EXPERIMENTAL RESEARCH AND THEORETICAL ANALYSIS OF SQUARE TUBE FILLED WITH REINFORCED CONCRETE SUBJECTED TO AXIAL COMPRESSION AND BI-AXIAL BENDING MOMENT
This paper presents an experimental research of 9 square steel tube columns filled with steel-reinforced concrete subjected to axial compression and bi-axial bending moment.The primary parameters of the specimens were slenderness ratio,eccentricity ratio,steel-reinforced ratio and angles of loading.The tested results showed that 1) the bearing capacity decreased with the increase of the slenderness ratio and eccentricity ratio;2) increasing steel-reinforced ratio help to raise the bearing capacity gradually;3) loading angle had little influence on bearing capacity.Furthermore,an analysis program was developed,which generates results agreeing well with the test data.At last,formula to calculate the bearing capacity of two-way eccentrically loaded columns are proposed.