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Homework answers / question archive / You will be designing an enclosed two-span, steel pedestrian truss bridge in any New England city of your choosing

You will be designing an enclosed two-span, steel pedestrian truss bridge in any New England city of your choosing

Civil Engineering

You will be designing an enclosed two-span, steel pedestrian truss bridge in any New England city of your
choosing. Your tasks are as follows:
:4 — :
1. Location and Structure Geometry:

a. Choose two buildings you would like to connect and, using Google Maps (or similar)
approximately scale the distance between them. Your selected buildings must be at least
4Sft apart.

b. For your bridge to be two-span, you will need to place a support column somewhere along
its length. For this project, place your support column directly in the middle of the span
between your buildings.

c. For the purposes of this project, your total bridge length (both spans together) should not
exceed 100ft and the width of your bridge should not exceed 15ft. The overall depth of a
truss in your bridge should not be greater than 15ft.

d. The bridge should be placed between 15ft and 30ft above the ground.

2. Loading:

a. Assume the pedestrian bridge is Risk Category III.

b. Determine the flat roof snow load that should be applied to the roof of your structure
using the ASCE 7-10 standard.

c. Assume the bridge carries a live load of 150psf.

d. Assume the bride carries a uniform dead load composed of:

i. Self-weight of structural components = 10psf
ii. Self-weight of enclosure panels/glass = 30psf
iii, Self-weight of MEP = 10psf

e. Assume all the load (dead, live, and snow) is uniformly applied across the whole structure
in plan and evenly distributed to each of the bottom panel points of the trusses (where
members intersect).

3. Structural Design:

a. Using statics, determine the support reactions at each end of your truss(es). You may
assume they are simply supported with rollers placed over the central support column.

i. Using the total reactions at the central support, size a column assuming it is a
vertical cantilever (fixed at one end, free on the other). Your column may have a
square or circular cross-section.

b. Using the method of joints or sections, determine the member forces in your truss(es).

i. Based on your above calculated demand, determine the required area and
moment of inertias for your bottom chord, top chord, and diagonal members (you
may assume your members are either square or rectangular in cross-section and
comprised of A992 steel with a yield stress of 50ksi and a modulus of elasticity of
29,000ksi. Use a factor of safety of 2.0).

4. Aesthetics:

a. Proportion your truss to be both structurally efficient and aesthetically appealing.

b. If you wish, you may produce drawings, renderings, or 3D models of your bridge including
your chosen cladding, roofing, etc. for extra credit worth up to 5% additional to your
overall final project grade.

5. Deliverable:

a. Your project should be delivered in the form of a very brief summary report and a
calculation package.

i. The report should include:

* Amap or satellite image highlighting the buildings between which your
bridge spans (please provide the name and state of your chosen city)

* =6Anelevation and plan view of your designed bridge and central support
column with the final member sizes and all pertinent dimensions labeled

* ~=Any images or drawings as described in the aesthetics section above

ii. The calculation package should include:

*® Snow load development per ASCE 7-10

* Determination of your controlling load combination and load per panel
point as per the above loading section

© =A free-body diagram of your truss(es) showing external forces, member
and joint nomenclature, reactions, and pertinent dimensions

* Calculations determining the reactions at bridge support conditions

*® Calculations determining a minimum column size at the central support

*® ALL worked calculations for each internal beam force either by method
of joints or sections (state whether tension or compression results / draw
any pertinent diagrams / be clear, concise, and neat)

© Final truss diagram(s) showing member forces, tension/compression, and
the minimum member sizes required

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