Master of Science / Department of Architectural Engineering / Kimberly Waggle Kramer / Braced frames are a common seismic lateral force resisting system used in steel
structures. Ordinary concentric braced frames (OCBFs) and special concentric braced frames
(SCBFs) are two major types of frames. Brace layouts vary for both OCBFs and SCBFs. This
report examines the inverted-V brace layout which is one common arrangement. OCBFs are
designed to remain in the elastic range during the design extreme seismic event. As a result,
OCBFs have relatively few special requirements for design. SCBFs are designed to enter the
inelastic range during the design extreme seismic event while remaining elastic during minor
earthquakes and in resisting wind loads. To achieve this, SCBFs must meet a variety of stringent
design and detailing requirements to ensure robust seismic performance characterized by high
levels of ductility.
The design of steel seismic force resisting systems must comply with the requirements of
the American Institute of Steel Construction’s (AISC) Seismic Provisions for Structural Steel
Buildings. Seismic loads are determined in accordance with the American Society of Engineers
Minimum Design Loads for Buildings and Other Structures. Seismic loads are very difficult to
predict as is the behavior of structures during a large seismic event. However, a properly
designed and detailed steel structure can safely withstand the effects of an earthquake.
This report examines a two-story office building in a region of moderately high seismic
activity. The building is designed using OCBFs and SCBFs. This report presents the designs of
both systems including the calculation of loads, the design of frame members, and the design and
detailing of the connections. The purpose of this report is to examine the differences in design
and detailing for the two braced frame systems.
| Identifer | oai:union.ndltd.org:KSU/oai:krex.k-state.edu:2097/14986 |
| Date | January 1900 |
| Creators | Grusenmeyer, Eric |
| Publisher | Kansas State University |
| Source Sets | K-State Research Exchange |
| Language | en_US |
| Detected Language | English |
| Type | Report |
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