Definition: A building with flexible lateral stiffness will produce large horizontal displacement under wind load or horizontal earthquake. Due to the vertical load of the structure, the lateral displacement of the structure will further increase, and the internal components of the structure will produce additional internal forces. This effect, which makes the structure geometrically nonlinear, is called gravity second-order effect.

Application:

1, the software has a switch considering the second-order effect of gravity; Suitable for rigid and elastic floors.

2. Considering the second-order effect of gravity, the calculated length coefficient of the column remains unchanged.

3. Other circumstances that need to consider the second-order effect of gravity.