Design considerations for shear links in eccentrically braced frames
Malley, James O.; Popov, Egor P.
UCB/EERC-83/24, Earthquake Engineering Research Center, University of California, Berkeley, 1983-11, 126 pages (530/M224/1983)
This study addresses three aspects of shear link behavior critical to the economical design of an eccentrically braced frame which employs shear links: the sensitivity of link behavior to the imposed loading history, the link-column connection detail, and the web stiffener design and details. Results for twelve full-size shear link specimens are presented. Each of the specimens was designed to investigate specific shear link response characteristics. Four specimens were tested with stiffener details which differed significantly from those of previous experiments and early design applications. Another set of four specimens were designed and tested with widely varying loading histories. A set of four specimens which employed conventional moment resisting connection details were also tested. The qualitative and quantitative results of these experiments are compared and analyzed using energy dissipation capacity as a major parameter. Test conclusions and design recommendations are presented. A practical method for web stiffener design is developed which considers both the axial force and bending rigidity requirements which shear link web stiffeners must satisfy. An example of the method is given in an appendix. A design procedure for eccentrically braced frames which employ shear links is outlined, based on the major considerations of shear link design. This procedure includes recommendations on the determination of structural configuration, member sizes, link-connection details, and web stiffener sizes and details. The suggested connection and stiffener details are illustrated.
PDF 7.89 MB | RAR 6.59 MB
Structural steel bracing systems: behavior under cyclic loading
Popov, Egor P.; Takanashi, Koichi; Roeder, Charles W.
UCB/EERC-76/17, Earthquake Engineering Research Center, University of California, Berkeley, 1976-06, 81 pages (515/P65/1976)
A survey is made of existing literature on the performance of steel braced frame structures under cyclic excitations. Particular emphasis is placed on inelastic behavior under extreme credible excitations which may occur during a severe earthquake. The experimental and analytical studies of the behavior of an individual brace are described. The effect of the individual braces on the behavior of the entire structural system is then brought out. The behavior of a concentrically braced frame is discussed with respect to dynamic response to given excitations as well as its quasistatic hysteretic behavior under cyclic load. The advantages and limitations of the two possible approaches to design and correlations are indicated. The overall problem is very complex and has not been completely resolved, but a number of plausible design concepts have been advanced. These are reviewed in the report. Most of these are based on static methods of analysis and are intended to assure good dynamic performance of the structure. These approaches are not a substitute for dynamic analysis, but they help simplify the design procedure. Several design concepts, such as the eccentrically connected braced frame, show that braced frames can perform well under extreme excitations. Finally, the limitations of current knowledge are summarized and recommendations for further research are made.
PDF 5.69 MB | RAR 4.33 MB
Malley, James O.; Popov, Egor P.
UCB/EERC-83/24, Earthquake Engineering Research Center, University of California, Berkeley, 1983-11, 126 pages (530/M224/1983)
This study addresses three aspects of shear link behavior critical to the economical design of an eccentrically braced frame which employs shear links: the sensitivity of link behavior to the imposed loading history, the link-column connection detail, and the web stiffener design and details. Results for twelve full-size shear link specimens are presented. Each of the specimens was designed to investigate specific shear link response characteristics. Four specimens were tested with stiffener details which differed significantly from those of previous experiments and early design applications. Another set of four specimens were designed and tested with widely varying loading histories. A set of four specimens which employed conventional moment resisting connection details were also tested. The qualitative and quantitative results of these experiments are compared and analyzed using energy dissipation capacity as a major parameter. Test conclusions and design recommendations are presented. A practical method for web stiffener design is developed which considers both the axial force and bending rigidity requirements which shear link web stiffeners must satisfy. An example of the method is given in an appendix. A design procedure for eccentrically braced frames which employ shear links is outlined, based on the major considerations of shear link design. This procedure includes recommendations on the determination of structural configuration, member sizes, link-connection details, and web stiffener sizes and details. The suggested connection and stiffener details are illustrated.
PDF 7.89 MB | RAR 6.59 MB
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Structural steel bracing systems: behavior under cyclic loading
Popov, Egor P.; Takanashi, Koichi; Roeder, Charles W.
UCB/EERC-76/17, Earthquake Engineering Research Center, University of California, Berkeley, 1976-06, 81 pages (515/P65/1976)
A survey is made of existing literature on the performance of steel braced frame structures under cyclic excitations. Particular emphasis is placed on inelastic behavior under extreme credible excitations which may occur during a severe earthquake. The experimental and analytical studies of the behavior of an individual brace are described. The effect of the individual braces on the behavior of the entire structural system is then brought out. The behavior of a concentrically braced frame is discussed with respect to dynamic response to given excitations as well as its quasistatic hysteretic behavior under cyclic load. The advantages and limitations of the two possible approaches to design and correlations are indicated. The overall problem is very complex and has not been completely resolved, but a number of plausible design concepts have been advanced. These are reviewed in the report. Most of these are based on static methods of analysis and are intended to assure good dynamic performance of the structure. These approaches are not a substitute for dynamic analysis, but they help simplify the design procedure. Several design concepts, such as the eccentrically connected braced frame, show that braced frames can perform well under extreme excitations. Finally, the limitations of current knowledge are summarized and recommendations for further research are made.
PDF 5.69 MB | RAR 4.33 MB
Code:
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Content of this section is hidden, You must be registered and activate your account to see this content. See this link to read how you can remove this limitation:
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