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Unformatted text preview: Myra W W;
a,” “A 4.18 and 4.19 Knowing that for the extruded beam shown the allow— abl‘e’ stress is 120 MPa in tension and 150 MP3 in compression, determine the largest couple M that can be applied. 1““? \ P44; 5: bolting to it the steel
is 1.8 x 10" psi and for A W l I? W2
(:29 73¢? % aw) 4.41 and 4.42 The 6 X 12in. timber beam has been strengthened by
reinforcement shown. The modulus of elasticity for wood
steel 29 X 106 psi. Knowing that the beam is bent about a horizontal axis by a couﬁie of moment M = 450 kip . in“ determine the maximum stress in (a) the wood, (b) the steel, . . W
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bending moment of 175 kN ~ In. Knowing that_the modulus of alas
25 GPa for the concrete and 200 GPa for the steel, determine (a) me
the steel, (b) the maximum stress in the concrete” 4.49 Solve Prob. 4.48, assuming that the 300—mm Width is increased”; 540 mm 350 mm. £1 3 d "
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v: 4.51 Knowing that the bending moment in the reinforced concrete beam
is +150 kip  ft and that the modulus of elasticity is 3.75 X 10" psi for the 1, concrete and 30 X 10“ psi for the steel, determine (a) the stress in the steel, V (b) the maximum stress in the concrete. K i é g; 0 fﬁzﬁwaC/éfﬂ'wj L V 319g; :3 C a; M )y/ as“... Mw.»ww.w~.w,mwn . ...
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 Spring '09
 MOORTHY

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