Pushover analysis of modularized prefabricated column-tree steel frame

A prefabricated steel frame with Z-shaped cantilever beam splicing is proposed, which can realize a good seismic performance through the slip of the splice. The moment-rotation relationship model of the splice is constructed through force analysis about various states of loading process of splice. A simulation method utilizing connecting element of ABAQUS to realize the constitutive relation of the splice in the overall structure is proposed. Then modal analysis and pushover analysis are conducted on the modularized prefabricated column-tree steel frame and rigid frame under the same condition, and the result shows that there is a very small difference of the natural periods of vibration of the two frames and the performance points under seismic action. The column-tree frame can dissipate seismic energy by utilizing slip of the splice, and compared with the rigid frame, the column-tree frame achieves the purpose of multiaspect seismic fortification.