Paper Infomation
Experimental Study on Seismic Behavior of Seismic-damaged Lateral Joints in Composite Frame Consisting of CFSST Columns and Steel Beams Strengthened with Enclosed Reinforced Concrete
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Author: Chengxiang Xu, Li Zhou, Kailong Xu, Wei Peng
Abstract: A new composite strengthening method of seismic-damaged lateral joints in composite frame consisting of Concrete-Filled Square Steel Tubes (CFSST) columns and steel beams strengthened with enclosed Reinforced Concrete (RC) at the ends of columns and welding steel plates at the ends of beams was presented. Based on the current design specifications, one half scaled models of 4 lateral joints in composite frame consisting of CFSST columns and steel beams were designed and manufactured. One model was original control specimen, one was strengthened by enclosed RC, and the others were strengthened after pre-damage. The destruction tests under lateral cyclic load on the models were carried. The effectiveness of seismic-damaged joints strengthened with enclosed RC and the reinforcement effect on different levels of seismic damage were studied. The test results show that seismic- damaged joints in composite frame consisting of CFSST columns and steel beams strengthened with enclosed RC meets the strong column-weak beam joints requirement of seismic design, and the failure modes are of all joints are the bending failure of steel beam. The reinforcement with enclosed RC has a significant on increasing the ultimate capacity and the seismic behaviors of joints. The study indicated the rehabilitated joints recover the level of their original seismic performances before seismic damage in a certain extent damage level. Based on the test data, namely the ultimate capacity, limit displacement, ductility, the energy consumption coefficient, limit displacementthe strengthening method of seismic-damaged joints by strengthened with enclosed RC is an effective method for seismic strengthening.
Keywords: Frame Joint with Concrete-Filled Square Steel Tube (CFSST)-Steel Beam; Strengthening with Enclosed Reinforced Concrete (RC); Quasi-Static Test, Seismic Damage; Seismic Behavior
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