The 2010 edition of IS 15917 outlines detailed procedures and standards for designing and erecting buildings utilizing mixed or composite construction techniques within India. It encompasses aspects such as modular layout, sizing of components, joint detailing, and construction methodologies involving materials like precast concrete, steel, timber, and masonry. This code is vital for professionals engaged in hybrid construction to ensure safety, structural soundness, and efficient assembly.
Overview
The 2010 edition of IS 15917 outlines detailed procedures and standards for designing and erecting buildings utilizing mixed or composite construction techniques within India. It encompasses aspects such as modular layout, sizing of components, joint detailing, and construction methodologies involving materials like precast concrete, steel, timber, and masonry. This code is vital for professionals engaged in hybrid construction to ensure safety, structural soundness, and efficient assembly.
Audience
Contents
Structure
IS 15917 defines the extent covering design, materials, and construction directives for formwork frameworks used in concrete structures. It references related Indian Standards (detailed in Annex A) for material tolerances and testing. Tolerance limits for steel and masonry formwork components are specified in relevant IS codes such as IS 2502 and IS 2212. Numerical results from tests or calculations should be rounded according to IS 2:1960 guidelines, preserving significant digits. The key parameters for formwork systems include material tolerances, rounding rules, and referenced standards, all detailed within Clause 7 and Annex A.
Defines key terms such as 'Unit' referring to building materials with specified three-dimensional measurements intended as single entities or parts of composite units. Examples include bricks, blocks, and tiles. Rounding off procedures for test values follow IS 2:1960, ensuring consistent significant figures are maintained. Practical guidelines for concrete placing and finishing are also outlined, emphasizing parameters like discharge height and power floating timelines.
Describes the use of a basic module (M) standardized at 100 mm to streamline dimensional coordination across building components. This approach reduces size variety and enhances flexibility in layout. Components are designed in multiples of M (e.g., 2M = 200 mm). IS 15916 serves as the primary reference for detailed modular coordination requirements. The general formula for dimensioning is Dimension = n × M, where n is an integer multiplier.
Details requirements for materials, emphasizing compliance with relevant Indian Standards. Building units (such as bricks and tiles) must meet quality and dimension criteria. Planning and specifications should adhere to IS 15916:2010, covering workmanship, tolerances, and equipment. The section also lists related IS codes pertinent to design and construction, providing unit weights for common materials as a quick reference.
Refers to IS 15916 for comprehensive guidelines on modular coordination, architectural detailing, and surface finishes. Emphasizes the use of basic modules to minimize size variations and improve design adaptability. Architectural treatments cover surface finishes, joint detailing, and material compatibility, all aimed at achieving standardized and durable construction outcomes.
Focuses on preferred element dimensions and allowable casting tolerances, directing users to IS 15916 for precast concrete elements. Tolerances for steel, masonry, and timber adhere to respective IS codes and SP 7 guidelines. Typical tolerance ranges include length/width variations of ±3 to ±5 mm and hole positions within ±2 mm. Visual aids illustrate nominal dimensions alongside permissible deviations.
Highlights various formwork systems such as Tunnel Form, Aluminium Formwork, and Large Panel Shuttering. Tunnel Form enables simultaneous casting of walls and slabs using steel components, facilitating rapid construction. Aluminium Formwork is lightweight and rust-resistant, suitable for multiple building elements. Large Panel Shuttering combines steel verticals with plywood and timber horizontals. Design considerations include load calculations, permissible deflections, and safety factors in compliance with IS 456 and IS 15916.
Discusses the flexibility of structural systems that utilize common component sets, emphasizing the need for orderly and disciplined assembly. Approval from authorities is mandatory for introducing new or alternative systems. Designs must accommodate service installations and ensure compatibility with formwork and structural elements. Permissible tolerances follow relevant Indian Standards. Typical structural components include columns, beams, slabs, joints, and formwork systems.
Outlines design references including IS 3935 for composite construction, IS 3201 for precast trusses, and various IS codes for precast floors and roofs. Load considerations cover dead, live, wind, snow, and seismic effects per IS 875 and IS 1893. Formwork and construction practice emphasize space efficiency, simplified walling, standardized services, and ease of erection. Testing and sampling procedures adhere to IS 15916.
