All the tension/compression members of the frame structure shown in the figure are pin-jointed and of equal length and negligible weight. An external load P is applied vertically at joint E. The frame is pin-connected at fixed support A and supported by a roller at D. How many members are in compression?

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.