أرسل هذا في رسالة قصيرة: A MS-Excel user friendly tool for the calculation of effective section area for class 4 slender steel section

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