The Effect of Confinement and Shear Connector on the Ultimate Capacity of the Short Composite Column

  Mostafa Mohammed Ahmed Mostafa,  Hadad Said Hadad,  Dr Mohammed Taha Nooman

In recent years, the use of encased steel concrete composite columns has been increased significantly in medium or high-rise buildings. Most design codes and researches neglect effect of confinement and shear connectors. The study represents a qualitative transition in the experimental and analytical investigations on shear connectors effectively at steel concrete interfaces. The most studies in the field of shear connectors were devoted to composite beam and slab systems. The aim of the present investigation is to assess experimentally the current methods and codes for evaluating the ultimate load behavior of concrete encased steel short columns with the use of different stirrups ratio and shear connectors with different shapes and sizes to provide resistance to slip at steel concrete interfaces. In the present study nine specimens having a column cross section of (120x160) mm and a length of (800) mm were tested under axial loading. One specimen was chosen to be control column; some specimens were chosen to be strengthened by horizontal stirrups with different spacing (Ø6). The others specimens were chosen to be strengthened by horizontal shear connectors with different spacing and types. The test results show that the decreasing in spacing of stirrups technique gives an increase in the load carrying capacity up to (15 %) of the control ultimate capacity. However, using shear connectors system technique which made of steel reinforcement bars and stud shear connectors welded to flange of steel shape encased concrete gives an increase in the load carrying capacity up to (8.3%) of the control ultimate capacity. In addition, increasing numbers of horizontal stirrups increases the load carrying capacity of the encased composite columns under axial load. The results suggest that the effect of confinement and shear connectors should take in account for increasing the load carrying capacity, ductility and stiffness for column subjected to axial loading.

Keywords- Composite columns; Concrete encased columns; Confinement; Shear connectors.

Unique Identification Number - IJEDR1504028
Page Number(s) - 190-204
Pubished in - Volume 3 | Issue 4 | December 2015
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  Mostafa Mohammed Ahmed Mostafa,  Hadad Said Hadad,  Dr Mohammed Taha Nooman,   "The Effect of Confinement and Shear Connector on the Ultimate Capacity of the Short Composite Column", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.3, Issue 4, pp.190-204, December 2015, Available at :http://www.ijedr.org/papers/IJEDR1504028.pdf