4-3 Design Features - Shape and Material.notebook

4­3 Design Features ­ Shape and Material.notebookShapeMarch 04, 2013• Rectangular frames and made of two columns and a beam, however alone they areweak.• Triangular frames are made from two diagonal columns, which are also weak.• Need to add support for a weak structure, for example a brace, e or a gusset.Feb 25­11:22 AMShape• The shape of the material can be solid, hollow, or irregular, depending on theforces being applied.• Corrugaons may be used to increase the strength of the structure.Feb 25­11:22 AM2

4­3 Design Features ­ Shape and Material.notebookMarch 04, 2013Material• Materials are chosen based on several consideraons – strength needed,environment, etc.• Composite materials use two different materials together so that the beneficialproperes of both may be used.o Concrete and iron rods – concrete is very strong when pushed, iron rodsare very strong when pulledo FiberglassFeb 25­11:35 AMMaterial• Layered materials (laminates) are used to create extra strength or to takeadvantage of mulple properes.o Juice boxes have a leak resistant inner layero Windshields have a plasc layer to resist shaering• Woven or knit materials are very flexible.o Newspaper (as we saw under the microscope)o ClothFeb 25­11:35 AM3