A beam consisting of ASTM-A36 steel (see Appendix B) and having a W6X12 wide-flange cross section (see Appendix E) is to be used in the supporting structure of a pedestrian walkway. The beam will be...

A beam consisting of ASTM-A36 steel (see Appendix B) and having a W6X12 wide-flange cross section (see Appendix E) is to be used in the supporting structure of a pedestrian walkway. The beam will be subjected to an estimated maximum bending moment of magnitude |M|_max
= 90, 000 in‐lb. Choose a wide-flange cross section in Appendix E with a nominal depth
d
= 6 in so that the beam will have a factor of safety of at least 4.