Question
Download Solution PDFFor a continuous beam bending moment coefficient at center of interior span is (when only dead load is considered) ______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
As per IS 456:2000, Clause 22.5.1, for beams of uniform section c/s which supports substantially uniformly distributed loads over three or more spans which do not differ by 15% of longest.
The coefficients for moments and shear forces are tabulated as follows:
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Table 12 Bending Moment Coefficients (Clause 22.5.1) |
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Type of Load |
Span Moment |
Support Moment |
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|
Near Middle of End Span |
At Middle of Interior Span |
At Support Next to the End Support |
At Other Interior Supports |
|
|
(1) |
(2) |
(3) |
(4) |
(5) |
|
Dead load and imposed load (fixed) |
\( + \frac{1}{{12}}\) |
\(+ \frac{1}{{16}}\) |
\( - \frac{1}{{10}}\) |
\(- \frac{1}{{12}}\) |
|
Imposed load (not fixed) |
\(+ \frac{1}{{10}}\) |
\(+ \frac{1}{{12}}\) |
\( - \frac{1}{9}\) |
\(- \frac{1}{9}\) |
|
NOTE – For obtaining the bending moment, the coefficient shall be multiplied by the total design load and effective span. |
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