WORKING STRESS, ULTIMATE LOAD, AND LIMIT STATE METHODS-ALL YOU NEED TO KNOW
Working Stress method
This method of design was the oldest one. It is based on the elastic theory and assumes that both steel and concrete and elastic and obey Hook’s law. It means that the stress is directly proportional to strain up to the point of collapse. Based on the elastic theory, and assuming that the bond between steel and concrete is perfect, permissible stresses of the materials are obtained. The basis of this method is that the permissible stresses are not exceeded any where in the structure when it is subjected to worst combination of working loads.
In this method, the ultimate strength of concrete and yield strength or 0.2% proof stress of steel are divided by factors of safety to obtain permissible stresses. These factors of safety take into account the uncertainties in manufacturing of these materials. As per IS456, a factor of safety of 3 is to be used for bending compressive stresses in concrete and 1.78 for yield/proof strength of steel.
Advantage of Working stress method of design:
- This technique is simple in calculation and simple to understand.
- This methodology provides the worst combination of loadings and higher efficiency throughout excessive conditions.
- The serviceability requirements are sufficient for the working stress method.
CLICK BELOW FOR MORE DETAILS
FOR MANY MORE UPDATES AVAILABLE CLICK BELOW
CLICK THE BELOW LINK TO READ THE COMPLETE CONTENTS
SOME CONTENTS OF THIS WEBSITE ARE FOR GOLD SUBSCRIBERS ONLY.
Join us as a GOLD SUBSCRIBER and get access to read important books.
We are going to close all what’s groups of CEV soon due to difficulties in posting information or message in more than 5 groups of CEV at a time.
All future posts of empanelment notices & professional importance will be shared on
3. The Twitter handle of CEV India
after closing the groups.
All members of these groups are requested to register themselves at the following link immediately for Getting all related timely updates…