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IS 13827:1993 is the Indian Standard (BIS) for improving earthquake resistance of earthen buildings - guidelines. This standard provides guidelines for improving the earthquake resistance of new and existing earthen buildings, such as those made from adobe or rammed earth. It focuses on appropriate site selection, planning, material quality, and specific strengthening techniques like providing horizontal ring beams (bands) and vertical reinforcement to enhance structural integrity during seismic events.
Provides guidelines for improving the earthquake resistance of earthen buildings.
Overview
Status
Current
Usage level
Specialized
Domain
Structural Engineering — Disaster Resilience and Retrofitting
! The provision of continuous horizontal bands (lintel band, roof band) is the single most important measure for tying the structure together and preventing wall collapse.
! Pay close attention to connections: wall-to-wall, wall-to-foundation, and wall-to-roof are common points of failure.
! The quality of the soil is critical. Use the simple field tests described in Annex A to assess soil suitability before construction.
Provides engineering design methods for new earth buildings, covering similar materials and seismic principles.
Norma Técnica de Edificación E.080:2017SENCICO (Servicio Nacional de Capacitación para la Industria de la Construcción), Peru
HighCurrent
Diseño y Construcción con Tierra Reforzada (Design and Construction with Reinforced Earth)
Specifies design and construction requirements for adobe in a high-seismic region, focusing on reinforcement.
Guidelines for Earthquake Resistant Non-Engineered ConstructionIAEE (International Association for Earthquake Engineering) & World Bank
HighCurrent
Guidelines for Earthquake Resistant Non-Engineered Construction
Provides prescriptive guidelines for improving seismic resistance of various construction types, including adobe.
14.7.4 NMAC 2021New Mexico Construction Industries Division, USA
MediumCurrent
New Mexico Earthen Building Materials Code
A state-level code for new earthen construction (primarily adobe) with specific seismic provisions.
Key Differences
≠IS 13827 is a prescriptive 'guideline', while standards like NZS 4297 are 'engineering design' codes requiring detailed calculations for structural capacity and stability.
≠IS 13827 focuses on 'improving' resistance, making it suitable for both new construction and retrofitting, whereas NZS 4297 and the NMEBC are primarily for the design of new buildings.
≠International standards like NZS 4297 and Peru's E.080 often mandate more specific and rigorous material testing protocols (e.g., for soil quality, block strength, moisture content) than the general requirements in IS 13827.
≠While IS 13827 allows for wood or RC bands, Peru's E.080 is highly specific about the use of reinforced concrete ring beams ('vigas de collar') to ensure ductile behavior.
Key Similarities
≈All standards strongly emphasize the need for horizontal bands (plinth, lintel, and/or roof level) to tie the walls together and ensure integral box action during an earthquake.
≈There is a common consensus on providing vertical reinforcement, particularly at corners and wall T-junctions, to prevent wall separation and improve stability.
≈All guidelines stress the importance of good building configuration, advocating for simple, symmetrical rectangular plans and avoiding complex shapes like L, T, or U plans to minimize torsional effects.
≈Each standard places strict limits on the size, number, and location of openings (doors and windows) in walls to ensure sufficient shear strength in the wall piers.
Parameter Comparison
Parameter
IS Value
International
Source
Wall Height-to-Thickness Ratio (Slenderness)
≤ 10
≤ 8 for bearing walls
Norma E.080 (Peru)
Minimum Compressive Strength (Adobe Block)
1.0 N/mm² (MPa)
1.0 MPa (characteristic strength)
NZS 4297:2020
Total Length of Openings in a Wall
≤ 50% of wall length (single-storey)
≤ 40% of wall length
Norma E.080 (Peru)
Minimum Pier Width (between opening and corner)
≥ 450 mm
≥ 600 mm or wall thickness, whichever is greater
NZS 4297:2020
Lintel/Ring Beam Width
Full thickness of the wall
Equal to the thickness of the wall ('ancho igual al espesor del muro')
Norma E.080 (Peru)
Maximum Number of Storeys (High Seismic Zone)
1 (for Zones IV & V)
1 (unless specific engineering analysis is performed)
Norma E.080 (Peru)
Minimum Depth of RC Lintel Band
75 mm
150 mm (for 'viga de collar' ring beam)
Norma E.080 (Peru)
⚠ Verify details from original standards before use
Key Values7
Quick Reference Values
Maximum recommended building heightTwo storeys plus attic (Clause 4.1.2)
Maximum wall length between cross-walls6.5 m (Clause 4.3.1)
Minimum wall thickness for single storey building300 mm (Table 1)
Minimum wall thickness for ground floor of two-storey building400 mm (Table 1)
Maximum total length of openings in a wall50% of wall length for single storey (Clause 4.4.1)
Minimum distance of opening from corner1/4 of wall height, but not less than 600 mm (Clause 4.4.1)
What is the most critical feature for making an earthen house earthquake-resistant?+
Providing continuous horizontal bands (e.g., lintel band) made of wood or reinforced concrete to tie the walls together and ensure they act as one unit (Clause 8.2).
What is the maximum height for an earthen building in a seismic zone according to this code?+
Preferably single-storey. Up to two storeys with an attic is permissible if all strengthening measures are incorporated (Clause 4.1.2).
Are large window or door openings allowed in earthen walls?+
No, openings should be kept small and few. The total length of openings in a wall should not exceed 50% of the wall length for a single-storey building (Clause 4.4.1).
What kind of foundation is recommended for earthen buildings?+
A strong, non-erodible foundation made of burnt bricks, stone masonry, or concrete should be used, extending at least 300 mm above ground level (Clause 6.1).