The 1988 edition of IS 2210 delineates detailed design principles for reinforced concrete shell and folded plate structures, emphasizing structural analysis, load considerations, reinforcement detailing, and stability criteria. It serves as a pivotal reference for engineers and designers involved with thin shell roofs, cylindrical and doubly-curved shells, and folded plate constructions, facilitating safe and economical designs aligned with Indian standards.
Overview
The 1988 edition of IS 2210 delineates detailed design principles for reinforced concrete shell and folded plate structures, emphasizing structural analysis, load considerations, reinforcement detailing, and stability criteria. It serves as a pivotal reference for engineers and designers involved with thin shell roofs, cylindrical and doubly-curved shells, and folded plate constructions, facilitating safe and economical designs aligned with Indian standards.
Audience
Contents
Structure
This section outlines the simplified analysis procedures for circular cylindrical shells utilizing tabulated data (Appendix B). It includes tools for determining stresses, moments, and buckling parameters with key notations and fundamental formulas essential for design verification.
Defines critical symbols and parameters, presents a detailed classification of shell forms such as singly-curved and doubly-curved shells, and specifies reinforcement spacing requirements as per the code.
Provides an exhaustive list of geometric, material, stress, and force notations used throughout the standard, along with key equations for flexural rigidity and bending stress analysis.
Explains the classification of shells based on curvature and membrane behavior, illustrating types like developable singly-curved shells and non-developable doubly-curved shells, with guidance on reinforcement spacing.
Details the properties of concrete and steel reinforcement, including moduli of elasticity, characteristic strengths, and formulas for calculating flexural rigidity and bending moments.
Describes the appropriate load types as per IS 875, including dead, live, wind, snow, and seismic loads, with recommended load combinations for design and provisions for concentrated loads.
Specifies essential geometric parameters such as thickness, radius of curvature, rise, and depth, along with their influence on flexural rigidity and design stresses.
Outlines various analytical approaches including classical methods, beam method, finite element, and finite strip techniques for different shell and folded plate configurations.
Summarizes permissible stress values for concrete and reinforcement steel referencing IS 456, and describes the process of calculating stresses from deflections and stress functions.
Covers load assumptions on traverses, methods to resolve shear forces, effective widths of shell participation, connection details, and allowances for thermal movements.
Explains the role of edge beams in stiffening shell edges, their dimensional guidelines, reinforcement design considerations, and compatibility with shell boundary conditions.
Describes minimum reinforcement criteria, design formulas, bar spacing, layering, welding provisions, and uniform distribution requirements to ensure structural integrity.
Presents advanced classification schemes for stressed skin surfaces, including detailed tables and criteria for reinforcement spacing and buckling considerations.
Contains tabulated data for stress resultants and moments, outlines two-stage analysis methods, and discusses folded plate approximations and advanced numerical techniques.
Provides membrane and bending analysis governing equations, including equilibrium relations and stress function formulations for doubly-curved shells.
Frequently Asked
IS 2210 encompasses design criteria for various reinforced concrete shell structures such as cylindrical shells with single curvature, doubly-curved shells including domes and hyperbolic paraboloids, ruled surfaces like conoids, and folded plate systems. Each type is characterized by its geometric and structural behavior and is addressed with appropriate design guidance within the standard.
Loads including live, wind, snow, and seismic effects must be considered per IS 875 Parts 1 to 4. Design should follow prescribed load combinations such as dead plus live or snow loads, dead plus live plus wind, and dead plus live plus seismic loads. For complex dynamic or irregular conditions, advanced analysis methods like the Finite Element Method are recommended to accurately capture shell behavior under these loads.
IS 2210 recommends beam theory methods for cylindrical shells, especially when the length-to-radius ratio exceeds the width between traverses. Membrane analysis suffices for deep doubly-curved shells, whereas shallow doubly-curved shells require bending analysis. For complex geometries or loading conditions, numerical techniques such as the Finite Element Method or the Finite Strip Method provide enhanced accuracy.
Folded plates should have a minimum thickness of 75 mm, with preliminary depth approximately equal to the span divided by 15 for V or trough shapes. Reinforcement bars of at least 8 mm diameter are to be placed in compression zones at roughly 200 mm center-to-center spacing. These measures ensure adequate stiffness and moment resistance according to IS 2210.
Edge beams are designed to stiffen shell edges and share loads, with vertical beams suited for long cylindrical shells and horizontal beams for short ones. Traverses carry self-weight, shell reaction shear forces, and direct loads, often modeled as uniformly distributed vertical loads for preliminary design. Design provisions include resolving shear into components, effective shell widths for interaction, and allowances for thermal expansion and contraction, with traverses typically hinged at columns unless integrated into rigid frames.
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