Beam ABCDE has a moment release just right of joint B and has concentrated moment loads at D and E. In addition, a cable with tension P is attached at F and runs over a pulley at C (Fig. a). The beam is constructed using two steel plates, which are welded to form a T cross-section (see Fig. b). Consider flexural stresses only. Find the maximum permissible value of load variable P if the allowable bending stress is 130 MPa. Ignore the self-weight of the frame members and let the length variable L = 0.75 m.

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Ax A Ay Xx F 3L B 4L- Cable Pulley 2PL C Moment P release (just right of B) 4L -4L D Dy 4L 8PL E Ey