CoreBrace Brochure Dec 2011
Transcript of CoreBrace Brochure Dec 2011
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Building codes recognize the improved seismicbehavior o Buckling Restrained Braced Frames(BRBFs), allowing UP TO A 25% DESIGN LOADREDUCTION, compared to other commonly usedlateral systems. Tis means:
FEWER rames
LESS structural weight
SMALLER oundations
CoreBrace BRBs are engineered to have essentiallythe same capacity in tension and compression,resulting in less overstrength built into the structure.Additionally, they can be used in single diagonalcongurations without design penalties. Tis means:
FEWER braces and connections
SMALLER rame columns and beams
SMALLER connections to the structure andoundations
CoreBrace Buckling Restrained Braces
COREBRACE BRBF TYPICAL CBF
CHEVRON CHEVRON
30'-0"
LVL 2
LVL 1
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W27x281ROOF
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HSS
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.438
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.625
GL G
30'-0"
LVL 2
LVL 1
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W14x283
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W16x77ROOF
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13.25in
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W14x68
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4.0in
9.5in
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GL GL
BRB
BRB
BRB
BRB
BRB
BRB
BRBF vs. Typical CBF Frame Comparison
University of Utah Marriott Library Renovation, Salt Lake City, UT
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BASESHEARCOEFFICIENT
BUILDING HEIGHT (FT)
LATERAL SYSTEM SEISMIC LOAD COMPARISON
Buckling Restrained Braced Frame (BRBF)
Special Concentrically Braced Frame (SCBF)
CALIFORNIA SITE
BRBF
SCBF
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DESIGN RESPONSE SPECTRUM4 STORY BUILDING CALIFORNIA SITE
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CoreBrace BRBs are manuactured in ourAISC CERTIFIED SHOP, located adjacent toour design oces in West Jordan, Utah. Tismeans:
Fabrication constantly monitored to meetthe HIGHEST QUALITY STANDARDS
Maximum SCHEDULE CONTROL
CoreBrace BRBs are designed to be extremelyQUICK AND EASYTO INSTALL. Our team works in close coordination with the steelabricator in the detailing phase o the project to minimize conicts inthe eld. Tis means:
FASTER ERECTION o buildings
NO ADDITIONAL LEAD TIME beyond that required
by the structural steel abricatorCoreBrace is committed to MEET OR EXCEED our clientsDELIVERY EXPECTATIONS each and every time
BRBs are a codied building lateral load resisting system. Tis means:
NO LICENSING FEES are required to use CoreBrace BRBs.
CoreBracessuperior seismic performance
means lower risk with cost savings
Community Financial Services Bank, Benton, KY
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CoreBrace Buckling Restrained Braces arestructural elements composed o a steel coreencased in a grout-lled steel tube. Te grout/casing assembly connes the core, increasingits critical load to a point that the axial capacityin compression is only limited by the yieldstress o the steel. Te concept allows the coreto resist the design axial orces utilizing the
FULL STEEL STRENGTH while the casingresists exural buckling. Proprietary InteraceMaterial is used to separate the two resistingsystems, with MINIMIZED FRICTION. Teresult is a high perormance brace that DOESNOT BUCKLE.
In this mechanism the steel core yields in tension andcompression, dissipating energy with a SUSTAINEDSYMMETRIC HYSTERETIC BEHAVIOUR. As a consequence,the braces act as structural uses, concentrating all the activityin the plastic range while gussets, beams and columns remainelastic during a seismic event. CoreBrace BRBs use a STABLEEND PROJECTION rom the casing, which eliminates the needor CJP welds. Tis provides improved redundancy in the loadpath and allows or post-event visual inspection.
Engineering Overview
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Brace Deformation (in)
ResultantForc
e(kips)
AISC Required Protocol
High Amplitude Protocol
BRB Hysteresis Curve (ASC=27 in2)
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Brace Deformation ()
SCBF Brace Buckling
BRB No BucklingResultantForce
(P)
BRBF
SCBF
BRBF vs. SCBF
CoreBrace BRB
COMPONENT DESCRIPTION
MATERIAL
SPECIFICATIONS
1 Core Plate Flat () or cruciormshape (+) ASTM A36
2 Steel Casing Square, rectangularor roundASTM A500 Gr BASTM A-53
3 Grout Casing infll Per CoreBracespecifcation
4 Connectionto GussetBolted (shown),welded or pinned
ASTM A572 Gr 50
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Additionally, to assist with the generation oproject documents, CoreBrace will provideCONNECTION DETAILS and REVIT FAMILIES.
