Anti-seismic Behavior Research Of Joints Of Special-shaped Column Frame With Decentralized Steel Bar From Beam Under Cyclic Loading

Anti-seismic behavior of special-shaped section column joints is one of key questions which need to be solved in earthquake zone, how to resolute excessive reinforcement bars, difficult construction, difficult to quality of special-shaped section column joints is one of main questions. The paper bring forward to use special-shaped section column joints with decentralized reinforcement steel from beam which can solve some engineering problems which can ensure configuration , convenient construction and behavior of core effectively . therefore, the subject have important theoretic signification and practical value. This paper have carried out the following research works:The under cyclic load tests of three groups of special-shaped column frame joints including top floor exterior joint, interior joint and knee joint have been conducted. On the basis of the experimental data collected in variant steps of the test about the core concrete reinforcement steel bars of joints and the deformation of the beam. This paper analysis the anti-seismic behavior of special-shaped section column joints with decentralized reinforcement steel from beam. The following problems have been analyzed: failure form of joints, rupture load, crack load, hysteretic behavior, ductility, energy dissipation and shear deformation of the core concrete of joint etc.Nonlinear finite element analysis of joint of decentralized reinforcement steel from beam under the cyclic load have been conducted by means of ADINA software. On the basis of analysis data of 17 models, This paper analyzed deformation, load capability, stress and strain etc. and brought forward the proportion of the decentralized steel bars and decentralized distribution in the slab.Distribution range of decentralized steel bars from beam to slab has been discussed. 12 calculation models of three series are designed, including 4 L-shaped, 4 T-shaped and +-shaped section column joints. Stress-strain of rebar has been analyzed in according to these models, and suggestion of Distribution range and proportion of decentralized reinforcement steel from beam has been given.THROUGH THE SYSTEM RESEARCH ON THREE ASPECTS, INNOVATIONAL ACHIEVEMENTS HAVE BEEN ACHIEVED IN SPECIAL-SECTION COLUMN FRAME SYSTEM.