A beam is built up by welding four L64 × 64 × 9.5 angles lo a piale having cross-sectional...

A beam is built up by welding four L64 × 64 × 9.5 angles lo a piale having cross-sectional dimensions 200 mm by 10 mm (Figure P7.13). Properties for the angle section are given in Table A.5 of Appendix A. The allowable flexural stress is 60 MPa. Determine the magnitude of the allowable bending moment Mx.

FIGURE P7.13