Plastic Bending of Portals Experiment Report

Experimental objectives

• Is to forecast the bending moment diagram, collapse load, the number, and the position at which plastic hinges for the portal are formed
• To compare the predicted values with the experimental values found from the experiment and do analysis
• To determine dislocation, failure mode, and not directly member forces in a portal subject to mounting perpendicular and tangential loading

Theoretical Background

Modern engineering plan is founded on the “Elastic Theory of Bending” and the technique is to compute the utmost stresses, which crop up and maintain them in the limit of operational stresses in both tension and compression. These functional stresses are computed from a “factor of safety” and ultimate/yield stress. However, according to Sivakumar(2008), this way of computing is a bit impractical because “Mild Steel Structures do not fail when thew edge Stress of any cross-section reaches the Yield point and will continue to withstand the load as long as the central core of the section remains within the Elastic State”(p. 3).