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Example 3.2 Design of a Composite Interior Steel Stringer

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Bridge Engineering

Example 3.2 Design of a Composite Interior Steel Stringer

Ho-Kyung Kim, Professor Dept. of Civil & Environmental Eng.

Seoul National University

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▶ See 3.10.2 @P165 for Unshored Construction.

▶ ADTT: Averaged Daily Truck Traffic

▶ See 3.10.3 @P165 for Effective Flange Width.

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▶ Girder weight is assumed at this moment, and will be updated by exact value.

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▶ Superimposed dead loads are those loads placed on the

bridge after the deck has cured.

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▶ For a simply supported bridge, a range of 1/20 to 1/27 of the span length is normally used as the depth of the stringer.

▶ See 3.8@P132 for Distribution Factor.

▶ See 3.10.4@P167 for modular ratio n.

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▶ Homework#3.1 for the

maximum live load moment.

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▶ Confirm the maximum moment and shear for tandem load by yourself.

▶ See slide #11 for design lane load in PPT for Design Loads and Combinations.

▶ See slide #13 for dynamic load allowance in PPT for Design Loads and Combinations.

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DC1 DC2 DW

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▶ See lecture note P99-104 and P108 for the flexural and shear strengths of composite slab-on- stringer deck.

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Transverse Stiffeners and Shear-Dominant Failure mode of Web

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Vertical Stiffeners, Longitudinal Stiffeners, and Bearing Stiffeners

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For k, see 3.10.5@P168.

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▶ See slide #19 for the fatigue

load in PPT for Design Loads and Combinations.

▶ See slide #13 for the impact factor for fatigue load in PPT for Design Loads and Combinations.

▶ See slide #21 for the impact factor for fatigue load in PPT for Design Loads and Combinations.

▶ The spacing of the two 32 kip axle loads should be 30ft.

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▶ See pp.109-111 in the Lecture Note for the design of shear connectors.

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▶ 𝐸!= 29,000 ksi (200GPa).

▶ For normal weight concrete (approximately 0.145 kcf) 𝐸"= 1,820 𝑓"#

▶ If the actual unit weight of concrete used is known, 𝐸"= 33,000𝑤$.& 𝑓"#

▶ The ultimate strength may also be obtained form Table

3.6@P197.

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THANK YOU

for your attention!

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