompass a more complete range of structural systems. With this in mind, the Model Code is published as a draft subject to public enquiry. Readers are kindly invited to provide feedback on the design recommendations by December 1st 2009. The bulk of the text and requirements in this code have been developed from the recommendations provided in the book on Direct Displacement-Based Seismic Design of Structures by Priestley et al. (2007). In fact, this Model Code was developed using Chapter 14 of the book as a starting point. The editors therefore wish to extend special thanks to the first author of the book, Nigel Priestley, for his invaluable contributions to this work, without which the Model Code would never have been possible.