A-frame

An A-frame is a basic structure designed to bear a load in a lightweight, economical manner. The simplist form of an A-frame is two similarly sized materials laid up against one another, and attached at the top in a convenient fashion. These materials are often wooden or steel beams arranged in a 45-degree or greater angle. These materials are then lashed together with rope, or secured in another fashion such as welding, glueing, or riveting.

Due to having only two "legs", A-frames are usually set up in rows so that they can have good stability. A saw horse is a good example of this structure. More complex structures will have a crossmember connecting the two materials in the middle to prevent the legs from bowing outwards under the strain of the weight.

Additional structures that use A-frames:

• A frame house
• A frame camping tent
• Folding ladder
• Double wishbone suspension (cars)
• Some suspension bridges