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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 54576 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Maleki, Shervin
- Abstract:
- Nowadays, using perimeter steel moment frames in combination with interior gravity frames have become common practice in structural building design. One of the key benefits of this system is the open space that it provides for the architects. In active seismic regions, special details are required in the design of the seismic force resisting systems to make these frames ductile. However, these details cause excessive displacement for the gravity force resisting system. Although the gravity frames are not designed to endure seismic forces, they collaborate in the system’s response as they are connected to the same floor diaphragm and withstand lateral displacements. Therefore, these systems suffer severe damages in intense earthquakes. To this end, the design codes have mandated using a specific clause namely Deformation Compatibility. This clause states that gravity force resisting systems should be able to endure inelastic lateral displacement forces in addition to gravitational ones. The only accurate way to obtain the seismic demand of gravity frames is to use the nonlinear time history method. However, this method is very time consuming and has a high computational cost for conventional buildings and therefore, not widely used in practice. To solve this problem, engineers use a conventional method, the description of which is given in the manuscript. In this research, first, the conventional method is reviewed. And then a new proposed method is suggested. And finally these two methods are compared with the nonlinear time history analyses. It is observed that the conventional method obtains the seismic forces of gravitational frames much less than the nonlinear time history method and about one tenth of it. But, the proposed method of this research has been able to obtain the seismic forces of gravitational frames with reasonable conservatism compared to the nonlinear time history method.For the purpose of this research, three building models with 3, 9, and 20 stories were used. These were representatives for low-rise, medium-rise, and high-rise buildings, respectively
- Keywords:
- Steel Special Moment Frame ; Nonlinear Time History Analysis ; Seismic Forces ; Deformation Compatibility ; Gravity Force Resisting System ; Seismic Force Resisting System
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