The ladder is one of the elements of the structure to bring it to the floor to floor is similar in that there is a slant. If we analyse, in detail, for the design, and then will be to pressure along the slant of the stair design difficult because of pressure and bending strength must join together. Sometimes, there are also certain types of ladder (Torsion) torsion is involved with another, so in the following design will say only that there is a ladder pattern is appropriate for simple use. And the estimated value of which, contained in the safety criteria.
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