Download Lateral Bracing Loads - Laboratory 13 - Concrete Construction | BCM 38000 and more Lab Reports Civil Engineering in PDF only on Docsity! gp BCM 380
Spring 2007
Lab # 13— Lateral bracing loads
Lab division (1) 2
(circle one)
Show all calculations.
State and explain all assumptions.
List all tables and charts that are used
A reinforced concrete slab form has plan dimension of 84 feet by 150 feet and will be used to construct
areinforced concrete slab 7 inches thick. The concrete will be placed using motor buggies and has a
normal density. The height to the top of the slab above the floor slab below is 13°-6” and the weight of
the slab form is estimated to be 10 psf. The form sheathing is %” Plyform, joists are 2x8s, and the
stringers are two ply 2x10s.
1. What is the minimum lateral load for designing the bracing for this form recommended by
Committee 347 of the ACI?
2, What is the total weight of the R/C slab and the forms? What is 2% of this total dead load?
3. Spreading 2% of the dead load along the slab edge results in what distributed loading on the 84
foot edge of the form?
4, Spreading 2% of the dead load along the slab edge results in what distributed loading on the 148
foot edge of the form?
5. What is the lateral load (in pounds) that the lateral bracing system should be designed to
withstand in a direction parallel to the 136 foot side of the form?
6. What is the lateral load (in pounds) that the lateral bracing system should be designed to
withstand in a direction parallel to the 75 foot side of the form?
7. Assume the shores supporting this form are spaced six feet on centers in both directions. Using
lumber X-braces attached at the bottom and top of the shores what length 2x4 braces are needed?
8. Ifthe allowable tension stress for the 2x4 brace is 675 psi what force can it safely carry? What
horizontal force will a single brace safely resist?
9. How many X-braces (i.e. pairs of 2x4s) will be required at a minimum in each direction (parallel
to both the 150” and 84’ sides) to safely resist the lateral loads?
380Lab13 spring 2007.doc
Al #3 | Bom 3Po- 1 | Gun [My
a, ‘| AE
; @ gy diay: Giheyigoy = ~ 37.8
: ' gley forme 410 ps i Co2piase, ooelp) ae
' 91S ast | ‘ i
| LUZ s.pst¥ B4'Lise') =f, 230, 288 1p fo: ;
3) for SH’ side GAS pst Kaw "Yrse's ~ 24,370 We 84" - \27sMiis)
i Ga 195 pe piso = 24, $70 Wo] iso’ = LL GAVAlEy
S)aas pecs J Pawo I) |
1 : |
LY i64 pPLiso').= (24, bee te) —
|
wy 135° PIS - 225° 925° Le * |
(UAB)? + GP = x?
X= G7, 74904
¥efig.0]
ib .
3.0" Lt
3540 ty Xx
i. 9) Bm Fin eek. dipahion
! " ej t ~
| Aigeeh (tacos oe deen
cheats + - :
150" ctivecdion (6293 ed She 5
ve _ ( " ) aoe (6071 Mhbere Ys gloves) = Ib.2 Va
! apeats .
| W' clitections Go'Xie glt)= P84 Ke | el |
| wep 1030 *GboH "ale X26 shovesy= 15.7
