International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 04 | Apr 2024
p-ISSN: 2395-0072
www.irjet.net
COMPARATIVE SEISMIC ANALYSIS OF K8 KIWIETT RETICULATED DOME STRUCTURE, K8-Ribbed HYBRID AND DOME STRUCTURE WITH OPENING Kruti Jani, Dipak Jivani P.G Student, Dept. of Civil Engineering, Darshan University, Gujarat, India Professor, Dept. of Civil Engineering, Darshan University, Gujarat, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Reticulated dome structures are the preferred
the dome's crown. Here’s the pattern involves K8 Kiewitt, K8 Kiewitt-Ribbed Hybrid and K8 Kiewit dome with opening.
choice for large spanned structures. The analysis and design of these dome structures differ significantly from low-rise dome structures due to lateral forces caused by wind and earthquakes. The dome structure system features rigid connections between members and fixed hinge bearings. This study focuses on the seismic behavior of dome structure patterns, specifically Kiewitt-8, Kiewitt-Ribbed Hybrid(K8), and Dome with opening, to identify structural efficiency. These domes resist both gravity and lateral loads through axial action of the members. The span length of 60m with various h/s ration 0.20, 0.25,0.30, 0.35 are considered for the study and design purposes. Earthquake parameters are based on IS 1893-2016. The analysis of dome structure systems will be carried out using the Sap2000 analysis and design software. This research examines a set of structures using reticulated Kiewitt dome structures with three different patterns for varying rise-to-span ratios. The seismic behavior of these different reticulated Kiewitt dome models is compared based on vertical rare earthquake loads in terms of Response, time period, base reaction, P-delta effect, plastic hinge patterns, and failure mechanisms of the dome structure.
The nonlinear dynamic response history analyses were conducted on a reticulated dome at various seismic record magnitudes to calculate collapse loads. Ming Zhang (2019) compared different types of reticulated domes in terms of material efficiency by analyzing weight, stress, and buckling constraints. Parvathy K.T (2020) determined the maximum lateral force under seismic loading through analysis, while F. Fan (2018) conducted finite element analysis to study plasticity spread and node displacement under seismic loading. Feng Fan (2014) conducted parametric analyses on a single-layer reticulated dome under seismic load, showing an increase in limit load with decreasing rise-span ratio, roof mass, and initial defects. FAN Feng (2008) discussed the Hamilton variation principle and central difference method for solving non-linear dynamic problems. Different failure modes were identified for a single-layer Kiewit reticulated dome under impact loads based on vertical displacement, stress, and plastic deformation.
1.1 BUILDING CONFIGURATION
Key Words: Reticulated dome, Kiewitt dome structure, rise to span ratio, p-delta analysis, plastic hinge.
The structural patterns of the reticulated dome modal Kiewitt are K8 Kiewitt, K8 Kiewitt-Ribbed Hybrid and K8 Kiewit dome with opening. being considered for analysis. A total of 16 models are being analyzed and designed with rise to span ratios of 0.20, 0.25, 0.30, 0.35, and spans of 60m. The first step involves analyzing and designing all structures, followed by comparing the results for different dome patterns and h/s ratio. The typical plan and elevation can be seen in figure given. Dead load, live load, and earthquake load cases are taken into account for the analysis and design. The modelling, analysis, and design of all reticulated dome models are being conducted using SAP2000 software. For linear static analysis and design, beam elements and braces are modeled using truss elements. The support conditions are assumed to be hinged supports, and all structural members are designed according to IS 800:2007.
1.INTRODUCTION Spatial structures have been widely utilized in the construction of various large span structures over the last few decades, including aircraft hangars, exhibition halls, stadia, airport terminals, gymnasia, bridge systems, railway platform shelters, shopping malls, and atriums. These structures are known for their aesthetic appeal and engineering efficiency, enabling them to cover extensive spans. The installation of a reticulated dome's main structure can be completed rapidly in just a few hours, as opposed to the months or years required for heavier structures. There is no evidence to suggest that well-designed domes have experienced any issues or damage from wind or typhoons. A reticulated dome is a type of spatial structure that resembles a section of a sphere, constructed from a grid of triangles that form a spherical surface. The more triangles used, the closer the dome resembles a perfect sphere. The pattern of a Kiewitt dome consists of subdivided triangles along the circumferential direction, all meeting at a common vertex at
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