Experiment of Antiseismic Ductility of Hollow Rectangular Thin-walled Pier

Abstract

For further researching on antiseismic ductility of rectangular cross-section and hollow thin-walled piers, pseudo-static test for four specimens of such piers were performed under constant axial load and cyclically reversed horizontal load. The failure modes, effects of ductility and dissipated energy under the combined action of press, bending and shear were discussed, considering the effect of axial compression ratio and stirrup ratio on the ultimate strength and ductility of the specimens. The result shows that (1) failure mode of specimens is bending failure and their ductility factors falls between 3.61 and 5.56; (2) stirrup rate takes the main responsibility for antiseismic ductility of piers, displacement ductility factor improves with increasing of the stirrup ratio, and stirrup could greatly improve the capacity on ductility and energy dissipation; (3) ultimate bearing capacity, later stage deformation capacity and antiseismic performance decline with the increase of axial compression ratio. The restoring force model which has eight characteristic points was built and the calculation formulas for the characteristic points were presented.