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Civil MDC

Guide for the Analysis and Design of Reinforced and Prestressed Concrete Guideway Structures (ACI 343.1R-12) 2

Guide for the Analysis and Design of Reinforced and Prestressed Concrete Guideway Structures (ACI 343.1R-12)

Description

The recommendations in this guide provide public agen-cies, consultants, and other interested personnel with comprehensive criteria for the design and analysis of concrete guideways for public transit systems. They differ from those given for bridge design and analysis in ACI 343R, American Association of State Highway and Transportation Officials (AASHTO) bridge specifications (AASHTO 2002, 2009, 2011, 2012), and the American Railway Engineering and Maintenance-of-Way Association (AREMA) Manual of Railway Engineering (AREMA 2012). This document provides guidance related chiefly to the design of guideway superstructures. For the design of substructure units, the reader is referred to other references such as AASHTO LRFD Bridge Design Specifications (AASHTO 2012).

ACI provides a comprehensive list of definitions through an online resource, “ACI Concrete Terminology,” http://terminology.concrete.org. Definitions provided herein complement that resource. bogie—wheeled frame connected via a suspension system to a railway vehicle body or underframe. broken rail—fracture of a continuously welded rail. continuously welded rail (CWR)—running rails that act as a continuous structural element as a result of full pene-tration welding of individual lengths of rail; continuously welded rails may be directly fastened to the guideway, in which case their combined load effects should be included in the design.

Flexural natural frequency—first vertical frequency of vibration of a guideway, including all the sustained load, based on the flexural stiffness and mass distribution of the superstructure .linear induction motor (LIM)—AC linear motor that works by the same general principles as other induction motors but which has been designed to directly produce motion in a straight line.standard vehicle—loading, design vehicle-forces repre-senting the wheel pattern and total weight including carriage, bogie, and passenger loads, of a railway vehicle


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