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Experimental and Numerical Investigation of Strongback Braced Frame System to Mitigate Weak Story Behavior
| 题名： | Experimental and Numerical Investigation of Strongback Braced Frame System to Mitigate Weak Story Behavior |
| 其他题名： | Aiken,I.D.,and Kelly,J.M.(1990)."Earthquake simulator testing and analytical studies of two energy-absorbing systems for multistory structures."Rep.No.UCB/EERC-90-03,Earthquake Engineering Research Center,Univ.of California,Berkeley,CA. |
| 正文语种： | 英文 |
| 作者： | Barbara G. Simpson |
| 关键词： | Earthquake-resistant design;Steel braced frames;Inelastic behavior;Buckling-restrained braces;Seismic retrofit; Full-scale tests; Seismic effects |
| 摘要： | Multistory steel braced frames tend to concentrate damage in a few weak stories in response to severe earthquake shaking. This paper presents the numerical and experimental results for a strongback system, a modification of the conventional braced frame that uses an essentially elastic truss that vertically spans the structure's height to delay or prevent weak-story behavior. A cyclic test is performed on a nearly full-scale two-story specimen in which the strongback is introduced as a seismic retrofit of an existing vintage-era concentrically braced frame. The retrofit design is composed of two halves: an inelastic truss using a buckling-restrained brace (BRB) to dissipate seismic input energy and an elastic vertical truss designed to control weak-story behavior. The strongback specimen prevented formation of a weakstory mechanism and mobilized the reserve strength of other structural components, even after the core of the BRB ruptured. Test results establish that the strongback system can be a successful method of mitigating weak-story behavior. A simple numerical model incorporating a low-cycle fatigue material is able to predict the global response of the frame, including the rupture of the BRB. |
| 出版年： | 2018 |
| 论文唯一标识： | P-26Y2018V144N02031 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/(ASCE)ST.1943-541X.0001960 |
| 期刊名称： | Journal of Structural Engineering |
| 拼音刊名(出版物代码)： | P-26 |
| 卷： | 144 |
| 期： | 02 |
| 页码： | 364-377 |
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