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Steel and Composite Structures Volume 40, Number 3, August10 2021 , pages 369-387 DOI: https://doi.org/10.12989/scs.2021.40.3.369 |
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Energy factor of high-strength-steel frames with energy dissipation bays under repeated near-field earthquakes |
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Ke Ke, Michael CH Yam, Xuhong Zhou, Fuming Wang and Fei Xu
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| Abstract | ||
| This investigation contributes to quantification of the inelastic seismic demands for high strength steel moment resisting frames equipped with energy dissipation bays (HSSF-EDBs) subjected to seismic sequences composed of repeated near-field ground motions. The emphasis is placed on the energy factor demand. A statistical examination of a database with more than eighty million energy factor demands of single-degree-of-freedom (SDOF) oscillators representing HSSF-EDBs responding in different yielding stages is conducted. The research findings show that in the damage-control stage, the energy factor which quantifies the peak seismic demand of a HSSF-EDB structure is insensitive to the repeated near-field earthquake motions. In contrast, a remarkable elevation of the energy factor is observed when oscillators characterising HSSF-EDBs progress into the ultimate stage. In addition, an increasing post-yielding stiffness ratio of the nonlinear force-displacement response in the damage-control stage may produce a detrimental effect on HSSF-EDBs progressing into the ultimate stage under repeated near-field earthquakes due to the corresponding evident increase of seismic demands. A nonlinear regression model quantifying the mean energy factor demand of the system under repeated near-field earthquake motions is proposed to facilitate performance-based seismic design of HSSF-EDBs. | ||
| Key Words | ||
| energy balance; energy dissipation bay; high strength steel; inelastic seismic demands; repeated near-field earthquake | ||
| Address | ||
| Ke Ke, Xuhong Zhou and Fei Xu: Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, China; School of Civil Engineering, Chongqing University, Chongqing, China Michael CH Yam: Department of Building and Real Estate, The Hong Kong Polytechnic University, Hong Kong, China; Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch), The Hong Kong Polytechnic University, Hong Kong, China Fuming Wang: Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, China | ||