EXPERIMENTAL STUDYOF AXIAL STABILITY OF RC RECTANGULAR COLUMN UNDERHIGH AXIAL FORCE WITH HORIZONTAL LOAD

摘要

To find causes of serious damage of reinforced concrete buildings in the Republic of Turkey, weinvestigated in regions where it had suffered heavy damage as it was attacked by recent large earthquakes.A lot of RC multiple dwelling house were lost, and the layer or the whole collapsed, and, as a result,extremely a lot of lives were lost.As a result of investigation in Turkey, we guessed the main cause of the collapse of buildings might beinduced by axial destruction of columns by the large compression load, not the one depending in the P-δeffect generally thought.However, it was difficult to find a lot of negligible damages which became the sign or the evidences sothat buildings may destroy it extremely and completely in the quake-stricken area.Then, we tried to reproduce this phenomenon with the column specimens of the specification generallyused in these buildings, and to find the condition that the phenomenon occurs.The result of this experiment showed that the axial deformation of the column became unstable within1cm, and the sudden debacle was shown in the case with a high axial force ratio according to the numberof very few, horizontal cyclic deformations.