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Questions and Answers
Where does the maximum moment occur for a single moving load?
Where does the maximum moment occur for a single moving load?
Where does the maximum shear occur for a single moving load?
Where does the maximum shear occur for a single moving load?
What governs the design of a beam subject to moving loads?
What governs the design of a beam subject to moving loads?
Where does the maximum shear occur for two moving loads?
Where does the maximum shear occur for two moving loads?
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What is the main concern in designing beams and girders subject to moving loads?
What is the main concern in designing beams and girders subject to moving loads?
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Why is it important to determine the maximum moment under moving loads?
Why is it important to determine the maximum moment under moving loads?
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What is the effect of multiple moving loads on a beam?
What is the effect of multiple moving loads on a beam?
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Why is shear force analysis important in designing beams subject to moving loads?
Why is shear force analysis important in designing beams subject to moving loads?
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What is the main consideration in designing beams subject to moving loads?
What is the main consideration in designing beams subject to moving loads?
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Why is it important to consider moving loads in beam design?
Why is it important to consider moving loads in beam design?
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Study Notes
Moving Loads
- Moving loads can cause bending moments and shear forces in beams
- Maximum moment under a particular load occurs when the center of the beam is midway between that load and the resultant of all the loads on the span
Determining Maximum Moment and Shear
- Compute the maximum moment under each load
- Use the largest of these moments for the design
- Usually, the largest moment occurs under the largest load
- Maximum shear occurs at the reaction where the resultant load is nearest
- Sometimes, it is necessary to check the condition when the larger loads are on the span and the rest of the smaller loads are outside
Sample Problems
- Sample Problem #1: A truck with axle loads of 40KN and 60KN on a wheel base of 5m rolls across a 10m span. Maximum bending moment and maximum shearing force are calculated as 160KNm and 80KN, respectively.
- Sample Problem #2: A tractor weighing 3,000lb, with a wheel base of 9ft, carries 1,800lb of its load on the rear wheels, crosses a 14ft span. Maximum moment and maximum shear are calculated as 6,380lb-ft and 2,318.5lb, respectively.
- Sample Problem #3: Three wheel loads roll as a unit across a 44ft span, maximum moment and maximum shear are calculated as 12,736lb-ft and 12,881lb, respectively.
Single Moving Load
- Maximum moment occurs when the load is at the mid-span
- Maximum shear occurs when the load is very near the support (usually assumed to lie over the support)
Two Moving Loads
- Maximum shear occurs at the reaction when the larger load is over that support
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Description
Quiz on finding maximum bending moments and shear under multiple moving loads on a beam, following a specific rule for calculation.
