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An Improved Spread Plasticity Model For Inelastic Analysis Of R/C. Frames Subjected To Seismic Loading, 13th

Lookup NU author(s): Michael Kyakula, Professor Sean Wilkinson


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The Newton Raphson iteration procedure that uses these moment curvature hysteretic relationship to solve the displacement equation is unable to recognise a change in yield zone length after yielding because it does not result into a change of slope. Also it is unable to recognise yielding that starts within the span. Thus it is important to determine the location and length of the yield zone for realistic application of the spread plasticity model. A method to determine, more accurately, the length, and location of yield zones is presented together with an Example showing the effect of determining more accurately the lengths and locations of yield zones on the structural deformations. The example among other points demonstrates that by recognising the location of yield zones in the span before they extend to the support, a 77% improvement in the accuracy of the moment rotation curve for the joint under sagging moment is achieved. Also a 25% improvement in the load deflection curve is achieved

Publication metadata

Author(s): Kyakula M, Wilkinson SM

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Unknown

Conference Name: World Conference on Earthquake Engineering

Year of Conference: 2004