أرسل هذا في رسالة قصيرة: Tall building: effect of opening on torsional rigidity of a 3-D core wall

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