Describir: Prestressed concrete structures

 _    _      ___               _    _     ______    _____      _____  
| || | ||   / _ \\    ____    | || | ||  /_   _//  |  ___||   / ___// 
| || | ||  | / \ ||  |    \\  | || | ||    | ||    | ||__     \___ \\ 
| \\_/ ||  | \_/ ||  | [] ||  | \\_/ ||   _| ||    | ||__     /    // 
 \____//    \___//   |  __//   \____//   /__//     |_____||  /____//  
  `---`     `---`    |_|`-`     `---`    `--`      `-----`  `-----`   
                     `-`                                              
  _____   
 |  ___|| 
 | ||__   
 | ||__   
 |_____|| 
 `-----`