$1.$ Load Rating: $(10$ points total$)$

$$ You have been asked to design a scaffolding system for an existing building that has a deteriorating brick wall that is $85$ ft long by $65$ ft tall. Your construction company needs to tuck$-$ point the mortar joints where mortar has become loose or is missing and replace broken or softened bricks. The average weight of all materials and workers over the whole bay area is what matters on the scaffold planks, not the individual weight of materials over their individual footprints. The scaffold planks will support an uneven distribution of loads.

$$ Scaffolding has a width of $5$ ft for $88$ ft and each scaffold bay is $8$ ft long making it $11$ bays wide.

$1\mathrm{.}1.$ What scaffold load rating will be required for this construction project $($light$-$duty, medium$-$ duty, or heavy$-$duty$)?[$Hint: Review slides $10-12$ in the referenced PowerPoint file.$]$ Justify your answer. $(3$ points$)$ Provide answer in a complete sentence. $(1$ point$)$

$1\mathrm{.}2.$ What live load is required by the load rating answer you gave in part $1\mathrm{.}1$ above $(25$ psf$,50$ psf$,$ or $75$ psf$)?(3$ points$)$ Provide answer in a complete sentence. $(1$ point$)$

$1\mathrm{.}3.$ What is the maximum load capacity $($in pounds$)$ allowed on a bay that is $5$ ft wide x $8$ ft long? $(2$ points$)$

$2.$ Bays with $(1)/(2)-$flat of brick on them: $(5$ points total$)$

$$ Use all the information previously provided.

$$ The schedule requires you to set up scaffolding for the whole length of the wall all in one build

so you can maximize your crew size and minimize your time on site.

$$ There is enough brick deteriorated that the whole wall will on average need only $(3)(1)/(2)-$flats of new brick to replace bad bricks. A $(1)/(2)-$flat of brick $($about $250$ brick$)$ weighs $1,100$ lbs and takes up a footprint of $3-0$ x $3-8$ in plan. Assume that the brick flat can be placed such that the $3-8$ ft dimension is parallel to the wall.

$$ Assume that on average each level and at each bay on that level the wall will require $(3)$ tubs of mortar weighing $180$ lbs each for the tuck$-$pointing. Assume a tub requires an area of $2-0$ x $1-0$ next to a brick mason $($worker$),$ not in the same workspace.

$$ Assume a brick mason $($worker$)$ plus their hand tools weighs $250$ lbs each and needs a plan area of $3$ ft x $3$ ft on the scaffold to work in AND they each must have $3$ ft of wall face to tuck$-$point.

Helpful hint: Use the scale drawings of the plan elements described above $($I have provided a file attached to the end of this assignment$)$ so you can play with the objects in each bay to see what can fit spatially. Remember, other workers must be able to pass behind the brick masons$$ work in progress on any given level and bay.

$2\mathrm{.}1.$ How many brick masons $($workers$)$ can work on a $5$ ft wide x $8$ ft long bay that also has $(1)(1)/(2)-$ flat of bricks on it$?(4$ points$)$ Provide answer in a complete sentence. $(1$ point$)$

$3.$ Bays without $(1)/(2)-$flat of brick on them: $(9$ points total$)$

$$ Use all the information previously provided.

$3\mathrm{.}1.$ How many workers can work on a $5$ ft wide x $8$ ft long bay that has $(3)$ tubs of mortar on it but no $(1)/(2)-$flat of brick? $(4$ points$)$ Provide answer in a complete sentence. $(1$ point$)$

$3\mathrm{.}2.$ Is this limited by space or by the load capacity? $(2$ points$)$

$3\mathrm{.}3.$ Why might I want to plan for $(4)$ tubs of mortar instead of only the required $(3)$ tubs per bay? $(2$ points$)$

$4.$ Transverse bracing$/$tie offs: $(12$ points total$)$

$$ The scaffolding has a width of $5$ ft for $88$ ft and each scaffold bay is $8$ ft long making it $11$ bays wide. Hint: If you have $11$ bays how many vertical frames are required?

$$ The scaffolding levels occur every $6-4$ in elevation $($all above finished grade$).$ To reach the whole $65$ ft tall x $85$ ft long wall with scaffolding we need $10$ working levels with a handrail around the top level. Remember, level $1$ is not at ground level; it$$s $6-4$ above it$.$

$$ Lateral bracing can only be placed where a level and vertical frame intersect so that the force can transfer directly into the frame where it has a horizontal support.

$$ The ground works as a braced level because of the friction developed under the mudsill that the scaffold posts are connected to therefore you do not need any braces at the ground.

$[$Hint: I have drawn an elevation of the scaffolding vs wall. Use the scale drawings of the scaffolding elevation described above so you can play with the locations.$]$

$4\mathrm{.}1.$ If the bracing$/$tie$-$offs to the building must occur at each frame $(8$ ft oc$)$ and must occur vertically at not more than $4$x it$$s least dimension $($the smaller of the dimensions for width, w

$=5$ ft and total length, L $=88$ ft$)$ then what levels must be braced$/$tied$-$off? $(4$ points for correct answer plus $1$ point for showing your work$)$ Provide answer in a complete sentence. $(1$ point$)$

$4\mathrm{.}2.$ How many total braces are required in the entire elevation are required by OSHA for this system? Make sure you count the verticals. $(4$ points for correct answer plus $1$ point for showing your work$)$ Provide answer in a complete sentence. $(1$ point$)$