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Why is that in proving the theorem
- Thread starter xter
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xter,
It's just a sign convention. You can use any mathematically consistant system. Many structural engineers prefer to call downwards deflection "+ve" and the corresponding bending moment positive also. Mathematically however, a downwards load causing a downwards deflection is usually referred to as "-ve" in the conventional x-y coordinate system.
Text books use either convention, depending usually on the author's preference.
It's just a sign convention. You can use any mathematically consistant system. Many structural engineers prefer to call downwards deflection "+ve" and the corresponding bending moment positive also. Mathematically however, a downwards load causing a downwards deflection is usually referred to as "-ve" in the conventional x-y coordinate system.
Text books use either convention, depending usually on the author's preference.
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