ISO 28841:2013
Guidelines for simplified seismic assessment and rehabilitation of concrete buildings
The purpose of ISO 28841:2013 is to provide sufficient information to perform the seismic assessment and rehabilitation of the structural concrete building that complies with the limitations established in ISO 28841:2013, for both undamaged structures that are deemed not to comply with the required characteristics for an adequate response at a specified performance level, and for structures that have undergone damage under seismic loadings. The rules of design as set forth in ISO 28841:2013 are simplifications of more elaborate requirements.
ISO 28841:2013 can be used as an alternative to the development of a building code, or equivalent document in countries where no national design codes are available by themselves, or as an alternative to the building code in countries where specifically considered and accepted by the national standards body or other appropriate regulatory organization, and applies to the assessment of earthquake resistance capability and to the seismic rehabilitation design and construction for existing structural concrete buildings.
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1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Limitations
5.1 Occupancy
5.1.1 Permitted occupancy
5.1.2 Mixed occupancy
5.2 Maximum number of stories
5.3 Maximum aspect ratios
5.4 Maximum story height
5.5 Maximum difference in story height
5.6 Maximum difference in floor area
5.7 Maximum difference in story mass
5.8 Maximum column offset
5.9 Maximum span length
5.10 Maximum difference in span length
5.11 Maximum cantilever span
5.12 Maximum slope for slabs, girders, beams and joists
5.13 Maximum slope of the terrain
5.14 Distance between center of mass and center of rigidity
6 Assessment and rehabilitation procedure
6.1 Procedure outline
6.2 Data collection
6.3 Lateral load resisting system classification
6.4 Material assessment
6.5 Condition assessment
6.6 Structural assessment
6.7 Rehabilitation design
6.8 Rehabilitation construction
6.9 Design documentation
6.9.1 Assessment record
6.9.2 Rehabilitation calculation memoir
6.9.3 Geotechnical report
6.9.4 Structural drawings
6.9.5 Specifications
7 General Guides
7.1 Limit states
7.2 Ultimate limit state design format
7.2.1 General
7.2.2 Required factored strength
7.2.3 Design strength
7.3 Serviceability limit state design format
8 Classification of the structure system of the building
8.1 Concrete frame systems
8.2 Concrete wall systems
8.3 Concrete dual systems
9 Condition assessment of structures damaged by a seismic event
9.1 Material assessment
9.1.1 Material properties
9.1.2 Component properties
9.1.3 Test methods
9.1.4 Minimum number of tests
9.1.4.1 General
9.1.4.2 Comprehensive testing
9.1.4.3 Concrete materials
9.1.4.4 Reinforcing and connector steels
9.1.5 Soundness
9.2 Condition Assessment
9.2.1 Layout of structural damages
9.2.1.1 Flexural and shear cracks
9.2.1.2 Full-thickness versus partial-thickness cracking
9.2.1.3 Cracking as a precursor to spalling
9.2.1.4 Splitting cracks at lap splices
9.2.1.5 Crack widths
9.2.2 Damage levels
9.2.3 Layout of non structural damages
9.2.3.1 Mechanical equipment
9.2.3.2 Hydraulic and sanitary installations
9.2.3.3 Partition walls
9.2.3.4 Facade cladding
9.2.3.5 Window and facade glass
9.2.3.6 Parapets
9.2.3.7 Non structural damage levels
9.3 Structural assessment
9.4 Final assessment
10 Condition assessment of existing structures
10.1 Vulnerability level
10.2 Actual condition of the structure
10.3 Seismic hazard
10.3.1 No seismic hazard zones
10.3.2 Low seismic hazard zones
10.3.3 Intermediate seismic hazard zones
10.3.4 High seismic hazard zones
10.4 Architectural layout
10.4.1 Plan irregularity
10.4.2 Elevation irregularity
10.5 Foundation
10.6 Soil type
10.7 Quality aspects
10.7.1 Quality of design
10.7.2 Quality of materials
10.7.3 Quality of construction
10.7.4 Non structural elements
10.8 Structural assessment
