نوع مقاله : پژوهشی
نویسندگان
1 دانشکده ی مهندسی عمران- دانشگاه صنعتی نوشیروانی بابل
2 دانشکده ی مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل
3 دانشکده ی مهندسی عمران- دانشگاه مازندران، بابلسر
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Due to the numerous advantages of Steel Reinforced Concrete (SRC) as a kind of
composite columns over the reinforced concrete and steel columns, its use has
been widespread in recent years, especially in high-rise buildings. In these columns, due to the presence of steel profiles in the reinforced concrete, the
buckling of the steel components is delayed or does not occur, which would
significantly increase the bearing capacity of the cross-section. In this
research, a numerical study was carried out with the aid of ABAQUS software to
investigate some of the factors affecting the load capacity of SRC columns
under eccentric loading. A finite element model was validated based on
experimental results. A total of 39 SRC columns were analyzed for parametric
study. Geometric and material variables such as steel ratio, slenderness column
ratio, eccentric loading ratio, compressive strength, and stirrup spacing were
evaluated on the bearing capacity of the SRC columns. Also, based on the
calculated values, the axial and lateral load-displacement as well as axial
load-bending moment curves were plotted. The results showed that with increase
in the steel ratio and the reduction of the distance between the stirrups, the
ductility index increased, while with the reduction of the distance between the
stirrups, the bearing capacity of the column increased slightly. Moreover, with
the increase of the eccentricity, the bearing capacity of the columns was
significantly reduced and the slope of the descending branch of lateral load-displacement decreased gradually. Moreover, if the column was less slender, the axial load-displacement curve would have a greater initial slope and with increasing slenderness, the lateral load-displacement would have more
nonlinear behavior due to increased second-order deformation. In addition, the
axial load and stiffness of the composite column were significantly affected by
the concrete compressive strength. The results also indicated that with
increasing the eccentricity, the bearing capacity of the composite columns was
reduced.
کلیدواژهها [English]
)