Seismic Response Analysis of RC Shell Structures: A Parametric Study of Span and Rise Variations Across Different Seismic Zones

Rishabh Panwar; Sanjay Limbodiya; Priyanka Rajput

Seismic Response Analysis of RC Shell Structures: A Parametric Study of Span and Rise Variations Across Different Seismic Zones

Author(s)	Mr. Rishabh Panwar, Prof. Sanjay Limbodiya, Prof. Priyanka Rajput
Country	India
Abstract	Concrete shells have been widely used for roofing large column-free areas and have been constructed in various countries for almost half a century. The objective of the present work is to compare the behaviour of RC shell structure having different geometrical parameters under seismic forces. For this purpose a multi frame RC shell structure having single storey is considered. For analysis central rise and span of RC shell structure are considered having variations in parameters. The analysis is carried out with the help of software Staad.Pro. The total 12 models are to be compared in seismic zone III, zone IV and zone V.Details of the models considered for analysis are plan area A : 18m x 24m, column grid A : 6m x 4m, plan area B : 24m x 24m, column grid B : 8m x 4m, height : 6m, size of beams : 300mm x 600mm, size of columns : 400mm x 400mm, thickness of shell : 200mm. Shell is supported by columns through edge beams.Material properties for the analysis are density: 25 KN/m³, poisons ratio: 0.2, modulus of elasticity: 5000√fck, grade of concrete: M-20, grade of steel: Fe-500. To study the seismic behavior of RC shell structure the result parameters selected are maximum deflection, maximum moments and shear stresses. From the result analysis it is observed that in all the models deflection, moments and shear stress values are less for lower zones and it goes on increasing for higher zones because the magnitude of intensity will be the more for higher zones.In a RC shell structure if span is same but central rise is varying, then the deflection values increases with increase in rise when earthquake forces governs but in case of gravity forces deflection values decreases with increase in rise in all the zones considered, also the moment values and shear stress values decreases with increase in rise for all the load cases in all the zones considered.In a RC shell structure if central rise is same but span is varying, then the deflection values increases with increase in span for all the load cases, also the moment values and shear stress valuesincreases with increase in span for all the load cases in all the zones considered.
Keywords	Concrete Shells, Deflection, Moment, Shear Stress.
Field	Engineering
Published In	Volume 8, Issue 2, March-April 2026
Published On	2026-04-17

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Seismic Response Analysis of RC Shell Structures: A Parametric Study of Span and Rise Variations Across Different Seismic Zones

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