Development of bridge girder movement criteria for accelerated bridge construction.

Details

• Creators:
  Chen, Genda ; Bao, Yi
• Corporate Creators:
  Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
• Corporate Contributors:
  United States. Dept. of Transportation. Research and Innovative Technology Administration
• Subject/TRT Terms:
  • Girder bridges
  • Diaphragms (Engineering)
  • Earthquake resistant design
  • Bridge construction
  • Finite element method
  • Bridge superstructures
  • Transverse strength
  • Bridge design
  • Mathematical models
• Publication/ Report Number:
  NUTC R316 ; Project #00040815
• Resource Type:
  Tech Report
• Geographical Coverage:
  Missouri
• Corporate Publisher:
  Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
• Abstract:
  End diaphragms connect multiple girders to form a bridge superstructure system for effective resistance to earthquake loads. Concrete ; girder bridges that include end diaphragms consistently proved to perform well during previous earthquake events. However, whether ; concrete bridges without end diaphragms are definitively inadequate in seismic performance is yet to be answered. The 2010 Chile ; Earthquake indicated that properly designed bridge girders and their lateral movement stoppers (shear keys) may perform equally well ; with those with end diaphragms. In this report, a feasibility study on the design of girder bridges without end diaphragms is presented. ; This study is particularly significant in the context of accelerate bridge construction since concrete diaphragms are often cast in place ; and eliminating them can save field erection time and cost. The key to make the no-diaphragm concept work is to understand how ; multiple girders can work together during a transverse earthquake excitation without breaking the girders and bridge deck. ; Specifically, a three-dimensional finite element model of a representative concrete girder bridge with and without end diaphragms is ; established and analyzed to understand the effects of various design parameters (e.g. diaphragm height, diaphragm thickness, the ; coefficient of friction between girders and their supporting elements, the number and size of shear keys) on transverse girder ; movement capacity. Numerical results indicate that properly designed end diaphragms can increase the transverse capacity of a bridge ; by making individual girders work together but can be substituted by shear keys placed between the strengthened girders. In doing so, ; both transverse capacity and stiffness of the bridge superstructure can be significantly increased. Shear keys are more reliable than the ; friction mechanism. In particular, movable shear keys are more effective in distributing loads among multiple girders.
  More +
• Format:
  PDF
• Funding:
  DTRT06-G-0014
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27952/dot_27952_DS1.pdf
• File Type:
  [PDF - 8.75 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:2ec75b3cc6904f360a8df2a8401cab87466a981f6331f84efe0513b66880a221