![]() If there are n more independent force components in the structure than there are independent equations of statics, the structure is statically indeterminate to the n th degree. (i) (ii) (iii) (iv) Portal Frame Structures Assumptions for the Approximate Solution In order to analyze a structure using the equations of statics only, the number of independent force components must be equal to the number of independent equations of statics. Structural requirements usually necessitate the use of statically indeterminate layout for portal frames, and approximate solutions are often used in their analyses. Portal Frame Portal frames, used in several Civil Engineering structures like buildings, factories, bridges have the primary purpose of transferring horizontal loads applied at their tops to their foundations. ![]()
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