Proposed Modification to AASHTO Cross-Frame Analysis and Design (2021) / Chapter Skim
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From page 4... ...
4 Background 1.1 Problem Statement and Current Knowledge Cross-frames serve many roles throughout the construction and service life of steel I-girder bridges. A major function of cross-frames is to serve as stability braces to enhance the lateral- torsional buckling (LTB)
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From page 5... ...
Background 5 As structural analysis tools and bridge design practices advanced in the following years, updates to the cross-frame analysis and design procedures became increasingly necessary. This process was initiated in the 1st Edition of the American Association of State Highway and Transportation Officials LRFD Bridge Design Specifications (1994)
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6 Proposed Modification to AASHTO Cross-Frame Analysis and Design connection effects. While these concepts show promise, neither has been widely adopted in the steel bridge design and construction industry.
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Background 7 the current fatigue loading model (i.e., AASHTO LRFD Articles 3.4.1, 3.6.1.4, and 6.6.1.2.1) for cross-frame analysis and design, as further outlined in Section 1.2.
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8 Proposed Modification to AASHTO Cross-Frame Analysis and Design the Marcy Pedestrian Bridge. Although the Marcy Pedestrian Bridge was a steel tub girder, the LTB failure is similar to the system buckling mode for which many narrow I-girder systems are susceptible.
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Background 9 c. Additional guidance on how to evaluate the influence of end connections on cross-frame member stiffness in refined analysis models; d.
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10 Proposed Modification to AASHTO Cross-Frame Analysis and Design • [Stability bracing – Article N/A] Can the AISC design guidelines for stability bracing be incorporated into AASHTO LRFD?
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From page 11... ...
Background 11 Chapters 2 and 3 of the main report are not intended to be comprehensive in nature. Rather than overwhelm the reader with the full set of experimental and analytical data, sample results are selectively presented to provide the proper context to the major conclusions summarized in Chapter 4.
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