2. Two rods connected as shown carry a vertical load of 20 kN. Rod AB is a steel rod with E = 2 X10³ MPa while rod BC is made up of aluminum whose E = 7x10¹MPa. The rods are rigidly pinned at A and C and have cross-sectional areas equal to 400 mm². If a is changed from 30° to 45°, compute: (a) stresses in each rod. Specify if tensile or compressive stress (b) deformation of each rod. Specify if elongation or shortening. B P=20 KN L=3m α=30° 70=30° L=2m

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Material Properties

Construction in civil engineering demands high strength, durability, and longevity. These targets can be achieved by better design and analysis, along with the correct choice of materials. Different materials have different properties and hence, they respond and performs differently under the various condition of external loadings. It is therefore a critical task of an engineer to select the right material based on the property that the material is supposed to function in real-time. When speaking about the property, there are different categories of material properties like chemical property, physical property, mechanical property, electrical property, magnetic property, thermal property, etc. These material properties form the basis of material selection in various applications.