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Seismic performance improvement of tension-only-braced frames with Energy-Dissipative Rocking Columns
Highlights A novel system of steel Energy-Dissipative Rocking Column (EDRC) is proposed. A simplified model of BTF-EDRC system is established using OpenSees for BTFs and EDRCs. The key factors, including EDRC stiffness ratio and bending stiffness of column branch in EDRC, on response under strong earthquakes are investigated. A rational range of EDRC stiffness ratios no more than 0.4 is recommended for BTF-EDRC systems.
Abstract Steel braced frames consisting of strong beams, weak columns, and tension-only braces (BTFs) have been extensively used in low-rise steel buildings, since it is prefabricated rapidly and is cost-efficient. However, BTFs are vulnerable to soft story failure due to the negligible post-yielding stiffness of tension-only braces. A novel device of Energy-Dissipative Rocking Column (EDRC) is proposed to improve the seismic performance of BTFs. An EDRC consists of dual hinge supported steel column branches and replaceable steel strip dampers between them. Firstly, the effectiveness of EDRCs were verified through nonlinear time history analyses on benchmark multi-story BTFs using a suite of far-field ground motion records. Secondly, systematic parametric studies are conducted to quantify the effect of key influencing factors such as stiffness ratio of EDRC to BTF and bending stiffness of column branches on the seismic performance improvement of BTF-EDRC systems. The results show that the maximum inter-story drift and inter-story drift concentration under earthquakes as well as the residual drift after earthquakes can be significantly mitigated by coupling with EDRC. It is found that the maximum inter-story drift ratio can be reduced by 50% when the stiffness ratio of EDRC to BTF reached 1.0. The most effective stiffness ratio of EDRC to BTF for mitigating the inter-story drift concentration and residual drift ratio falls in a range of no more than 0.2 and 0.4, respectively.
Seismic performance improvement of tension-only-braced frames with Energy-Dissipative Rocking Columns
Highlights A novel system of steel Energy-Dissipative Rocking Column (EDRC) is proposed. A simplified model of BTF-EDRC system is established using OpenSees for BTFs and EDRCs. The key factors, including EDRC stiffness ratio and bending stiffness of column branch in EDRC, on response under strong earthquakes are investigated. A rational range of EDRC stiffness ratios no more than 0.4 is recommended for BTF-EDRC systems.
Abstract Steel braced frames consisting of strong beams, weak columns, and tension-only braces (BTFs) have been extensively used in low-rise steel buildings, since it is prefabricated rapidly and is cost-efficient. However, BTFs are vulnerable to soft story failure due to the negligible post-yielding stiffness of tension-only braces. A novel device of Energy-Dissipative Rocking Column (EDRC) is proposed to improve the seismic performance of BTFs. An EDRC consists of dual hinge supported steel column branches and replaceable steel strip dampers between them. Firstly, the effectiveness of EDRCs were verified through nonlinear time history analyses on benchmark multi-story BTFs using a suite of far-field ground motion records. Secondly, systematic parametric studies are conducted to quantify the effect of key influencing factors such as stiffness ratio of EDRC to BTF and bending stiffness of column branches on the seismic performance improvement of BTF-EDRC systems. The results show that the maximum inter-story drift and inter-story drift concentration under earthquakes as well as the residual drift after earthquakes can be significantly mitigated by coupling with EDRC. It is found that the maximum inter-story drift ratio can be reduced by 50% when the stiffness ratio of EDRC to BTF reached 1.0. The most effective stiffness ratio of EDRC to BTF for mitigating the inter-story drift concentration and residual drift ratio falls in a range of no more than 0.2 and 0.4, respectively.
Seismic performance improvement of tension-only-braced frames with Energy-Dissipative Rocking Columns
Li, Yan-Wen (author) / Li, Guo-Qiang (author) / Jiang, Jian (author) / Wang, Yan-Bo (author)
Engineering Structures ; 196
2019-06-07
Article (Journal)
Electronic Resource
English
Seismic design for enhanced building performance using rocking steel braced frames
| Online Contents | 2015