With the reasonable included Angle, the inclination of ribs can improve the lateral stability of arch efficiently.
在合理内倾角度下，拱肋内倾可以有效地提高拱的横向稳定性。
2
But in a typical structure, floor systems do not need to support lateral loads generated by the inclination of the exterior walls in addition to gravity loads.
Bigger inclination Angle of shear band leads to bigger dissipated energy of lateral plastic deformation and smaller dissipated energy of lateral plastic deformation.