Abstract
As inferred from earthquake engineering literature, considering soil structure interaction (SSI) effects is important in evaluating the response of transmission line towers (TLT) to dynamic loads such as impulse loads. The proposed study investigates the dynamic effects of SSI on TLT behavior. Linear and non-linear models are studied. In the linear model, the soil is represented by complex impedances, dependent of dynamic frequency, determined from numerical simulations. The nonlinear model considers the soil non-linear behavior in its material constitutive law and foundation uplift in a non-linear time history analysis. The simplified structure behavior of a typical lattice transmission tower is assessed. The analysis of frequency and time domain are followed through varying soil stiffness and damping values. Three different shock durations are investigated. The soil-structure system with equivalent dynamic properties is determined. The behaviors achieved utilizing a rigid and a flexible base for the structures is compared to estimate the impact of taking SSI into account in the calculation. The current mainstream approach in structural engineering, emphasizing the importance of the SSI effect, is illustrated using an example where the SSI effect could be detrimental to the structure. Furthermore, the non-linear analysis results are analyzed to show the linear approach’s limitations in the event of grand deformations.
Highlights
Transmission line structures are commonly modeled with fixed base assumption neglecting the foundations flexibility
TL structures, which are built on overexposed area, are designed to support important dynamic loads suchlike those resulting from a conductor breakage [3]
The soil is substituted in this article by dynamic frequency dependent and complex impedances derived from numerical simulations [17] using the FLAC (Itasca 2005) program, which are in good agreement with the solutions developed by [18]
Summary
Transmission line (hereinafter referred to as TL) structures are commonly modeled with fixed base assumption neglecting the foundations flexibility This assumption is debatable given the recognized importance of soil-structure interaction (hereinafter referred to as SSI) in different fields of structural engineering [1] such as earthquake engineering [2] and more widely under dynamic loadings. Several studies have already investigated the soil flexibility effect on the structure response associated to foundation uplift [8,9,10] have modeled the underlying soil by spring-dashpot elements distributed without tension. A detailed analysis of dynamic effects with non-linear SSI and foundation uplift is required to predict the transient reaction of TL towers to abrupt conductor rupture. The foundation displacements and resistance force are presented as results, are correspondingly compared to the linear response
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