Modular ratio m for working stress design method

Project:www.sefindia.org
Component:Code
Category:feature request
Priority:normal
Assigned:PADMAKANT
Status:active
Description

Dear sefians,

As per the working stress design method we calculate modular ratio m by the formulae m =280/3*permissible stress in bending compression.

In this terms numerator we take 280 is how to come???

Regards,
padmakant patel