Independent SUBASSEMBLAGE TEST results show that CoreBrace BRBs exceed the requirements o AISC 341,providing consistent hysteretic behavior during multiple load cycles, at deormations up to 22 times the yield elongation.
Testing oCoreBrace BoltedLug Braces was perormed at theUniversity o Utah, the Universityo Caliornia, San Diego and theNational Center or Research onEarthquake Engineering (NCREE)acilities in Taiwan.
CoreBrace has successully testeda brace spliced in the center andinstalled in two pieces, ideal orretroft applications.
Tested braces:Area: 4.0 in2 to 27.0 in2Length: up to 31-0
CoreBrace Spliced PlateBraces have been tested atthe University o Utah and theUniversity o Caliornia, San Diego.
Tested braces:Area: 1.5 in2 to 27.0 in2Length: 15-0 to 19-0
CoreBrace Pinned Braceshave been tested at the Universityo Caliornia, San Diego and theNational Center or research onEarthquake Engineering (NCREE)acilities in Taiwan.
Tested braces:Area: 4.0 in2 to 27.0 in2Length: 12-0 to 21-2
Testing oCoreBrace WeldedBraces has been perormed at theUniversity o Caliornia, San Diego.
Tested braces:Area: 2.0 in2 to 18.0 in2Length: 21-6
CoreBrace provides engineers with REAL TIME DESIGNASSISTANCE during all stages o the project. Our proessionalsreport brace stiness values to be used in the analysis o anystructure and design the gusset plates that connect the BRBs to therame columns and beams. Useul tools such as tables with reerence
values and MODELING GUIDES or structural analysis sofware(RAM STRUCTURALSYSTEM, RISA,
ETABS, SAP andPERFORM 3D) areavailable to helpengineers accuratelycapture the BRBsbehavior in theirstructural models withthe desired level orenement.
Force
(kips)
Displacement (in)
Perform 3D Trilinear
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CoreBrace Buckling Restrained Braces can meetthe most demanding project constraints includingextreme brace geometry layouts, architecturalaesthetic considerations, erection and constructionissues, and structural design requirements. Teollowing example options are available to buildbraces that will suit any specic need:
Square, rectangular, or round casing
Bolted, pinned, or welded connections
Shop applied fnishes
Te CoreBrace team is ready to assist in the constructionphase o the project when needed. We pride ourselves onproviding PROMPT RESPONSE to any job site inquiriesand RFIs and on making every eort to help contractorsmeet schedule.
Flexibility and Assistance
Pin Connection/Square Casing/Galvanized
Welded Connection/Square Casing/Full Height Gusset
Welded Connection/Square Casing/Shop Applied Epoxy Finish
Bolted Lug/Round Casing
Bolted Lug/Square CasingAES
Splice Plate Connection/Square Casing
SPLICE PLATE,(8) TOTAL
nB
olts
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SPLICE PLATE
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dp
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drg
Dwb Lwb
Dwc Lwc
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SLOT GUSSETTO RECEIVECORE PLATEEXTENSION
Dwsg
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WELDED
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LAPD HeadquartersLos Angeles, CA Bolted Lug Braces
MSB Career CenterWasilla, AK Bolted Lug Braces
The Questar Corporation New OceBuilding
Salt Lake City, UT Welded Braces
Center Court Building Retroft
Eugene, OR Welded Braces
Intermountain Medical CenterMurray, UT Bolted Lug Braces
The David and Lucile Packard FoundationLos Altos, CAWelded Brace as Fuse in Rocking Frame
BC Place StadiumVancouver, British Columbia, Canada
Bolted Lug Braces
Kaiser Vallejo Medical CenterVallejo, CA Spliced Plate Braces
UCSF Cardiovascular BuildingSan Francisco, CA Bolted Lug Braces
University o Utah Marriott LibraryRenovation
Salt Lake City, UT Bolted Lug Braces
World Market Center III
Las Vegas, NV Bolted Lug Braces
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COREBRACE, LLC
5789 West Wells Park Road West Jordan, UT 84081
Phone (801) 280-0701 Fax (801) 280-3231
www.corebrace.com
Contact us for cost estimatesand engineering support.