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01-02ChapGere.0024 - A-PDF Split DEMO Purchase from...

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Solution 1.8-10 Tubular post with guy cables SECTION 1.8 Design for Axial Loads and Direct Shear 55 d 2 outer diameter d 1 inner diameter t wall thickness 15 mm T tensile force in a cable 110 kN allow 35 MPa A REA OF POST t ( d 2 t ) E QUATE AREAS AND SOLVE FOR d 2 : S UBSTITUTE NUMERICAL VALUES : ( d 2 ) min 131 mm d 2 2 T cos 30 t s allow t 2 T cos 30 s allow t ( d 2 t ) A 4 ( d 2 2 d 1 2 ) 4 [ d 2 2 ( d 2 2 t ) 2 ] 30 ° 30 ° T T P d 2 P compressive force in post 2 T cos 30 R EQUIRED AREA OF POST A P s allow 2 T cos 30 s allow Problem 1.8-11 A cage for transporting workers and supplies on a construction site is hoisted by a crane (see figure). The floor of the cage is rectangular with dimensions 6 ft by 8 ft. Each of the four lifting cables is attached to a corner of the cage and is 13 ft long. The weight of the cage and its contents is limited by regulations to 9600 lb. Determine the required cross-sectional area A C of a cable if the breaking stress of a cable is 91 ksi and a factor of safety of 3.5 with
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