Pseudo-Dynamic Test for a Self-centering Prefabricated Steel Frame with Semi-rigid Column Base
In order to solve the problem that large plastic deformation may occur at the bottom column of self-centering prefabricated steel frame structure with rigid column base under precautionary earthquake or rare earthquake,a self-centering prefabricated steel frame structure with semi-rigid column base was designed.The pseudo-dynamic test was conducted on the substructure of the designed frame to compare the joint openings,energy dissipation capacity,stiffness degradation,prestress loss and strain changes of the frame under different levels of earthquakes with Taft,LOS000,and El-Centro waves.The test results show that the steel frame has good self-centering function and energy dissipation capacity under rare earthquake.The average prestress loss is only 1.58%at most,indicating that the application of prestress method in steel strands is reliable.The column base of the steel frame can remain elastic state,so that only the steel beam needs to be repaired after the earthquake,greatly reducing the repair cost.
semi-rigid column basesteel framepseudo-dynamic testself-centering functionprestress loss
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