SEISMIC PERFORMANCE OF MASONRY BUILDINGS...
Transcript of SEISMIC PERFORMANCE OF MASONRY BUILDINGS...
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SEISMIC PERFORMANCE OF MASONRY BUILDINGS AND SEISMIC
CONSTRUCTION TECHNIQUES
SEISMIC RESILIENT SCHOOL BUILDING CONSTRUCTION OF SCHOOL BUILDINGS FOR SUB-ENGINEER
R.K. MALLIK Structural Engineer RND CENTRE PVT. LTD.
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Session Objective
Participant will able to
– List School Building typology
– Understand typical damage pattern
– Understand theoretical background of damage
– Know Construction ideas to avoid damage
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SCHOOL BUILDING TYPOLOGY
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Structural Categories And Typology
LOAD BEARING MASONRY (LB)
RC FRAME WITH INFILL (RC FRAME)
STEEL FRAME (SF)
TIMBER (T)
Structural Categories Structural Typology
ADOBE (A)
UNCONFINED MASONRY / UNREINFORCED MASONRY
(UCM/URM)
CONFINED MASONRY
NON ENGINEERED RC WITH INFILL
SMRF WITH INFILL
STEEL FRAME MASONRY INFILL
TIMBER ROOF, MASONRY
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Brick in cement
Brick in mud
Stone in mud mortar with cement pointing
Photo credit: Arup
MASONRY WALL TYPE
Rubble masonry wall
Round Stone cut in half
Dressed Stone masonry wall(Ashlar Masonry)
Undressed Flat stones used in a dry stone wall
Semi Dressed Masonry
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DIFFERENT TYPOLOGY
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Field Stone in Mud Mortar Rectangular blocks in mud mortar
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Unconfined and Unreinforced masonry (UCM/URM): Rectangular blocks in cement mortar
Examples of brick in cement mortar buildings ( At Tanahu)
Photo credit: Arup
Fired brick in cement mortar are the most common
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Unconfined and Unreinforced masonry (UCM/URM): Rectangular blocks in mud/cement mortar with seismic
Example of RC lintel
Timber tying elements Cast-in-place concrete lintel bands to provide more overall continuity in the structural system.
Example of traditional building with timber tying elements
Arup
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Reinforced Concrete frame with masonry infill walls (Non-Engineered), (RC)
Examples of non-engineered RC Frame buildings
Photo credit: Arup
Photo credit: Arup
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Reinforced Concrete frame with and without masonry infill walls (Engineered), (RC-MF)
Designed with following IS 456;2002 and following ductile detailing code IS 13920
Lincon School, kathmandu
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Metallic -Steel Frame with CGI Roof and masonry walls
Examples of Steel Frame
Photo credit: Arup
Photo credit: Arup
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Masonry Building Timber Post and Rafters
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Typology Definitions – Combined Systems (CS)
Examples of combined (or mixed) typologies
Define in different pieces and define different structural categories for each floor for mixed systems in elevation. Use different form for each pieces
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DAMAGES IN GORKHA EARTHQUAKE
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Overall Percentage Of Different Typology
Proportion of school buildings per structural typology in the eight districts of Phase 1
LB: Load-bearing Masonry RC: Reinforced concrete SF: Steel frame TF: Timber frame
Reference: SIDA summary report of
Phase 1
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Damages: Buildings per typology
Reference: SIDA summary report of Phase 1
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MASONRY BUILDING THEORETICAL BACKGROUND OF
DAMAGES
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Causes of Failure of Masonry Buildings
Inadequate integrity
Inadequate out of plane flexure capacity
In adequate In-Plane shear resistance
irregular configuration
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Behavior of Masonry Buildings
Masonry Building Components
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Ref: IITK EQ Tips
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Behavior of Masonry Buildings
If No proper Connection, Wall B Tends to fail
Advantage of proper Connections
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Ref: IITK EQ Tips
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Lack of integrity( Corner Separation followed by out of plane failure)
21 Corner Separation Leads to out of plane failure
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Improvement of Connection
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Step joint
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Alternating toothed joint
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RC STITCH
Stitch spacing 600 mm
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Long Wall and Short wall
Slenderness Ratio= H/t If H/t> 12, Wall is slender
Height and length of the wall should be kept in a limit to avoid off plane failure
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Buttress for Long Wall
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Effect of Openings
Load transfer zone from weak wall to strong wall
