Abstract
The Experimental investigations have revealed significant mismatches between analytical estimates and experimentally measured deflections of tower structures. Conductor and groundwire tension and sag are influenced by the peak and cross-arm deflections and hence accurate estimates of the tower deflections at service loads are of key interest. This paper presents a nonlinear formulation for analysis of tower structures in an attempt to close the mismatch. The analysis includes geometric nonlinear behaviour of the tower, material nonlinearity as well as leg member buckling in compression. The nonlinear analysis reveals that the ultimate collapse loads of the towers tested to failure can be predicted. However the, deflections continue to have a mismatch despite nonlinear analysis. This demonstrates the need for inclusion of other parameters to be able to reduce the error of analytical deflection estimates.
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