Lecture 3

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Concordia University Portland *

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Civil Engineering

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Oct 30, 2023

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CIVI 390 CIVIL ENGINEERING DESIGN PROJECT Lecture 2: Bridge design prelimineries Department of Building, Civil and Environmental Engineering
2 Design Project Design a simply supported bridge with concrete deck on steel girders that serves as an overpass or stream crossing. The span is 20 m, double lanes on either way. Resources: Internet, Library, City Government, Students
Prelim report Introduction Group formation Location Preliminary cost (e.g., order of magnitude) Work-breakdown structure (WBS) – table of tasks, milestones and responsibility for the individual tasks Alternate designs (create Revit model for each of them) and comparison Based on the comparative analysis, select the best one Conclusions 3
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Slab on girder bridge 4 Bridge bearings – traditional steel bearings or modern elastomeric bearings
Loads on a bridge 5
Traffic loads 6
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Design philosophy Public safety Ultimate limit state Serviceability limit state Fatigue limit state Design life What is limit state? 7 For limit state design, we use load and Resistance factors. In the US, they call it LRFD The factors improve the reliability of the structure
Girders, diaphragm, cross- bracing 8
Bending and shear 9
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Bending and shear 10
Dead load on bridges 11
Traffic loads 12
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Influence line diagram 13
Influence line diagram 14
Questions! 15
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