The optimal economic web depth for a plate girder corresponds to_________________?
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Answer: A. minimum weight
Explanation
The optimal economic web depth for a plate girder is designed to achieve minimum overall weight and material usage. Minimizing structural steel weight directly reduces material fabrication and shipping costs for large girder projects. Economic depth balancing reduces thick web plate requirements while maintaining adequate structural moment of inertia. Plate girders consist of top and bottom flanges connected by a vertical web plate to resist bending moments. Optimizing structural cross sections is a fundamental objective in civil engineering design and economic cost analysis. Girder depth directly influences the required flange area and overall structural steel weight needed for a given span.
Minimizing depth alone leads to excessively heavy flange plates, increasing overall structural steel material costs. Maximizing weight is counterproductive because heavy girders increase foundation loads and project construction expenses. Minimizing web thickness indefinitely can cause local shear buckling failures, requiring costly stiffener additions.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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