Two more books that I have found to be the most basic but most definative and best intro to structural steel design and strength, from my old Purdue days many moons ago, a joy to read by all in the structural steel business and a must by any CWI,,,,,,,
Why Buildings Stand Up, by Mario Salvadori, W.W. Norton Publ., ISBN 0-393-30676-3 , 1980, 1990
Why Buildings Fall Down, by Matthys Levy& M. Salvadori, W.W. Norton Publ. ISBN 0-393-31152-X, 1992
Still might be available thru ,,,,Powells Books, Powells.com, Portland, Oregon 800-878-7323