Analysis on the worst load angle of Z-shaped concrete columns

The worst load angle of Z-shaped section reinforced concrete column is calculated at double bias voltage in the method of numerical analysis. The variation of the worst load angle according to different material characteristics and section is analyzed. It is shown that, material characteristics of concrete, reinforcing steel etc. almost has no effect on the worst load angle of Z-type section column, while the variation of section aspect ratio and the ratio of height to thickness has an obvious effect on the worst load angle. In the paper, the equations of correlations is regressed according to calculated results.