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how can i design a bridge with this girder?

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Subject CSM20001: Design of Constructed Structures
Assignment No 1: Design of an RC bridge girder
Submission Date: Friday 8th November, 2019
An existing reinforced concrete box bridge girder is to be assessed for a proposed increase in vehicle
Consider the existing 2 span box-girder with the following geometry:
Cross section of girder
Elevation of girder
Figure 1 - Cross section properties
Each span is supported by columns and spans a total length of 9750mm.
Swinburne University of Technology
Page 1

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Subject CSM20001: Design of Constructed Structures
The task does not require you to calculate any external dimensions of slabs, beams or columns. The
architect has set the dimensions of the concrete profile and you are constrained with them. All slab
depths, beam widths and depths, and column dimensions have been provided in Figure 1. As a part
of the design, you are required to check the adequacy of these dimensions, and document the
reinforcement required, in accordance with AS3600-2018.
Design Criteria
The following criteria must be adhered to:
(a) All concrete to be of 28 day strength fc = 32 MPa.
(b) All reinforcing steel to be class N with 500MPa yield strength
(c) All reinforced concrete to be designed for a fire resistance period of 120 minutes.
(d) The office is located in Hawthorn, Victoria.
(e) An analysis of the loads has determined that the girder is required to take an unfactored dead
load (G) of 10 kPa (excluding self weight) and live load (Q) of 40 kPa.
Important Notes
All the lateral loads from wind and earthquakes are to be ignored.
You are not required to design for lateral loads due to wind and earthquakes.
Start your design by determining the required cover for durability and fire in
order to get the effective depths for the slab, beam and columns.
In order to estimate the design actions, use appropriate load combinations
listed in AS/NZS1 170.1 and in AS3600.
Use approximate methods of analysis to determine bending moments and
shear forces in the frame. Insert hinges to reduce structural indeterminacy
Ensure bar spacing and general detailing of reinforcement in accordance
with AS3600 are followed (for example, refer to Section 10.7.3 of AS3600
for detailing of column ties).
Design the beams slabs and columns for bending, shear and axial loads and
determine the amount of steel reinforcement required to resist the critical
design actions.
Detail your solution in the form of drawings.
Swinburne University of Technology
Page 2

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Subject CSM20001: Design of Constructed Structures
General Instructions
All final design submissions must be completed on computation sheets (non-Swinburne
University computation sheets are acceptable).
The first page of your design must be marked A and is a title page, containing the name of the
person(s) responsible for the submission, and the project title. The second page marked B is the
index of the succeeding pages of computations and sketches. The following pages should be
numbered consecutively, the number including the total number of pages. For example 4/21,
4 of 21, fourth page of a total of 21 pages.
The following sequence of paragraph headings is suggested. These depend on the type of
structure and load conditions, but they should reflect the logical sequence of gathering of
information and its subsequent use:
1. Codes, references, and general requirements
1.1 Codes
a) AS3600 - Concrete Structures
b )
1.2 References
1.3 General Requirements
a) Concrete Strength
b )
Cover Requirements
(Include a brief description of the structure, sketches, and a marking plan)
3.1 Dead Loads
3.2 Live Loads
Computation of Design Actions
(Load combinations, design loads, BMDs, SFD, etc.)
Girders in bending
Positive Bending design (midspan)
Negative bending design (over central support)
Shear Design (at distance do left and right of central column)
Shear Design (at distance do from supports 1 & 3)
Column Design
Central column
Edge Column
You should form yourselves into groups of two.
There should be a single submission (one report) per group as per above format.
The deadline for the submission is 23:59 Friday 21st September. 2018
This project accounts for 20% of the total subject assessment.
Swinburne University of Technology
Page 3

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