The switch shown is designed to close as the temperature rises causing AB and CD to expand and making point E come in contact with point F. Arm AB is made of steel with a CTE of ast = 12x10-6/ °C, and arm CD is made of aluminum with a CTE of aa = 24x10-é /°C. At 20 °C, arm BDE is vertical as shown. Determine the required gap, s, (at 20 °C) if the switch is to close at 120 °C, knowing that LBD = 400 mm and LDE = 160 mm. Express your answer in mm to the nearest 0.001 mm. E D

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Equilibrium and Support Reactions

Civil engineers deal with structures that are composed of several members connected or with individual members such as beams and columns. To analyze such structures, the condition of statics must be applied. Under the static condition, the members are considered to be in equilibrium under the action of forces, that is, the members are assumed to be having negligible velocity.