Abstract
Angle steel frame confined concrete columns (ASFCs) are an improved form of steel-jacketed concrete composite columns. An ASFC consists of an concrete column and an inner angle steel frame (ASF). The ASF offers two advantages: confining core concrete and improving seismic performance. The existing studies have been limited on seismic performance of ASFCs. This paper presents experimental and numerical studies on seismic performance of ASFCs. The experimental program included the lateral quasi-static cyclic tests of eight specimens, with the main variables being the axial compression ratio, the section form and the assembly of steel batten. The numerical program included establishment process of numerical models in finite element analysis software (OpenSees), and the expanding analysis on influence factors of ASFCs. The experimental results showed that all ASFCs have high bearing capacity, high ductility and full hysteretic curve. The numerical model could provide reasonably accurate prediction of experimental results. The factor analysis showed that axial compression ratio and steel content of angle steel are two main factors for seismic factors, and the confining effect exerts great influence on dividing axial compression ratio.
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