Use Virtual Work Method to answer the questions below considering the truss shown in the figure. Assume A = 1200 mm', E = 200 GPa and a = 12 x 10 /°C a. Axial force on member ED from the real structure in kN. Put (-) negative sign if it's under compression. b. Axial force on member AE from the virtual structure for the vertical displacement at joint A. c. Vertical displacement of joint A in mm due to external force only. Put negative sign if its downward. d. Vertical displacement of joint A in mm due to -100 °C change in temperature in members AE and ED. Don't add deflection due to external loads or fabrication error. Put negative sign if its downward. E 2.6 m to 3.80 kN 4.5 kN -2.6 m +- 2.6 m

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Introduction to Engineering Design

Students are often confused with engineering and design. The term engineering design has two words with different meanings, engineering, and design. The term engineering implies applications of laws and principles of science to design and analyze physical structures and components. In civil engineering, students apply the concept of physics and chemistry to design and build structures and buildings. In engineering disciplines, the term design means determining the dimensions, loads, and associated influences on the component due to the applied loads such as stresses and deformations. The estimation of such parameters is crucial to make the component or structure foolproof.