Masonry Design - efcms.engr.utk.edu
Transcript of Masonry Design - efcms.engr.utk.edu
Introduction 1
Masonry Design
Excalibur Hotel, Las Vegas28 story reinforced masonry bearing wall structure
Monadnock Building, Chicago (1891)16 story unreinforced brick bearing wall structure;
6 ft thick walls at base
Introduction 2
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Definitions
Slam ArchitectsPonce City Market, Atlanta
https://en.wikipedia.org/wiki/Wythe
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Introduction 3
_________ : beams over openings• Precast Concrete• Steel• Masonry
Masonry Elements
http://www.masonrybc.org/wall_details/structural-c-2-lintel.htm
http://www.jonesandsons.com/precast/lintels.html
Introduction 4
________________:Continuously reinforced horizontal element
Masonry Elements
http://www.masonrybc.org/wall_details/
https://theconstructor.org/construction/masonry/bond-beam-lintel-block/29496/
Introduction 5
___________: A vertical member, built integrally with awall, with a portion of its cross section typically projectingfrom one or both faces of the wall.
Masonry Elements
http://theconstructor.org/construction/masonry-pilaster-wall-design-details/14424/
http://www.axiomcpl.com/dwg/ma/MA06.1-square-masonry-pilaster-details.php
Introduction 6
_____________: multi-wythe wall in which the wythes are tied together so that the combined wythes act as a single unit
_____________: wall built of masonry arranged to have a continuous air space (with or without insulation) within the wall; wythes are tied together (multi-wythe non-composite wall)
_____________: wall having a facing of masonry units securely attached to backing (non-structural)
Composite wall
Cavity wall
Wall Types
Introduction 7
Reinforced Masonry Wall
http://www.masonrysystems.org/wall-systems/cavity-wall-concrete-block-veneer-reinforced-concrete-block/
Introduction 8
Cavity Wall
http://www.masonrysystems.org/wall-systems/cavity-wall-brick-veneer-reinforced-concrete-block/
Introduction 9
Cavity Wall: Cross-Section
Introduction 10
TMS 402 Code:
Less than ¼ unit overlap
Bond Patterns
Running Bond Stack Bond
1/3 Running Bond Flemish Bond
Introduction 11
Compression of mortar in tooling makes joints more weatherproof.
Mortar Joint Types
Interior/Exterior Mortar Joints
Exterior Mortar Joints
Concave V-Joint Weather
Raked Flush Struck
Squeezed Beaded Grapevine
Introduction 12
Unreinforced masonry: Tensile resistance of ____________ is included in design; resistance of any ________________ ______ present is neglected.
Reinforced masonry: Tensile resistance of _____________ is neglected in design (except for ______).
Design
_______________________ Design: Stress under service loads ≤ limiting stress divided by factor of safety. Stresses are within elastic range.
_____________ Design: Design strength (strength-reduction factor times nominal strength) ≥ Factored loads
Introduction 13
____ CodesBuilding Code Requirements for Masonry Structures
TMS 402-16(formerly TMS 402-13/ACI 530-13/ASCE 5-13)
Minimum Design Loads for Buildings and Other StructuresASCE 7-16
_____ CodesInternational Building Code - 2018
Chapter 7: Fire-resistanceChapter 14: Exterior wallsChapter 21: Masonry
International Residential Code - 2018
_____ CodesCode adopted by jurisdictional body
Building Codes
Introduction 14
TMS 402: Building Code Requirements for Masonry Structures (C pages)TMS 602: Specifications for Masonry Structures (S pages)
1988: First edition
1995: Seismic requirements moved from Appendix to main body of code; chapter on veneers added; chapter on glass block added
1998: Major reorganization of code; prestressed masonry chapter added
2002: Strength design chapter added; definitions of shear walls added to correspond to IBC definitions; code moved to a three year revision cycle
2005: Changed lap splice requirements, requiring much longer lap lengths
2008: Major reorganization of seismic requirements; added AAC masonry in Appendix
2011: Eliminated one-third stress increase and recalibrated allowable stresses; added infill provisions in Appendix
2013: Changes for partially grouted shear walls; updated unit strength table; limit states appendix
2016: Add shear friction provisions; increase cavity width; update anchor bolts
2022: Go to a six-year cycle
TMS 402/602 Code Overview
Introduction 15
TMS 402/602 Code
Introduction 16
ASCE 7-16 Load CombinationsStrength Design Allowable Stress Design
(1) 1.4D
(2) 1.2D + 1.6L +0.5(Lr or S or R)
(3) 1.2D +1.6(Lr or S or R) + (L or 0.5W)
(4) 1.2D + 1.0W + L + 0.5(Lr or S or R)
(5) 0.9D + 1.0W
(6) 1.2D + Ev + Eh + L + 0.2S
(7) 0.9D - Ev + Eh
Load factor on L in combinations (3), (4), and (5) is permitted to equal 0.5 for all occupancies in which Lo is less than or equal to 100 psf, with the exception of garages or areas occupied as places of public assembly.
(1) D
(2) D + L
(3) D + (Lr or S or R)
(4) D + 0.75L + 0.75(Lr or S or R)
(5) D + 0.6W
(6) D + 0.75L + 0.75(0.6W) + 0.75(Lr or S or R)
(7) 0.6D + 0.6W
(8) 1.0D + 0.7Ev + 0.7Eh
(9) 1.0D + 0.525Ev + 0.525Eh + 0.75L + 0.75S
(10) 0.6D - 0.7Ev + 0.7Eh
It shall be permitted to replace 0.6D with 0.9D in combination (10) for the design of Special Reinforced Masonry Shear Walls
Introduction 18
Organization Web Address CommentsBrick Industry Association www.bia.org Technical Notes on Brick
Construction
International Masonry Institute
ww.imiweb.org Masonry Bibliography, 1830-1990
Masonry Institute of America www.masonryinstitute.org Reinforced Masonry Engineering Handbook
National Concrete Masonry Association
www.ncma.org Manual of Facts on Concrete Masonry;
e-TEK notes
The Masonry Society www.masonrysociety.org Masonry Society Journal; Designer’s Guide; Database
Portland Cement Association www.portcement.org Concrete Masonry Handbook
Western States Clay Products Association
www.brick-wscpa.org Technical Publications on Veneer and Structural Brick
Masonry Organizations