It is said that 3000 psi concrete are more ductile than 4000 psi.. by how many percentage? do you use 3000 psi or 4000 psi in your building (ordinary and special moment frames)? I know so many structural engineers who have never use 4000 psi.. they just use 3000 psi.. how about you?
In lateral movements. Inertia is created in the roof or floor and this is transferred to beams.. to columns.. to foundation.. and to soil.. but what if the soil is stiff like rock and you have a more than average sized foundation for complete fixed rotational restraint of the columns. How does...
