Bridge Forces: Identifying Compression vs Tension | Homework Help

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SUMMARY

This discussion focuses on identifying whether members in a bridge are in compression or tension under external forces. The consensus is that determining the state of a member without numerical values for applied loads is challenging and often unreliable. Participants emphasize that visual inspection is only effective for a few obvious cases, and numerical analysis is essential for accurate assessments. The discussion highlights the importance of understanding applied force magnitudes in structural analysis.

PREREQUISITES
  • Basic knowledge of structural engineering principles
  • Understanding of bridge mechanics and load distribution
  • Familiarity with tension and compression concepts in materials
  • Ability to perform numerical analysis of forces
NEXT STEPS
  • Research methods for calculating internal forces in bridge members
  • Learn about graphical methods for analyzing trusses
  • Study the principles of static equilibrium in structures
  • Explore software tools for structural analysis, such as SAP2000 or ANSYS
USEFUL FOR

Students in civil engineering, structural engineers, and professionals involved in bridge design and analysis will benefit from this discussion.

faradayscat
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Homework Statement


How would you determine whether a member is in compression or tension given the bridge with external forces below?

Homework Equations


None.

The Attempt at a Solution


I don't need help finding the forces, I need help in figuring out compression/tension.
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It is not easy to determine compression or tension by inspection when numerical applied loads are given, except perhaps for a member or 2. When you don't have numerical values for the applied loads, generally you can't find tension or compression for most members, even by analysis, because it depends on the magnitudes of the applied forces. I don't recommend finding tension or compression by inspection except in the most obvious cases for specific members.
 

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