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  ______    ______    ____     _    _     _____   
 /_____//  /_   _//  |  _ \\  | || | ||  / ____|| 
 `____ `    -| ||-   | |_| || | || | || / //---`' 
 /___//     _| ||_   | .  //  | \\_/ || \ \\___   
 `__ `     /_____//  |_|\_\\   \____//   \_____|| 
 /_//      `-----`   `-` --`    `---`     `----`  
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Text this: The influence of prestressing force on natural frequencies of beams