Failure analysis of lattice tower like structures

International Conference on Civil Engineering and Infrastructural Issues in Emerging Economies 2017

土木建筑工程;经济学

Ramalingam, Raghavan^1

School of Civil Engineering, SASTRA University, Thanjavur

613 401, India^1

关键词: Analytical estimates;    Experimental investigations;    Geometric non-linear;    Lattice towers;    Material non-linearity;    Member buckling;    Nonlinear formulation;    Tower structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/80/1/012024/pdf
DOI  :  10.1088/1755-1315/80/1/012024

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

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.