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 …………
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