Forums Forums Traffic Signs General Discussion Seperate Spread Foundation Design Reply To: Seperate Spread Foundation Design


September 2015

Provided the posts are positioned symmetrically and the ground is level, you could just divide the wind load by 3 and design each separate foundation for that.
In theory the middle post is subjected to a greater load, but in practice it is usually convenient to make the 3 separate bases all the same size, on the assumption that the sign structure will deflect slightly under extreme loading to redistribute the load in an efficient way. Each separate base should be designed to support the whole of the point load that could be applied to any point on the sign.