Introducing a new seismic resisting system with dual linked column frame and rocking motion

Abstract

This paper proposes a novel Dual-Linked Column Frame (DLCF) system with the rocking motion of moment frame column bases. The novel Dual-Linked Column Frame with Rocking motion (DLCFR) increases the seismic capacity of the moment frame and the linked beam as a structural fuse to dissipate energy. Rocking column bases can dissipate energy through fuses that can be repaired easily by being bolted to the column. A dual-linked column pattern in the frame center increases the seismic performance of the linked column frame (LCF) system. The effect of rocking motion on the seismic performance of LCF and DLCF systems has been evaluated by analyzing 13 models with different rocking motion placements and comparing these models with the fixed base condition. The seismic performance of the models has been compared and one model with the desirable seismic performance has been proposed. Incremental Dynamic Analysis (IDA) has been performed to examine the behavior of the 3, 6, and 9-story proposed models using OpenSees. The results showed that rocking motion reduces the failure of the moment frame in the DLCF system. The absorption of the base shear in the Moment Frame (MF) and the Linked Column (LC) in the DLCFR model is 1 and 99% of the total base shear, respectively. The probability of failure in the proposed models of 3, 6, and 9-story are 20%, 15%, and 10% less than the model with a fixed base, respectively. The new seismic system proposed has been able to significantly reduce the probability of failure, floor acceleration, and base shear.