MULTI-PLATE PRODUCT GUIDE - Armtec

MULTI-PLATEDESIGN STANDARDSCanadian Highway Bridge Design Code (CHBDC)Introduced in 2001, Section 7 – Buried Structures of the Canadian Highway BridgeDesign Code (CAN/CSA S6) addresses the analysis and design of soil-metalstructures and metal box structures. The CHBDC method is based upon limitstates design procedures. It has become the recognized design standard forsoil-steel structures in Canada. The height of cover tables in this document weredetermined in accordance with this standard.American Iron and Steel Institute (AISI)American Association of State Highway and Transportation Officials(AASHTO)_NOTE:• The full CHBDC code is availablefrom CSA International as “CAN/CSA-S6 Canadian Highway BridgeDesign Code”• Additional details, including workedexamples, are also available in theCorrugated Steel Pipe Institute(CSPI) handbookWhile simple, easy to understand, and time-tested, the AISI and AASHTO designmethods have largely been displaced by the CHBDC method. Their use isgenerally limited to private development and non-government projects.Soil-Steel Interaction and RingCompression TheorySoil-steel interaction means that aflexible steel conduit (Corrugated SteelPipe Multi-Plate or Bridge-Plate) actswith the surrounding soil (backfill) tosupport dead and live loads. In order toundertake a design using the theory ofring compression the followinginformation is required:Live LoadsTrain or vehicular design loads aretypically specified in accordance withthe governing design code for theproject location. Various live loadconfigurations are identified in theCorrugated Steel Pipe Institute (CSPI)“Handbook of Steel Drainage andHighway Construction Products”• Live load• Height or depth of cover• Properties of the backfill [unit weight(density) and compaction level]• Pipe shape and dimensions (spanand rise)