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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 39149 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Maleki, Shervin
- Abstract:
- The AASHTO Standard Specification defines diaphragms as a transverse member between girders in order to maintain sectional geometry. Some of the reasons in favor of using a diaphragm are that it prevents the girders from twisting during the process of construction and helps in distributing vertical live loads between girders and transfers lateral loads (wind or earthquake) to supports. It also provides restraint for the lateral-torsional buckling of the girders. While diaphragms at the ends of bridges are called end diaphragms, the diaphragms away from the bridge ends are called intermediate diaphragms. These members are usually made of steel or cast-in-place concrete. Based on their behavior they can be classified as bracing or flexural diaphragms. End diaphragms provide an important load path for the seismically induced loads, since seismic forces at the deck would have to pass through the end diaphragms to arrive at the top of bearing. Despite their important role in transferring seismic loads to the bearings and substructure, no extensive experimental and analytical researches have been conducted, concerning their seismic behavior. Consequently, detailed seismic design of end diaphragms have not been considered in bridge design codes. In order to design end diaphragms, the seismically induced forces have to be determined by means of a rational procedure and special consideration has to be given to their seismic behavior. As for steel diaphragms some researches have been conducted, but none has been published for reinforced concrete diaphragms, up to date. Therefore these members require further attention and more researche has to be carried out in this field. In this thesis the behavior of reinforced concrete end diaphragm in single-span slab-girder bridges has been investigated using the SAP2000 program and a three-dimensional finite element model. In order to achieve this goal, linear and nonlinear time history analyses of straight slab-girder bridges, with and without skew, under earthquakes with different frequency contents have been performed. Both pinned and elastomeric bearings are considered. Span lengths of 10m, 20m and 30m and skew angles of 0 to 60 degrees, with an increment of 15 degrees, are used.
- Keywords:
- Bridges ; Seismic Analysis ; Seismic Behavior ; Support Diaphragm ; Bridges Diaphragms ;
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