Experimental Research On The Seismic Performance Of L-Shaped Cross Section On Steel Reinforced Concrete Short Columns

The special-shaped column system emerged in the late 1970s, in recent years, it has got a relatively fast development and the relevant research has also yielded a quantity of achievements, however, owing to the influences of the factors, such as the relatively weakness of the web and flange of the special-shaped column, and the asymmetry of the cross section and so on, the bearing capacity of the special-shaped column is low as well as the ductility is poor, which seriously affect the application of the system in practice. Especially in the high-intensity contour, according to the regulations of The Concrete Structure of the Special-Shaped Column of Order JGJ149-2006, which regulates the buildings height of the special-shaped column in eight seismic degree area: frame system can not be more than 12 meters, the Frame-shear wall structure more than 28 meters, which greatly restrict the application of the special-shaped columns. The existing data shows that add steel to the special-shaped column can improve its ductility to a large extent. Based on the fact, the author of this study carries out the further research on the seismic performance of the L-shaped cross section on steel reinforced concrete short columns, and the principal tasks are as follows.Production design by 14 L-shaped steel reinforced concrete columns and two L-shaped reinforced concrete columns, in considering the span ratio, axial pressure coefficient, the rate and volume hoop with the rate of bone parameters on the L-shaped columns on the basis of performance, the L-shaped steel reinforced concrete columns of the seismic performance of low-week trial. The testing process, observation of the L-shaped column in cracks, damage and destruction of shape, L-shaped steel reinforced concrete columns for the damage pattern: shear baroclinic destruction and damage of two shear bond.Analysis of the L-shaped steel reinforced concrete columns hysteresis curve and the major test parameters on the hysteresis curve of the impact of that with the rate of bone, hoop rate, shear span ratio increases, from more fullness hysteresis curves, curve contains a large area, larger plastic deformation ability to limit big deformation; Instead, the opposite conclusion. And axial pressure coefficient is low, the hysteresis curve relatively narrow, small deformation, recycling less frequently. At the same time received by the hysteresis curve skeleton curves of the axial pressure coefficient, inter-cut than with hoop rate and the rate of bone with specimen skeleton curves the impact of that change will not change with the rate of bone skeleton curve shape; change Axial pressure coefficient matrix can change the shape of curve; volume hoop rate of change can only change the skeleton curves of the decline in such conclusions. Finally simple analysis and the displacement ductility than the restrictions and pressure coefficient values week for the L-shaped steel reinforced concrete columns designed to provide a reasonable scientific basis.