10.9 Final assessment
11 Rehabilitation analysis and design
11.1 Concrete Frame Systems
11.2 Concrete wall systems
11.3 Concrete frames with concrete infills
11.4 Foundation rehabilitation
11.4.1.1 Types of foundations
11.5 Rehabilitation Measures for the structural system
11.5.1 Reinforced concrete jacketing
11.5.2 Shotcreting
11.5.3 FRP reinforcements
11.5.3.1 CFRP jacketing
11.5.3.2 GFRP jacketing
11.5.3.3 Steel jacketing
12 Rehabilitation construction
12.1 Demolitions and debris retrieval
12.2 Cover retrieval
12.3 Surface preparations
12.4 Adherence concerns
12.5 Durability concerns
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1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Limitations
5.1 Occupancy
5.1.1 Permitted occupancy
5.1.2 Mixed occupancy
5.2 Maximum number of stories
5.3 Maximum aspect ratios
5.4 Maximum story height
5.5 Maximum difference in story height
5.6 Maximum difference in floor area
5.7 Maximum difference in story mass
5.8 Maximum column offset
5.9 Maximum span length
5.10 Maximum difference in span length
5.11 Maximum cantilever span
5.12 Maximum slope for slabs, girders, beams and joists
5.13 Maximum slope of the terrain
5.14 Distance between center of mass and center of rigidity
6 Assessment and rehabilitation procedure
6.1 Procedure outline
6.2 Data collection
6.3 Lateral load resisting system classification
6.4 Material assessment
6.5 Condition assessment
6.6 Structural assessment
6.7 Rehabilitation design
6.8 Rehabilitation construction
6.9 Design documentation
6.9.1 Assessment record
6.9.2 Rehabilitation calculation memoir
6.9.3 Geotechnical report
6.9.4 Structural drawings
6.9.5 Specifications
7 General Guides
7.1 Limit states
7.2 Ultimate limit state design format
7.2.1 General
7.2.2 Required factored strength
7.2.3 Design strength
7.3 Serviceability limit state design format
8 Classification of the structure system of the building
8.1 Concrete frame systems
8.2 Concrete wall systems
8.3 Concrete dual systems
9 Condition assessment of structures damaged by a seismic event
9.1 Material assessment
9.1.1 Material properties
9.1.2 Component properties
9.1.3 Test methods
9.1.4 Minimum number of tests
9.1.4.1 General
9.1.4.2 Comprehensive testing
9.1.4.3 Concrete materials
9.1.4.4 Reinforcing and connector steels
9.1.5 Soundness
9.2 Condition Assessment
9.2.1 Layout of structural damages
9.2.1.1 Flexural and shear cracks
9.2.1.2 Full-thickness versus partial-thickness cracking
9.2.1.3 Cracking as a precursor to spalling
9.2.1.4 Splitting cracks at lap splices
9.2.1.5 Crack widths
9.2.2 Damage levels
9.2.3 Layout of non structural damages
9.2.3.1 Mechanical equipment
9.2.3.2 Hydraulic and sanitary installations
9.2.3.3 Partition walls
9.2.3.4 Facade cladding
9.2.3.5 Window and facade glass
9.2.3.6 Parapets
9.2.3.7 Non structural damage levels
9.3 Structural assessment
9.4 Final assessment
10 Condition assessment of existing structures
10.1 Vulnerability level
10.2 Actual condition of the structure
10.3 Seismic hazard
10.3.1 No seismic hazard zones
10.3.2 Low seismic hazard zones
10.3.3 Intermediate seismic hazard zones
10.3.4 High seismic hazard zones
10.4 Architectural layout
10.4.1 Plan irregularity
10.4.2 Elevation irregularity
10.5 Foundation
10.6 Soil type
10.7 Quality aspects
10.7.1 Quality of design
10.7.2 Quality of materials
10.7.3 Quality of construction
10.7.4 Non structural elements
10.8 Structural assessment
10.9 Final assessment
11 Rehabilitation analysis and design
11.1 Concrete Frame Systems
11.2 Concrete wall systems
11.3 Concrete frames with concrete infills
11.4 Foundation rehabilitation
11.4.1.1 Types of foundations
11.5 Rehabilitation Measures for the structural system
11.5.1 Reinforced concrete jacketing
11.5.2 Shotcreting
11.5.3 FRP reinforcements
11.5.3.1 CFRP jacketing
11.5.3.2 GFRP jacketing
11.5.3.3 Steel jacketing
12 Rehabilitation construction
12.1 Demolitions and debris retrieval
12.2 Cover retrieval
12.3 Surface preparations
12.4 Adherence concerns
12.5 Durability concerns