Abstract
Objectives: To analyze the soil structure interaction (SSI) behaviour of a geodesic dome for in situ soil conditions by using the response spectrum method (RSM). Methods: An existing geodesic dome of diameter 31m and a total height of 23.6 m is modeled using SAP2000, and the model is evaluated for the soil structure interaction. The existing geodesic dome structure falls under seismic zone II according to IS: 1893-2016, so the in-situ soil properties of the structure are considered to design the soil springs. Findings: Base shear in SSI condition observed 3.72 % lesser compared to the nonSSI conditions and natural time period, has been increased to 60.8% compared to nonSSI as it affirms the flexibility of the geodesic dome. Novelty: The present study aims to evaluate the dynamic behavior of the geodesic dome, which is a nonconventional structure in design and shape. Few investigations were carried out to analyze the soil structure interaction behavior on such structures. Keywords: Soil structure Interaction; geodesic dome; response spectrum method; SAP2000; dynamic behaviour
Highlights
Domes are one of the oldest types of architectural coverings
The total horizontal force is referred to as base shear, which is mainly based on structural mass, natural time period, and modal shape
A 3.72% reduction is observed in the base shear for soil structure interaction (SSI) compared to the non-SSI condition (Fixed base) and the V zone shows maximum base shear value compared to the other Zones
Summary
Attempts were made in ancient times to cover larger areas with dome constructions. They were full-walled, continuous domes, and it wasn’t until the early 19th century that iron and steel technology allowed the creation of reticulated domes, such as strut domes[1]. The construction and assembly of individual elements of a geodesic dome are much easier compared to conventional structural works[2]. Structural analysis on an inverted monk bowled shape single layer geodesic steel dome performed by Naveed Anwar [3], it is modeled and analyzed for wind and seismic loads using the response spectrum method, the design forces are determined with respect to the structural components and construction loads. A shake table test is performed on a single layer reticulated dome by Gui-boNie[4], to study the dynamic behavior of the proposed model under white noise excitation and fast size frequency to exhibit the natural frequency and
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