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3. Draw a schematic or an FBD of the retaining structure. Indicate all the forces acting on it that were supposed to be considered when it was designed.
Given retaining structure: RIPRAP
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- A continuous-strip wall footing is shown in cross section in Fig. P5.5. It is proposed that tensile reinforcement be provided using No. 8 (No. 25) bars at 16 in. spacing along the length of the wall, to provide a bar area of 0.59 in²/ft. The bars have strength f, = 60,000 psi, and the footing concrete has f' = 4000 psi. The critical section for bending is assumed to be at the face of the supported wall, and the effective depth to the tensile steel is 12 in. Check to ensure that sufficient development length is available for the No. 8 (No. 25) bars, and if hooks are required, sketch details of the hooks, giving dimensions. Note: If hooks are required for the No. 8 (No. 25) bars, prepare an alternate design using bars having the same area per foot but of smaller diameter such that hooks could be eliminated; use the largest bar size possible to minimize the cost of steel placement. 66"- 12" 27"- 27"- Wall 12" 16" Page 227 / 813 No. 8 (No. 25) bars at 16" spacingCheck the wall below for sliding and overturning. Does it work? The wall thickness at the top reads 2! The backfill is considered granular. is fünf +-24 Backfill Type 2 X = 1201b/p/²³24 = 31° M = 0.42 8₁=150 151/47 3 16"find the equivalent horizontal force acting on the retaining wall
- Describe about the slab–buttress structure.Describe the role of each of the structural features circled in red of theretaining wall (arm or stem, heel, key and toe) depicted in Figure Q2(b)aimed at resisting the pressures/stresses being imposed on the retainingwall by the mass of soil, mass of the retaining wall and any moisturecontained in the soil. Make particular references to the actions of normalstresses, shear stresses and bending moments.Determine the seismic design force (in pounds) for a parapet braced at the top. The concrete (150 pcf) parapet measures 4 ft tall and 6 in thick. Perform the analysis on a 1 ft strip of parapet. In other words, the parapet for analysis measures 12 in long x 4 ft tall x 6 in thick. The parapet is on the roof, so z = h. Use SDS = 1.0 and Ip = 1.0.
- Consider the MSE retaining wall shown below. Assuming that the reinforcement is a geotextile fabric with TULT = 10500 lbs/ft. Only consider internally stability. Do not check external stability. Assume that the backfill material and the native foundation soil have nearly identical soil properties: = 31° and y = 130 pcf. Evaluate the wall at 2 ft, 10 ft, and 20 ft below the retained ground surface. Determine the most appropriate vertical spacing (Sv) and total length of the reinforcement needed for the wall considering the requirements at each depth. Hi = 22 ft and H2 = 3 ft. H1 :- H2Provide a note on the following with variation of pressure distribution Cantilever Retaining WallDetermine the flexural stresses in the following sections using the Transformed-area method 1) 48" 3 #9 | 12″ | 14" 21" 3" M = 100 ft-k n = 10
- The contractor would like to increase the shore spacing to allow more clearance for access below the formwork. What are three changes in the design of the formwork (not changes in the concrete or the construction live loading) that could be made to accommodate the increase in spacing. No calculations needed. Just list the formwork design changes.In a retaining wall, what happens if values are lower than the load capacity safety factor and how would it be solved?3. If a wall has a total height of 4m and a width of 25 ft, find the number of 10 by 20 by 40 cm CHB, the horizontal reinforcement at every 2 layers and its vertical reinforcement spaced at 60 cm on center. Commercial length of = 10 mm ø by 9.0 m (Use Area Method and Unit Block Method) steel bar