Plastic analysis conducted via the statical approach satisfies_______________?
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Answer: B. equilibrium and plastic moment conditions
Explanation
The statical approach in plastic analysis is based on establishing a safe lower-bound estimate of the collapse load. This method requires that an internal bending moment distribution satisfies equilibrium equations throughout the structure. Additionally, the internal moments must nowhere exceed the ultimate plastic moment capacity of the individual members. Plastic analysis determines the ultimate collapse load of structures by exploiting the ductility of steel materials. Equilibrium conditions ensure that external applied loads balance internal shear forces and bending moments perfectly. Yield moment constraints dictate that structural sections cannot develop bending moments higher than their plastic capacity.
Satisfying mechanism conditions is characteristic of the kinematic or upper-bound approach rather than the statical method. Restricting analysis to equilibrium conditions alone without checking plastic moment limits would yield unsafe designs. Ignoring equilibrium while focusing solely on plastic moments violates fundamental laws of structural statics and mechanics.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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