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| The Effect of Strain Hardening and Cross Section Shape on Post Yield Behavior of Steel Box Girder Bridge |
Muttaqin Hasan, Mochammad Afifuddin, Muhammad Jamil, Yuslinda
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Abstract:
The purpose of this study is to analyze the post yield behavior of 4 different types of box girder cross sections. In order to see the effect of strain hardening, bilinear stress-strain curve and stress-strain curve with strain hardening were used. The studied parameters were moment-curvature relationships, plastic moments, inelastic region lengths, and shape factors. The analyzed bridge has the span length of 40 meters and width of 10 meters. All cross sections were designed to have the same yield moment. For analysis with bilinear model, the higher plastic moment was reached at multiple box section while the lower plastic moment was reached at single box section. For analysis with strain hardening model, the higher plastic moment was reached at twin box section while the lower plastic moment was reached at single box section. The higher increase of plastic moment due to strain hardening was reached at single box section, which was 33.5% increasing, while the lower increase of plastic moment was reached at multiple box section, which was 25.8% increasing. The average increase of plastic moment due to strain hardening for all analyzed cross-sections was 29.1%. The higher increase of inelastic region length due to strain hardening was reached at single box section, which was 4 times increasing. The moment-curvature relationships for all cross sections with and without strain hardening were compared.
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