Describir: Composite construction in steel and concrete :

  ______     ___      _____     _____    _____       ___     ______   
 /_   _//   / _ \\   / ____||  |  ___|| |  __ \\    / _ \\  |      \\ 
 `-| |,-   | / \ || / //---`'  | ||__   | |  \ ||  / //\ \\ |  --  // 
   | ||    | \_/ || \ \\___    | ||__   | |__/ || |  ___  |||  --  \\ 
   |_||     \___//   \_____||  |_____|| |_____//  |_||  |_|||______// 
   `-`'     `---`     `----`   `-----`   -----`   `-`   `-` `------`  
                                                                      
 _    _   
| || | || 
| || | || 
| \\_/ || 
 \____//  
  `---`