Chapter 13, Problem 11RQ

A structure is an intersecting hip roof with the main hip roof outside dimensions being 73 ft long and the width being 30 ft wide. The intersection portion extends 20 ft beyond the 30-ft side, and the intersecting portion is 20 ft wide. The overhang is 2 ft 6 in. and the slope is 5:12. The rafters are 16 in. on center. Based on the information provided, what is the total length of the common rafters in linear feet?

How many board feet is 200 lnft of 2 in. × 6 in wood studs.

Example: 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.

1.     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!)

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.

The 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).

P12.38 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.

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.

Example 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 2000