Cross-frame connection details for skewed steel bridges.

Details

• Alternative Title:
  Project title: Cross-frame and diaphragm layout and connection details
• Creators:
  Quadrato, Craig ; Wang, Weihua ; Battistini, Anthony ; Wahr, Andrew ; Helwig, Todd ; Frank, Karl ; Engelhardt, Michael
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office
• Subject/TRT Terms:
  • Steel bridges
  • Metal bridges
  • Skewed structures
  • Bridge construction
  • Girders
  • Diaphragms (Engineering)
  • Iron and steel bridges--Design and construction
  • Girders--Design and construction
  • Diaphragms (Structural engineering)--Design and construction
• Publication/ Report Number:
  FHWA/TX-11/0-5701-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Aug. 2008-Aug. 2010.
• Corporate Publisher:
  University of Texas at Austin. Center for Transportation Research
• Abstract:
  This report documents a research investigation on connection details and bracing layouts for stability ; bracing of steel bridges with skewed supports. Cross-frames and diaphragms play an important role in stabilizing ; steel girders, particularly during construction. The commonly used bent plate connection between skewed braces and ; steel girders can introduce flexibility that can have detrimental effects on the bracing behavior. An alternative detail ; investigated in this study is a split pipe stiffener used to connect cross-frames to girders at a skew. The split pipe ; stiffener allows perpendicular connections to the cross-frame connection tab, regardless of the skew angle. The split ; pipe provides a stiffer connection between the cross-frame and the girder. More importantly, the split pipe stiffener ; increases the torsional stiffness of the girder by introducing substantial warping restraint. This increases the lateral ; torsional buckling capacity of the girder and allows the first line of intermediate cross-frames to be moved farther ; from the support. Overall, the increase in girder torsional stiffness and buckling capacity that results from the use of ; the split pipe stiffener will enhance the safety of the girder at all stages of construction: during transportation, lifting, ; erection, and placement of the concrete deck. This study also examined layout patterns for intermediate cross-frames ; in skewed bridges. Results showed that staggering the intermediate cross-frames reduces live load induced forces in ; the cross-frame members and mitigates the potential for associated fatigue cracking. This report also provides design ; recommendations for the split pipe stiffener and provides a procedure for computing the buckling capacity of girders ; with split pipe stiffeners.
  More +
• Format:
  PDF
• Funding:
  0-5701
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/22656/dot_22656_DS1.pdf
• File Type:
  [PDF - 15.02 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:2fda28ec4e802fea8f3bb778ca6ac46107dbf0f2a5f020972404f246710d33d912542b0d247ae3a1b767278887597e284326b13bd1d4ac7b714db14646b82925