Unit 04 Force method

Indeterminate structures: • reactions or internal forces cannot be determined from equations of statics alone (the number of reactions or the number of internal forces exceeds the number of static equilibrium equations) • it is necessary to satisfy the equilibrium equations (implying that the structure is in equilibrium) and compatibility equations (requirement if for assuring the continuity of the structure without any breaks) and force displacement equations (the way in which displacement are related to forces)