Details requirements for manufacturing, storing, transporting, and erecting precast concrete elements as per IS 15916. References to composite construction and precast trusses are included. Equipment used must meet IS 15916 standards. The section provides typical specifications for each activity and load considerations during transport and erection. A general formula is provided for calculating stresses during lifting.
Specifies best practices for supporting reinforcement using robust plastic stools, loops, or mesh chairs to prevent displacement during concreting; plastic channels are discouraged. Emphasizes inspection after fixing, especially near openings and additional bars. Concrete placement should minimize decking deformation, with defined sequences for pouring parallel or perpendicular to decking ribs. Compaction methods involve vibrating beams or immersion needle vibrators, avoiding hand tamping.
Describes procedures for securing decking sheets to supporting structures with specified fixing centers. End supports require fixings at every trough (~300 mm), internal supports at alternate troughs (~600 mm), with at least two fixings per sheet per permanent support. Fixings combined with welded studs provide lateral stability. Concreting guidelines include placement sequencing and compaction methods. Relevant IS codes for design and construction of composite floors and roofs are referenced.
Lists the Indian Standards referenced in IS 15917 related to design loads, earthquake resistance, precast components, composite construction, and equipment for precast concrete. Highlights standards such as IS 875 (loads), IS 1893 (seismic), IS 3935 (composite construction), IS 3201 (precast trusses), IS 15916 (equipment), and others covering various precast floor and roof systems. Notes on material conformity and equipment compliance are included.
Details fixing methods for decking sheets, requiring fixings through troughs at specified intervals on end and internal supports, with a minimum of two fixings per sheet per permanent support. Fixings on temporary supports are prohibited. The combination of fixings and welded studs ensures lateral restraint. Guidance on sheet placement includes minimum bearing lengths, joint gaps, overlaps, and handling of cut-outs and scrap disposal.
Specifies the sequence for concrete placement on decking, advising pouring first over supports, then mid-span, and finally at end supports for spans exceeding 3 meters. When placing transverse to ribs, starting at edges supported by adjacent sheet underlaps is recommended. Compaction must be done using vibrating beams or immersion needle vibrators, avoiding hand tamping. Fixing details and lateral restraint during concreting are reiterated. Related IS codes for composite and precast floors and roofs are referenced.
Frequently Asked
IS 15917:2010 authorizes a variety of materials for mixed/composite construction, including concrete (standard, lightweight, and cellular), ferrocement, steel, treated timber, aluminium, and ceramic products. The code encourages employing prefabricated components from these materials and covers their combinations in composite systems. For concrete-based prefabrication, IS 15916:2010 provides complementary guidance. This material diversity facilitates innovative and efficient hybrid building systems.
IS 15917 aligns its modular coordination provisions with IS 15916, defining modular coordination as the use of a basic module or multimodule to minimize component size variety and enhance arrangement flexibility. It focuses on prefabricated elements encompassing planning, sizing, joint design, manufacturing, storage, transport, and erection. The standard promotes using standardized modules to ease design, production, and assembly processes.
IS 15917 advises supporting reinforcement with sturdy plastic stools, loops, or preformed mesh chairs to prevent displacement during concreting, avoiding plastic channels that can cause cracking. It stresses thorough inspection after fixing, particularly around openings and additional bars. Concrete placement should minimize decking deformation, following a specific sequence depending on the orientation relative to decking ribs. Compaction should utilize vibrating beams or immersion needle vibrators, with hand tamping discouraged, to ensure structural integrity and composite action.
Joint and connection design under IS 15917, referencing IS 15916, must ensure resistance to loads from discrete system forces, horizontal loads in two orthogonal directions, and account for end supports, construction stage stresses, handling, erection, and impact loads per IS 875 and IS 1893. Construction joints should be located near decking butt joints to prevent cracking and ensure sound concrete around shear connectors, employing stop ends to avoid grout loss. Temporary stability during erection is achieved through appropriate propping and mechanical connectors. Practical design also considers component size, weight limits, erection safety, and tolerance adherence.
IS 15917 covers modular, prefabricated, and systems-building construction methods focusing on mixed/composite structures. It includes modular planning, component sizing, joints, manufacture, storage, transport, and erection of prefabricated elements. The formwork systems detailed include the Tunnel Form System, which allows casting walls and slabs simultaneously using steel components for rapid construction and early stripping. The code also references aluminium formwork and large panel shuttering systems, with tolerances governed by relevant Indian Standards.
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