PARAMETRIC STUDY OF CES COMPOSITE COLUMNS WITH FRC USING FINITE ELEMENT ANALYSIS
Keywords:Fiber reinforcedconcrete, Concrete-encasedsteel, Finite element analysis, Composite column
To simplify and reduce the cost in construction works for SRC structures, the new composite structural systems consisting of only steel andconcrete, the concrete encasedsteel (CES) structures, have been developed. An experimental study on CEScolumnusing fiber reinforced concrete (FRC) panel has been carried out by one of the authors. In this paper, a 3D nonlinear finite element (FE) model is developed to study the response and predict the seismic performance of CES using FRC panel columns subjected to lateral cyclic loads. The column was modeled using solid elements and analyzed by using ANSYS APDL v.14. The model was validated with previous test results and was used as a reference for the parametric study. The parameters considered in the study was the tensile strength of FRC. The analytical results obtained from the FE analysis is able to accurately simulate the behavior of the CES columns on the experimental study. The CES column using full FRC is also modeled in order to know the influence of the full FRC on the CES composite column. Numerical results show that CES using FRC panel and CES using full FRC have an excellent seismic performance with a stable pinching and spindleshape hysteresis characteristic, respectively. Moreover, the results of the parametric study show that the tensile strength of FRC has great influence on the seismic behavior of the CES column, with the increment of flexural capacity of 5% to 17% by rising of FRC tensile strength from 8 to 16 MPa.