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Christopher Higgins, PhD, PE Deanna Amneus, MS Student Laura Barker, MS Student December 6, 2012.

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Presentation on theme: "Christopher Higgins, PhD, PE Deanna Amneus, MS Student Laura Barker, MS Student December 6, 2012."— Presentation transcript:

1 Christopher Higgins, PhD, PE Deanna Amneus, MS Student Laura Barker, MS Student December 6, 2012

2 Many constructed in 1950s (Eisenhower Defense Highway System) Design standards have changed since built Loads more frequent and heavier Many are now cracked and deficient

3 Problem with poor details (reinforcing steel terminated in locations that show cracking) that can lead to member failure Many existing bridges with these reinforcing details cannot carry required truck loads by calculation Need new methods to strengthen these bridges Titanium looks promising: high strength, good stiffness match with adhesives, bendable and field adjustable, and durable. Material cost may not drive issue. Labor!

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6 (Modified from Higgins et al., 2004)

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9 Add External Reinforcing to strengthen beam

10 Saw-Cut slots in concrete Clean & Dry Epoxy placed in slots Insert external reinforcing in slots

11 1. Outer shell peeling 2. Slip of CFRP Titanium may eliminate these modes (with hooks)

12 1. Shear to length as for rebar 2. Cold bend with same radius as for steel rebar but overshoot to account for spring-back 3. Increase friction along surface to achieve better bond with epoxy


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