The standard acceptable 28-day compressive strength of 150mm clay masonry hollow units in MPa (on the gross area)is?
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- The standard acceptable 28-day compressive strength of 150mm concrete masonry hollow units in MPa (on the gross area)is? а. 12 O b. 7 С. 21 O d. 17 О е.8Questions 9. An RCC slab (M 25 grade) of dimensions 5 mx 5 mx 0.15 m, is supported on four square columns (M 25 grade) of side 400 mm, the clear height of each column being 3 m . Assuming rigid connections, the fundamental time period of vibration of the slab along the horizontal direction is nearly (use IS 456). (a) 4.12 s (b) 2.80 s (c) 0.50 s (d) 0.07 s2. A reinforced concrete beam having a width of 280 mm and a total depth of 600 mm isreinforced for tension at the bottom with 6 - 36 mmɸ bars placed on two layers, 4 bars onfirst layer and 2 bars on second layer. Compute the effective depth of the beam and theclear horizontal spacing between bars.
- A soil sample (sand) obtained from trench has water content of 38%. The specific graavity of solid is 2.65. Determine the maximum permissible upward force if factor of safety is 3. a. 1.007 b. 0.822 c. 0.274 d. 0.107For the 150mm hollow concrete vertical cell unit, the most common type is I. Select one: O True O False The standard acceptable modulus of rupture of partially-grouted hollow unit walls in running bond with type M joint mortar in MPa is? а. 17.2 O b. 6.9 О с. 12 d. 8 e. 0.69 Clear my choice10. Refer to Figure III-1 attached. What would be the required slab thickness according to the AASHTO 1972 design guide for the following conditions: Daily ESAL=2,000, 20-year design period, design working stress ft = 600 psi, and a modulus of subgrade reaction of 200 psi/in?a. 6.5b. 9.5c. 10.5d. 11.5
- 1.) The specific weight of the concrete is 150 ??⁄??3, and the coefficient of friction between the base of the dam and the foundation is 0.42. If the factor of safety against overturning is 2, compute for the minimum width of the dam. CHOICES a.) 8.416 b.) 4.681 c.) 6.841 d.) 1. 684 2.) The specific weight of the concrete is 150 ??⁄??3, and the coefficient of friction between the base of the dam and the foundation is 0.42. Use 1.5 as the factor of safety (F.S) against sliding. Calculate the width of concrete dam that is necessary to prevent the dam from sliding. Unit of the Correct Answer: ft CHOICES a.) 5,783 b.) 7.358 c.) 3.578 d.) 8.357Q4: Use the rectangular loaded area to calculate the increase in vertical stresses at points (A) and (B) due to the loaded area of footing. Choose figure (1) or (2). Top view Top view it. awT CLAY 1 CLAY 1 CLAY 2 10m x 10m 150² INCOMPRESSIBLE Figure (1) B G.W.T ME CLAY 1 CLAY 1 CLAY 2 YA 10mX10m 7-15076 INCOMPRESSIBLE Figure (2)3. Compute the resultant lateral force for the soil-wall system shown in Figure 3. You may ignore tensile cracks. Use •A- Coloumb •B - Rankine +30", y-20&N m Ground water table 7m e-SOKNim, -10,y-18KN/m° +25, y-20KN m Gravity wall Figure 3
- What will be the nature of surface of pipe if the flow of water is taking place having roughness size (k) = 0.10mm, yields an average shear stress at pipe boundary To 250N/m², take v = 10-6m²/sec A Hydrodynamically smooth B Hydrodynamically rough C In transition zone D Data insufficient IIAISI 1035 CD Steel Fy = 1.2 KN Fx = 2.5 KN Fz = 3 KN point is A. Find the factor of safety using Maximum Shear Stress failure theory. 50 300 40 50 25 40 Fy 35 380 Fx Fz6. A rectangular 12m x 9m coal pillar is located 100m below surface. Panel road widths are 7m, mining height is 2.5m. Panel encounters a dolerite sill and the load increases by 15%. i. Calculate the load and safety of the pillar. ii. Calculate the thickness of the dolerite sill and new safety factor. iii. Discuss the controllable parameter/s in regards to enhancing the stability of the beam in the roof.