Abstract
It has been pointed out that the interaction of 3D components of earthquake waves plays a critical role on the ultimate seismic behavior of structures. In fact, numerical analyses have shown some results to support the importance of considering multi-directional nature of seismic loads. However, this fact has rarely been examined by experiments primarily because of the difficulty in applying 3D loads, not to say the difficulty in carrying out 3D pseudo-dynamic tests. Herein, we developed a 3D structural experiment system that is capable of conducting pseudo-dynamic tests and then, confirmed its validity by some cyclic loading tests and pseudo dynamic tests on thin-walled circular steel columns.
