Interactive Sample Project: Pedestrian Bridge

Step 2: Materials Selection

Bridge Deck

The bridge deck will be made of 2x4 pressure treated lumber

Bridge Beams

Choose the material of the bridge beams

Material	Elastic Modulus, E (ksi)	Elastic Strength (ksi), σ_y (steel) or F_b (wood)	Specific Weight γ (lb/in³)	Relative Cost per Pound ($)
Steel A36 [2]	29000	36	.284	1
Southern Pine, DNS Select Structural [3]	1900	3.05	.015	.32
Douglas Fir Larch, Select Structural [3]	1900	1.45	.017	.312

In this example, where the beam length is small and the loading is light, steel will not be considered.

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This material is based upon work supported by the National Science Foundation under Grant No. 0633602. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).

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