Opening Weakens Walls Single closed band must be provided above openings
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Crack Around opening and Wall behavior modified
Cracking of wall without vertical reinforcement
Modified Wall behavior with vertical reinforcements, No Cracking
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In plane Behavior of Pier (Rocking)
Wall behaves as a discrete units during Earthquake
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In-plane behavior of Wall Pier ( Shearing)
If vertical reinforcement is absent
X-Cracking
Sliding above Sill Level 31
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Wall behavior modified( Seismic enhancement)
Rocking of pier Bending of pier in place of Rocking
Sliding of masonry No Sliding of masonry 32
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Box Action for Better performance
For Box Action Lintel band, Sill band, Foundation band Small openings in wall Good connection between wall and roof and wall and foundation
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strong mortar weak units
through masonry units
Associated NCMA TEK Note
low vertical compressive stress
sliding along bed joints
weak mortar strong units
stair step through bed and head joints
Possible Shear Cracking Modes
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Damage to In-Plane Wall
35 (Mahankaleshor Lower Secondary School, Saga)
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Severity of Crack
Guidance: After surveying the piece, estimate the percentage of openings that have cracking. If cracking is observed at openings, record the typical severity of cracking: - Severe ¼ inch cracks or greater - Moderate – around 1/8 inch cracks - Minor or Hairline cracks – around 1/16 inch cracks or cracks in
the finish only
Cracking at openings is generally less of a concern for Life Safety but can be uneconomical to repair.
Building Piece – Common Condition Checks
Photo credit: Arup
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Openings in Walls
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Out of plane failure Mode
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Off Plane Failure of Wall
Darbaar School, 2015 Nepal Earthquake
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Off Plane Failure of Wall
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Out of plane damage to Parapets
1994 Northridge Earthquake, Filmore
1996 Urbana Summer
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Gable Wall Damage
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BANDS AROUND OPENING
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Horizontal Bands
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Off Plane Behavior of Lintel Band
Detailing of Reinforcement in Lintel bands
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Openings
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Lintel and Sill Band
Band thickness= height of the brick including mortar, 2-12 mm dia L bar
If window breadth> 4’, Local band depth above opening = 2 Brick height
including mortar, 4-12 mm dia L bar 47
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Seismic Resisting Elements
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Opening
>4’
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TIE BEAM
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Vertical Reinforcement
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NBC RECOMENDATIONS
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Construction Materials
• Concrete :
M15 Grade( 1:2:4){ 15 Mpa Crushing Strength at 28 days for 150 mm Cube}
• Cement:
– Should be as fresh as possible
– If stored for 2 months, make lab test
– Do not use hardened cement
– Use OPC with NS Mark
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Construction Materials • Coarse Aggregate:
– Crushed or broken stone
– Should be hard, strong, dense, durable, clean
– Proper grading
– Free from any coating likely to prevent adhesion of mortar
– Avoid flaky, elongated pieces
• Size of Aggregate: – Concrete section thickness> 100 mm: use 20
down
– Thickness between 40 mm to 100 mm: Use 12 down
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Construction Materials: SAND
• Should be free from • organic matters, salts
• dust lumps, mica
• Soft or flaky particles
• Total undesirable substance< 5%
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Construction Materials: Brick Masonry
• Standard rectangular Brick(240 -10× 115 -5x 57+-3 mm ), burnt red
• 10 mm thick horizontal mortar bed
• Crushing Strength > 3.5 N/mm2
• Thickness of Non load bearing wall
– Minimum thickness of wall: Half Brick (1:4 Mortar)
– Maximum Thickness of Wall : one Brick ( 1: 6 Mortar)
• for Better workability: Use fresh lime ( 25%- 50% of Cement)
• For Plaster use 1:6 ratio, cube strength >3Mpa
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Reinforcing Bars
• MRT considers Fy =415 N/mm2 Bars for Beam and columns
• MRT prefers fy = 550 N/mm2 for slab only
• 7 dia Fe550 = 8 dia Fe 415
• 5 dia Fe 550 =6 dia Fe 250
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Categories of Buildings
Purpose: achieving seismic resistance at an economical
cost,
-three significant parameters : i) Seismic intensity zone where the building is located,
ii) Importance of the building, and iii) Stiffness of the foundation soil.
