REASERCH ON DETERMINATION FOR THE LIMITED COMPRESSIVE STRENGTH AND BENDING MOMENT OF THE STEEL COLUMN BASE USING EFFECTIVE AREA PANDEMIC

In the design of steel column base, parameters of limited compressive strength NRd and limited bending moment MRd are the control conditions that need to be paid due attention, otherwise it will damage the concrete foundation block at the foot of the column. The objective of the article is to use the effective area method in Eurocode 3 standard to determine NRd and MRd of the steel column base, then perform numericalcalculations to check the calculation results. The results show that the NRd and MRd of the steel column base tends to increase when increasing the thickness of the base plate and the grade of the concrete foundation block. Then, corresponding to each thickness of the base plate (from t=18 mm to t=36 mm) and each concrete grade (from C16/20 to C50/60) will give corresponding results for each NRd and MRd. However, it is important to note that the compressive capacity and bending moment of the column base will be limited, can not increase forever, for example, can not overcome the compressive strength Npl;Rd = 1596 kN and the limit bending  strength Mpl;Rd=131.3 kN.m of the concrete foundation block at the base of the column. The article recommends using the results of this study to choose the thickness of the base plate and the grade of theconcrete foundation block in the most effective, accurate and economical way.