In its most basic form, a beam bridge consists of ... Pre-stressed concrete is an ideal material for beam bridge construction; the concrete withstands the forces of compression well and the ...

You can do it if you’ve done any basic carpentry work like framing in a wall or building a shed or deck. In fact, removing the wall and replacing it with a beam will only take a half-day or less.

the idea is to use a fairly commonplace wooden stock — the classic 2×2 beam — as an elementary but robust building-set component: an Erector set for shelves, desks, and chairs. The basic ...