UBC Theses and Dissertations
Analysis method for the design of reinforced concrete bridge barrier and cantilever deck under railing loads as specified in CAN/CSA-S6-00 (Canadian highway bridge design code) Wong , Joe
The objective of this thesis is to develop a rational and effective method for designing reinforced concrete bridge parapets and cantilevered decks so that such a method could be easily applied in practice against railing loads, as specified in the CAN/CSA-S6-00 Canadian Highway Bridge Design Code. The maximum moment dispersal angle (MMDA) is the most promising overall of the methods being considered for this task, including yield line analysis (YLA), finite element analysis (FEA) and the dispersal angle method. The MMDA provides a means of approximating maximum moments, which were evaluated using the linear elastic FEA at locations of interest on both the traffic barriers and the deck overhang using dispersal angles, which are provided in the form of tables. The MMDA is an improved version of the maximum moment envelope (MME) method, which had been initially developed based on concepts from the dispersal angle method as well as the FEA. The improved MMDA method takes advantage of the accuracy of FEA and the simplicity of the classic concept of load dispersion, while eliminating some of the issues of unconventionality found in the dispersal angle method. Hence, MMDA is an improvement on the dispersal angle method, as was suggested in the Commentary of S6-00. It minimizes possible inconsistencies between the code design methods and the FEA results. This thesis summarizes the design criteria, methods of analysis, and load applications for bridge traffic barriers and deck overhang design that has been suggested by various jurisdictions, including AASHTO LRFD Bridge Design Specifications 2004, Washington State DOT Bridge Design Manual LRFD, CAN/CSA-S6-88 Design of Highway Bridges and CAN/CSA-S6-00 Canadian Highway Bridge Design Code.
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