A propped cantilever of span L carries a vertical concentrated load at the mid-span. If the plastic moment capacity of the section is Mp, the magnitude of the collapse load is:
1
\(\frac{{8{M_p}}}{L}\)
2
\(\frac{{6{M_p}}}{L}\)
3
\(\frac{{4{M_p}}}{L}\)
4
\(\frac{{2{M_p}}}{L}\)