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UNIT 2: THE BONES OF THE BUILDING (STRUCTURES - columns& beams) INTRODUCTION A building has a skeleton. We call it the structure. The structure holds everything up. The two most important parts are columns and beams. STORY 1: What is a Structure? Think about your body. You have bones. They give you shape and hold you up. A building has a structure. The structure is the frame. It can be made of wood, steel, or concrete. The structure carries all the weight. It carries the weight of the roof, the