Seismic strengthening design of moment-resisting steel frames in a Sichuan region
In order to evaluate the post-strengthening performance of a bending steel frame under the upgrade of seismic fortification intensity,a three-story steel frame teaching building in Wenchuan region was selected as the prototype structure.Two retrofitted methods including the retrofitting by the two-connected corrugated steel plate shear walls(CSPSW)and the two-connected buckling-restrained corrugated steel shear walls(BR-CSPSW)were used to enhance the seismic behavior of the steel frame building.The refined finite element model of steel frame structure before and after retrofit was established by ABAQUS program,and the monotonic and cyclic Pushover analysis were carried out by using the inverted triangle horizontal load distribution mode.The results showed that the employment of the two-connected CSPSW and BR-CSPSW could obviously improve the lateral bearing capac-ity,lateral stiffness and energy dissipation capacity of steel frame.Compared with the retrofitting by two-connected CSPSW,the use of two-connected BR-CSPSW could improve the rapid deterioration of its post-buckling bearing capacity,and obtain a more stable lateral resistance.Therefore,the retrofitting method of two-connected BR-CSPSW is recommended for steel or concrete frame.
steel framecorrugated steel plate shear wall(CSPSW)seismic strengthening designfinite element
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