Chapter 12, Problem 12.14P

The figure shows the section of a gravity dam (non-overflow portion) built of concrete. Calculate (neglecting earthquake effects) the maximum vertical stresses at the heel and toe of the dam. Assume weight of concrete = 23.5 kN/m, and unit length of dam. Allowable stress in concrete may be taken 2500 kN/m and assuming yw = 9.81 kN/m. Max. W.L.. =285-0 6m =289-0 280-0 3 of drainage gallery Tail water 01 =211-0 205-0 56m

The cantilever truss is part of vertical support system subjected to dead loads (D) and snow loads (S). The dead load is 70 psf (pound per square foot) and the snow load is 40 psf. The trusses are spaced at 20 ft apart. a) Determine the joint vertical loads PD and PS acting on joints C, D, E, F, and G. b) Determine the axial force in column JL due to dead load and due to snow load. c) Determine the force in truss member JF due to dead load and due to snow load using the method of sections. d) Using the LRFD load combinations, what it the maximum load Pu in column JL? e) Using the LRFD load combinations, what it the maximum load Pu in truss member JF?

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