Problem 3 A ladder supports the 80-kg man in the position as shown in Fig. 3. The surface is rather slippery, where the coefficient of static friction at A and B is μs = 0.25. Fortunately, an invisible guy helps hold the ladder BC, providing a couple moment shown in the figure. (a) Draw the free body diagram of AC and BC, respectively. (b) Determine the greatest angle 0 so that the ladder does not slip under this condition. Start by assuming the ladder slips at A. 0.25 m 2.5 m 2.5 m OOOO 100 N·m Fig. 3 B

Problem 3 A ladder supports the 80-kg man in the position as shown in Fig. 3. The surface is rather slippery, where the coefficient of static friction at A and B is μs = 0.25. Fortunately, an invisible guy helps hold the ladder BC, providing a couple moment shown in the figure. (a) Draw the free body diagram of AC and BC, respectively. (b) Determine the greatest angle 0 so that the ladder does not slip under this condition. Start by assuming the ladder slips at A. 0.25 m 2.5 m 2.5 m OOOO 100 N·m Fig. 3 B

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter6: Vertical Stress Increase In Soil

Section: Chapter Questions

Problem 6.4P: Refer to Figure P6.4. A strip load of q = 900 lb/ft2 is applied over a width B = 36 ft. Determine...

See similar textbooks

Similar questions

For the beam shown: (a) determine the distance a for which the maximum positive and negative bending moments in the beam are equal; and (b) draw the corresponding shear and bending moment diagrams for the beam.
EB and FG are two planes inside a soil element ABCD as shown in Figure 10.50. Stress conditions on the two planes are Plane EB: EB = 25 kN/m2; EB = +10 kN/m2 Plane FG: FG = 10 kN/m2; FG = 5 kN/m2 (Note: Mohrs circle sign conventions for stresses are used above) Given ; = 25, determine: a. The maximum and minimum principal stresses b. The angle between the planes EB and FG c. The external stresses on planes AB and BC that would cause the above internal stresses on planes EB and FG
For the data given in this problem, determine the magnitude of the active thrust on the wall retaining a c soil, using the procedure discussed in Section 16.10. Given H = 15.0 ft, c = 100 lb/ft2, = 26, = 115 lb/ft3, kv = 0, and kh = 0.3.
Determine the factor of safety against bottom heave for the braced cut described in Problem 15.18. Use Eqs. (15.66) and (15.70). For Eq. (15.70), assume the length of the cut, L = 18 m. 15.18 Refer to Figure 15.51 in which = 17.5 kN/m3, c = 60 kN/m2, and center-to-center spacing of struts is 5 m. Draw the earth pressure envelope and determine the strut loads at levels A, B, and C. FIG. 15.51
A beam is part of the framing system for the floor of an office building. The floor is subjected to both dead loads and live loads. The maximum moment caused by the service dead load is 45 ft-kips, and the maximum moment for the service live load is 63 ft-kips (these moments occur at the same location on the beam and can therefore be combined). a. If load and resistance factor design is used, determine the maximum factored bending moment (required moment strength). What is the controlling AISC load combination? b. What is the required nominal moment strength for a resistance factor of 0.90? c. If allowable strength design is used, determine the required moment strength. What is the controlling AISC lead combination? d. What is the required nominal moment strength for a safety factor of 1.67?