Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Chapter 20, Problem 3P
If hydrogen followed an ideal gas law at all pressures, calculate the pressure at which the density of CHG would exceed that of LH2 (71 kg/m3).
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(20
02 A concrete beam of rectangular cross-section (300 x 400) mm is Prestressed with
wires located at (30) mm from the top of the beam .The wires are initially tensioned to
0-6 mm) diameter wires at (100) mm from the soffit of the beam and (5-6 mm)
a stress of (900 N/mm²). Compute the percentage loss of stress in steel after transfer due
to elastic deformation of concrete.
Given: Es=200 x 103 N/mm², Ec = 25 x 10³ N/mm².
300
за
60000
400
100
546
2046
Reinforced Concrete Design
First Monthly Exam
24/02/2
Q1. A simply supported rectangular beam (300 x 400) mm and span (12) m with live load of
from the soffit of the beam. Compute the stresses at mid-span of beam for the following
(5 kN/m). At the centre of the beam the prestressing force of (120) kN is located at (50 mm)
conditions:
(a) Prestress + self- weight of beam (initial stage).
(b) Prestress + self- weight of beam + Live Load (service stage).
3:00
400
120
K
*
12m
5kN/m.
120 KN
A driven pipe pile in clay is shown in Figure (1). The pipe has outside diameter of 406 mm, and
wall thickness is 6.35 mm.
a. calculate the net point bearing capacity.
b. calculate the skin resistance (1) by using a method, (2) by using A method.
e. Estimate the net allowable pile capacity. Use FS-4.
Figure (1)
5 m
Saturated clay
30 kN/m²
Groundwater
table
y= 18 kN/m
5 m
Clay
C-30 kN/m2
y= 18 kN/m
20 m
C
Clay
-100 kN/m²
19.6 kN/m
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- How many board feet is 200 lnft of 2 in. × 6 in wood studs.arrow_forwardExample: Determine the minimum slope in the upper reach of a chute section of 30 m width. The range of discharge is 150 to 2000 m³/sec. n = 0.015.arrow_forward1. Zinc is an important trace nutrient for photosynthetic organisms (e.g., phytoplankton) in sea water. Calculate the speciation of zinc (Zn(II)) in seawater assuming Zn(II) TOT = 5 x 10-8 M. Provide a list of the metal-ligand complexes and their corresponding stability Constants that you will include in your calculation. If you decide to exclude any of the complexes for which stability constants are provided in Table 9.4, please list these separately and explain your rationale. b. Compute the concentrations of the metal-ligand complexes identified in part a. c. Compute the activities of the metal-ligand complexes using the concentrations calculated in part b and using the data in Table 9.6B to calculate the activity coefficients. (Note—you likely already have a spreadsheet where you calculated activity coefficients from week 3!)arrow_forward
- Q.2 The required design span for the beam given in Q.1 is increased to 18 ft. The design loads are the same as given in Q.1 Check the adequacy of a 10"x16" 10 Caribbean Pitch Pine – (Select Structural) for this these design conditions.arrow_forwardThe timber floor framing for a building comprise floor joists using 2" wide nominal lumber is to be constructed as shown in Fig. 1. The Dead load (D) = 26 lbs./ft² (inclusive of joists and flooring) and the live load L= 40 lbs./ft². Lateral torsional buckling is prevented for all members and normal service conditions and temperatures are expected. (i) Design the floor joists using 2" wide nominal lumber using Southern Pine No. 1 (ii) Design the floor beams using Caribbean Pitch Pine (Select Structural). (Assume a 8" x 14” trial section to estimate beam self-weight for your initial design). Density of Caribbean Pitch Pine = 50 lbs/ft³ (800 kN/m³).arrow_forwardP12.38 WP At a point on the free surface of a stressed body, a normal stress of 64 MPa (C) and an unknown positive shear stress exist on a horizontal plane. One principal stress at the point is 8 MPa (C). The absolute maximum shear stress at the point has a magnitude of 95 MPa. Determine the unknown stresses on the horizontal and vertical planes and the unknown principal stress at the point.arrow_forward
- A pile group of 25 piles has to be proportioned in a uniform pattern in soft clay with equal spacing in all directions. Assuming the value of cu to be constant throughout the depth of the piles, determine the optimum value of spacing of piles in the group. Assume a = 0.7. Neglect point bearing effect, and assume the piles to be circular.arrow_forwardExample 5 By using the yield line theory, determine the moment (m) for an isotropic reinforced concrete two-way slab (supports on two S.S sides shown in figure under the load (P) (all dimensions are in mm). Solve by using equilibrium method m m 3000 2000 2000arrow_forwardA +7.5% grade meets a horizontal grade on a section of a rural mountainous highway. If the length of the crest vertical curve formed in that section is 300 ft long, determine the safe operating speed on the highway.arrow_forward
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