During the 1995 Hyogoken-Nanbu earthquake, many concrete buildings suffered complete collapse at an intermediate story. Such collapse is believed to be due to that columns at a certain intermediate story underwent severe shear failure and eventually came to be unable to sustain axial load. To study this, a shear-failing RC column specimen was tested. The specimen was laterally loaded until it came to be unable to sustain the axial load. And the dynamic analysis on the basis of the test results was done. From the study, a rough sketch of the intermediate-story collapse could be made.