concrete - filled steel tube columns - tests ... - CCVI Information

Ratio Test / EC42.001.751.501.251.00Short circular (364)Long circular (369)Circ. with Moment (255)0.750.500.00 0.50 1.00 1.50 2.00 2.50Local buckling criteria. Eurocode 4 implies local buckling possible if > 1Figure 3. Circular Columns. Ratio Test/EC4 against Eurocode 4 local buckling criteriaRatio Test / EC42.001.751.501.251.00Short rectangular (330)Long rectangular (212)Rect. with Moment (125)0.750.500.0 0.5 1.0 1.5 2.0 2.5Local buckling criteria. Eurocode 4 implies local buckling possible if > 1Figure 4. Rectangular Columns. Ratio Test / EC4 against local buckling criteriaLocal bucklingThe Test/EC4 ratio plotted against the local buckling criteria is shown in Figure 3 for the circularsection columns and in Figure 4 for the rectangular section columns. There is a generaldownward trend in the results for both circular and rectangular section columns when the localbuckling criteria is exceeded ( > 1.0) so it is probably desirable to keep the existing limits. Insome tests the steel would have had to be over twice as thick to satisfy the Code criteria;