Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Structural Engineering and Mechanics Volume 56, Number 4, November25 2015 , pages 569-588 DOI: https://doi.org/10.12989/sem.2015.56.4.569 |
|
|
|
A methodology for design of metallic dampers in retrofit of earthquake-damaged frame |
||
Chao Zhang, Yun Zhou, Da G. Weng, De H. Lu and Cong X. Wu
|
||
| Abstract | ||
| A comprehensive methodology is proposed for design of metallic dampers in seismic retrofit of earthquake-damaged frame structures. It is assumed that the metallic dampers remain elastic and only provide stiffness during frequent earthquake (i.e., earthquake with a 63% probability of exceedance in 50-year service period), while in precautionary earthquake (i.e., earthquake with a 10% probability of exceedance in 50-year service period), the metallic dampers yield before the main frame and dissipate most of the seismic energy to either prevent or minimize structural damages. Therefore by converting multi-story frame to an equivalent single-degree-of-freedom system, the added stiffness provided by metallic dampers is designed to control elastic story drifts within code-based demand under frequent earthquake, and the added damping with the combination of added stiffness influences is obtained to control structural stress within performance-based target under precautionary earthquake. With the equivalent added damping ratio, the expected damping forces provided by metallic dampers can be calculated to carry out the configuration and design of metallic dampers along with supporting braces. Based on a detailed example for retrofit of an earthquake-damaged reinforced concrete frame by using metallic dampers, the proposed design procedure is demonstrated to be simple and practical, which can not only meet current China | ||
| Key Words | ||
| metallic damper; seismic retrofit; earthquake-damaged frame; energy; equivalent damping ratio | ||
| Address | ||
| Chao Zhang: Postdoctoral Research Station of Civil Engineering, Guangzhou University, Guangzhou, China Chao Zhang, Yun Zhou, De H. Lu and Cong X. Wu: College of Civil Engineering, Guangzhou University, Guangzhou, China Da G. Weng: State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China | ||