Abstract
Analytical investigations points out that torsion moment acts on RC columns of rigid frame viaducts, which have irregular planar shape and unequal mass arrangement, and are on irregular ground. Therefore, we carried out loading tests of RC columns subjected to the reversed cyclic torsion and bending, and reproduced seismic damage of RC columns. Moreover, we investigated the influence of torsion on deformation performance of RC columns. As a result, the following was evident. There is little possibility of the collapse of RC columns subjected to combined torsion and bending. Deformation performance of RC columns subjected to combined torsion and bending decrease, however, there is little influence of amount of torsion and hoop reinforcing bar. The reason is that torsional deformation of RC columns localize at the bottom of RC columns. Furthermore, we presented consideration of seismic design of RC structures subjected to torsion moment.
