Design method for mitigation
Two step design method is proposed
Pls mail to Dr.H.Yoshida
More detail or others
For a boulder which
occurs frequently, the design metod based on the allowable stress is suitable.
Structures behave in the elastic range.
Permanent deformation or damage must be little.
For a boulder
which occurs unusually, the ultimate strength must be verified.
Maximum deformation must be restricted.
Sudden failure must be avoided.
Flexibility of members and deformability of material