As per standards, the Roof beams should have a continuous upward slope equivalent to 1/4 in/ft ( 20.8 mm/m) between a drain and the high point of a roof, in addition to minimum recommended camber to avoid ponding.
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As per standards, the Roof beams should have a continuous upward slope equivalent to 1/4 in/ft ( 20.8 mm/m) between a drain and the high point of a roof, in addition to minimum recommended camber to avoid ponding.
For a constant cross sectional the radial stress induced by a bending moment in a member is calculated by using this formula
fr=3M/2Rbd
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Their is always some variation in the design values calculated in timber. Therefore we need to apply the required adjustment to them.
Case- Extreme Fiber Bending
Fb‘=FbCDCMCtCLCFCVCfuCrCcCf
The members which are under the combined effect of axial as well as bending load should satisfy the following equation
Pa/P +Ma /M < 1
Timber coloums are seldom used singly. Mostly they are a group of lumber which are stick together to form a single member. The allowable unit stress on timber is calculated by using the following formula
P/A=3.619E/(l/r)2
When the Columns have square or rectangular cross section
P/A=0.30E/(l/d)2
When the Columns have circular cross section
P/A=0.22E(l/d)2