Strain energy based frequency independent impedances of soil for interaction effect on structure

Venkata Lakshmi Gullapalli , Raghunandan Kumar R. , G.R. Reddy

Abstract

The present study proposes a strain energy–based method for evaluating soil–structure interaction (SSI) effects for ground-mounted parabolic antenna systems founded on layered soils. Conventional frequencyindependent impedance formulations, such as those recommended in ASCE 4-16, are primarily based on homogeneous soil assumptions and may not adequately capture the dynamic behavior of layered soil profiles. In this work, a strain energy equivalence approach is developed to estimate translational and rotational soil impedances by accounting for depth-wise variations in soil stiffness. The proposed method is validated using three-dimensional finite element modeling and in-situ microtremor measurements. The results demonstrate improved prediction of natural frequencies and modal mass participation factors compared to standard impedance-based approaches, indicating that the proposed method provides a more realistic representation of SSI effects for precision-sensitive antenna structures.

Key Words

microtremor test; natural frequency; parabolic antenna; soil impedance; soil–structure interaction; strain energy principle

Address

Venkata Lakshmi Gullapalli and Raghunandan Kumar R. — Department of Civil Engineering, CHRIST University, Bangalore, Karnataka, India
G.R. Reddy — Department of Structural Engineering, VNIT, Nagpur, Maharashtra, India

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