Describir: Plastic design of steel frames

  _____    __   __    _____      ___     _____      _____     _  _     _____   
 / ____||  \ \\/ //  /  ___||   / _ \\  |  __ \\   |  ___||  | \| ||  |  ___|| 
/ //---`'   \ ` //  | // __    | / \ || | |  \ ||  | ||__    |  ' ||  | ||__   
\ \\___      | ||   | \\_\ ||  | \_/ || | |__/ ||  | ||__    | .  ||  | ||__   
 \_____||    |_||    \____//    \___//  |_____//   |_____||  |_|\_||  |_____|| 
  `----`     `-`'     `---`     `---`    -----`    `-----`   `-` -`   `-----`