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Categories of Buildings Contd.. Seismic Zoning Map For MRT
Zone A : Risk of widespread collapse and heavy damage. Zone B : Risk of Moderate damage. Zone C : Risk of Minor damage.
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Categories of Buildings Contd.. Importance of the Building for MRT
Important Building :
• facilities essential before and after a disaster (eg., hospitals, fire and police stations, communication centres, etc.), or •house large numbers of people at one time (eg., cinema halls, schools, convention centres, etc.), or, •special national and international importance (eg., palaces, etc.), or •houses with hazardous facilities (eg., toxic or explosive facilities, etc.).
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•Ordinary Building : means any building which is not an important building (eg., residential, general commercial, ordinary offices, etc.).
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Categories of for SEISMIC STRENGTHENING PURPOSES
A
Category I Building shall be designed by Competent professional designer
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•Up to three-storeyed
- load-bearing brick masonry
- cement mortar construction.
•Up to two-storeyed
- Stone in cement mortar.
- Brick in mud mortar construction.
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Bearing Capacity: On the basis of judgment
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Limitation on Size Building Components
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Foundation In sloping ground
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Bearing Capacity: On the basis of judgment
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ONE STORY MASONRY
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Foundation: One Storied
Stone Masonry,
C/S Mortar
Brick Masonry,
C/S Mortar Brick Masonry,
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Walls Thickness
Brick Masonry,
C/S Mortar(1:6)
Stone Masonry,
C/S Mortar(1:6) Brick Masonry,
Mud Mortar 71
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TWO STOREYED BUILDING
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Foundation and Wall
Stone masonry in 1:6 C/S Brick masonry in Mud
Up to plinth level
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Walls Thickness
From Plinth to F.F.
From F.F. to top Floor
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THREE STOREYED BUILDING
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Foundation
Up to plinth level
Plinth to first floor level
First floor to top floor level
Masonry Building in C/S Mortar(1:6)
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Delamination of Wall
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Timber Band
Use of through stone in stone masonry wall
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Seismic Enhancement
Example of RC lintel Example of traditional building with timber tying elements
Arup
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CONFIGURATION
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Redundancy
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Redundant building> 2 Nos of wall in any direction
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Making Complex Span Simple
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Restriction on Plan Projection
K 1, K 2 < {0.25 A ,0.25 B} min
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Plan Aspect ratio
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CONFINED MASONRY
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Key Components of a Confined Masonry Building :
• Masonry walls made either of clay brick or concrete block units
• Tie-columns = vertical RC confining elements which resemble columns in reinforced concrete frame construction.
• Tie-beams = horizontal RC confining elements which resemble beams in reinforced concrete frame construction.
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Components of a Confined Masonry Building:
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Reinforced Concrete Frame Construction
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Confined Masonry Construction
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Confined Masonry versus Infilled RC frames:
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Confined Masonry
– Walls first
– Concrete later
Reinforced Concrete Infilled Frame
– Concrete first
– Walls later
Source: Tom Schacher
-construction sequence
- integrity between masonry and frame
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Confined Masonry vs RC Frames with Infills – Key Differences
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Location of Confining Elements is Very Important!
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Key Elements – Layout Rules
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Confined Masonry Panel Under Lateral Loading: Shear Failure
Displacement
She
ar
forc
e
1 2 3
12
3
P P PV
Vm
Vm
V 'm
Vc
Vc
VcV 'm
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Confined Masonry Construction: Toothing at the Wall-to-Tie-Column Interface
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Toothing enhances interaction between masonry walls and RC confining elements
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Session Objective
Participant will able to
– List School Building typology
– Understand typical damage pattern
– Understand theoretical background of damage
– Know Construction ideas to avoid damage
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THANK YOU
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