Need help with a civil engineering concept

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SUMMARY

The discussion centers on calculating the load-bearing capacity and failure points of an oak rod with a diameter of 13 mm and a length of 7 m. Key parameters include the rod's stiffness (E = 14000 MPa), yield tensile strength (75 MPa), and ultimate tensile strength (90 MPa). The calculations required are: (a) the maximum mass the rod can support, (b) the minimum mass that will cause the rod to break when dropped, and (c) the maximum mass that can be dropped without causing permanent deformation. The context of the rod's orientation and support conditions is crucial for accurate calculations.

PREREQUISITES
  • Understanding of material properties such as stiffness, yield strength, and ultimate tensile strength.
  • Knowledge of basic physics concepts including weight and gravitational force.
  • Familiarity with civil engineering principles related to load calculations and structural integrity.
  • Ability to apply formulas for tensile stress and deformation in materials.
NEXT STEPS
  • Research the formulas for calculating tensile stress and load capacity in structural materials.
  • Learn about the effects of dynamic loading versus static loading on material failure.
  • Explore the principles of material deformation and the factors affecting it.
  • Investigate the impact of rod orientation and support conditions on load-bearing calculations.
USEFUL FOR

Civil engineering students, structural engineers, and professionals involved in material testing and load analysis will benefit from this discussion.

The-UnKnown82
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I can not find a formula to calculate the following question, any help would be appreciated, ty AlephZero for helping me clarify my question.

An example in my problem set (homework help)

An oak rod is hung from a rigid support. The rod has a diameter = 13 mm, length = 7 m, and a catch plate at its base.

a) The maximum mass of a weight that each rod can support.
b) The minimum mass of a weight that will break the rod when dropped from the top of the rod.
c) The maximum mass of weight that when dropped from the top of the rod will not result in permanent deformation of the rod.

Numbers I think can be used:
E (stiffness) = 14000 MPa
Yield Tensile strength = 75 MPa
Ultimate tensile strength = 90 MPa
 
Last edited:
Physics news on Phys.org
"weight" is the force that gravity produces when it acts on "mass". A mass of 1 kg has a weight of about 9.8 N, near to the Earth's surface.

The answer to your question depends on several things you didn't tell us, like whether the rod is horizontal or vertical, how the rod is fixed, and where the mass is placed on the rod. Nobody can guess "which formula to use" without all the relevant facts.
 

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