Title: Ultimate anchorage capacity of concrete filled steel box connection as footing
Abstract: Damage due to recent earthquakes has resulted in an increased conservatism in the design of piles and pileto-pile cap connections. In contrast, current recommendations produce connection detailing which result in high levels of congestion of steel reinforcement in pile cap, which make extremely difficult to construct according to designer’s recommendation. By considering this point, a new type of footing, concrete filled steel box (CSFB) connection as footing, is presented. Steel concrete sandwich structure is a relatively new form of structural system. This form of structure has the potential to fully utilize strength of both steel and concrete with help of composite action such as confinement. It allows the prefabrication of large section in a factory, and enables rapid installation into main structure, dramatically reducing the fabrication cost and construction time. Steel faces act as permanent formwork during the construction and provide impermeable skins for the structure upon completion. Our purpose in this study is to develop design method for the CSFB footing by using a 3-D nonlinear finite element program CAMUI, which the authors’ group has developed. Therefore we can take part in the development of simple and economical hybrid structure with excellent mechanical properties. First of all, numerical simulation, with the help of 3D non linear FEM program, of experimental specimens was carried out. The experimental program included five specimens were conducted in two phases. First phase included two specimens subjected to axial loading on column. The variable parameter for the first phase is concrete depth under the column. Second phase included three specimens subjected to monotonic loading perpendicular to longitudinal axis of column. The variable parameter for the second phase is column insertion length. After confirming the reliability of 3D non linear FEM program, parametric analysis was carried out and these parameters are insertion length, concrete strength, box size, column size, column length and box tube thickness. In this paper the effect of these important parameters are closely observed that will be useful for the development of design method of this type of footing.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: dissertation
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