A selected structural douglas fir-Larch 4*16 beam on a 20ft span support a hoist located at the center of the span. determine the maximum allowable load on the hoist (including its weight) based on the bending. Assume normal load duration.The beam is supported on a 2*4 top plate. Lateral support is provided onl at the ends of the member and the ends are cosidered pinned. In addition, this time the beam used is known to be located in the unventilated rafter space of a commercial barn in Louisiana. As such, the beam will routinely experience both elevated temperatures and humidity. Assume that the temperature up in the rafters is often between 1100F and 1200F. In addition, assume that the beam often has a moisture content around 21%. You can keep all the original assumptions as the example in class. Take the time dependent variable for LRFD (λ) as 1.0. Also assume that bending governs the design and not shear or deflection. Draw a quick sketch of the beam, supports and loading as a freebody diagram. Show all work. Check for the beam capacity to resist shear stress from maximum(moment controlled) load. Hint: Use LRFD design criteria
A selected structural douglas fir-Larch 4*16 beam on a 20ft span support a hoist located at the center of the span. determine the maximum allowable load on the hoist (including its weight) based on the bending. Assume normal load duration.The beam is supported on a 2*4 top plate. Lateral support is provided onl at the ends of the member and the ends are cosidered pinned. In addition, this time the beam used is known to be located in the unventilated rafter space of a commercial barn in Louisiana. As such, the beam will routinely experience both elevated temperatures and humidity. Assume that the temperature up in the rafters is often between 1100F and 1200F. In addition, assume that the beam often has a moisture content around 21%. You can keep all the original assumptions as the example in class. Take the time dependent variable for LRFD (λ) as 1.0. Also assume that bending governs the design and not shear or deflection. Draw a quick sketch of the beam, supports and loading as a freebody diagram. Show all work.
Check for the beam capacity to resist shear stress from maximum(moment controlled) load.
Hint: Use LRFD design criteria
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