Abstract
This paper studies the axial compressive behavior of square timber filled steel tube (TFST) stub columns. A total of twelve specimens, including bare timber columns, hollow steel tube columns, and TFST columns, are fabricated and tested. Test variables include the number of confining carbon fiber reinforced plastics (CFRP) layers and the timber condition (with or without knots). The failure modes, load versus deformation relationships, strain characteristics, ultimate strength, ductility, stiffness, and strength-to-weight performance are investigated. The confining effect of CFRP on TFST columns is also analyzed. Test results show that the TFST columns have higher strength and ductility compared with the hollow steel tube columns or the bare timber columns. The presence of knots reduces column strength and ductility. CFRP can increase the axial compressive strength of columns. TFST columns have good strength-to-weight performance, indicating that high strength values can be achieved using light TFST columns.
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