Structural Performance of Internally Stiffened Double-Skinned Profiled Composite Walls with Openings

The double-skin profiled composite wall (DSPCW) system, filled with concrete material, is favorable in modern structures due to its high strength and ductility. Openings may be required within this for various reasons, similar a conventional bearing wall, which can lead reduction capacity. Therefore, avoid changes the geometry, materials, thickness of DSPCW new internally stiffening concept has been suggested by providing embedded cold-formed steel tube (CFST) columns. For purpose, two full-scale specimens were tested under static axial load, one was fabricated large opening size stiffened octagonal CFST columns, while other designed without an served as control specimen. results showed that achieved slightly lower ultimate (−9.4%) than specimen, no ductility behavior. Furthermore, several finite element models have analyzed investigate additional parameters not experimentally tested, including effects column’s shape different types internal stiffeners longitudinally provided inside these numerical investigation confirmed column cross-section more efficient compared hexagonal rectangular shapes about 11% 18.4%, respectively. using tubes T-shape improved capacity higher corresponding walls investigated stiffener (V-shaped, U-shaped, L-shaped).