A rectangle of an elastic material is deformed in the x, y plane as represented by the dashed lines. No deformation occurs in the z direction. Using E = 300 MPa and a Poisson's ration of 0.40 determine a) The normal strain that occurs along the x, y and z axis b) The shear strain that occurs at corner D (Ans: 0.0117 rad) c) The normal stress in the x and y directions along the axis d) The shear stress at corner D 5 mm 2 mm 4 mm 2 mm: B 300 mm 72 mm A 400 mm- 3 mm

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Plane and Space Trusses

In civil engineering, a truss is the most important structure that forms the most fundamental member of any building structure and commercial complexes. Trusses are composed of individual members or links that are interconnected by suitable joints, such as rivets, welds, or bolts, and nuts. In trusses, the interconnection leads to the formation of a series of triangles joined together such that all the triangular members behave as a single rigid body. In a simple truss, three members are connected to form a truss member. In trusses, the force always acts at the joints or the interconnection between the individual members.