Sunday, February 05, 2017

Basic Principle for the Seismic design of Buildings: Avoid soft- storey ground floors

Avoid soft- storey ground floors                                             

Avoid soft storey ground floors
                                                            Many building collapses during earthquake is due to fact that the bracing elements e.g. walls, which are available in the upper floors, are omitted in the ground floor and substituted by columns. Thus ground floor that is soft in the horizontal direction is developed (soft storey).
                                                               The columns are damaged by the cyclic displacements between the moving soil and the upper part of the building. The plastic deformations (plastic hinges) at the top and bottom end of the columns lead to a dangerous sway mechanism (storey mechanism) with a large concentration of the  at the column ends.
Sway Mechanism are often inevitable with soft storey ground floors

(For more detail visit