using risafloor for g commercial building design
TRANSCRIPT
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Using RISAFloor for gCommercial Building Design
Deborah Brisbin, P.E.
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Commercial BuildingsToday’s Agenda
• Design Criteria to optimize your beam selection
g
• Design Criteria to optimize your beam selection
• Joist Design and Joist Girders
• Sloping Roofs
• Composite Design
• Vibration Analysis
• Using all of the RISAFloor features to build a C i l B ildiCommercial Building
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Design Criteria- Design Rulesg g
C t l b d i b dControl your member design based on:• Depth• Width • Maximum Code Check
Control the Deflection using DL, LL, or DL+LL Ratios or Maximums
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Joists : Loadingg
• Uniform Dead Load, UDL
• Uniform Live Load, ULL includes: LL, LLS, RLL, SL, SLN, RL
• Uniform Total Load UTL• Uniform Total Load, UTL= UDL + ULL
Important Notes: None of the Uniform loads include the
Other Load category
Load combinations are not used to create UDL, ULL or UTL
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Joists : Special Loading
Any Non-Uniform Loading= SPECIAL JOIST (SP)
The design is based on the capacity shear envelope of the joist under a standard uniform load. (Grey outline).
Calculations fromDesigning with Vulcraft: Steel JoistsDesigning with Vulcraft: Steel Joists,Girders and Steel Deck
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Joists : Special LoadinggSpecial Joist loading
L th 30 f tLength = 30 feet
Point loads at 1/3 points
Max Shear is not the Critical Point of design
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Joists Girders Girders are called out based on the assumed depth
28G refers to the DEPTH of the Joist Girder (28”)28G refers to the DEPTH of the Joist Girder (28 )
8N corresponds to the NUMBER of equally spaced concentrated loads
29.2K refers to the MAGNITUDE of the concentrated loads (23 kips + 6 kips = 29 kips)
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Joists Girders- Special
Non Uniform Point loads Special Joist GirdersNon-Uniform Point loads Special Joist Girders
Joist Girder Load Tolerance sets the maximum load variation to be allowed when specifying that standard joist girder call-out.
When the load variation exceeds this, the call-out will switch to “Special”
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Joists Girders- Moment of Inertia Given: Depth onlyEstimated Moment of Inertia:
I 027*2 *4*(b l th/12)*JG d thIzz = .027*2.*4*(beam length/12)*JG depth
Given: Depth number and magnitude of point loadsGiven: Depth, number and magnitude of point loadsEstimated Moment of Inertia:
Izz = .027*Joist spacing*Point load*(beam length/12)*JG depth
Reported in Detail Report
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Common QuestionsHow are my joists selected?
Wh t i th it i f J i t l ti ?What is the criteria for Joist selection?
1) Span
2) Capacity
3) Joist Weight
How did a 2.5K2 get selected?
Spans below 8’ are not available on the K JoistSpans below 8’ are not available on the K-Joist table.4’ – 8’: 2.5” K-Series Joists Substitutes used.
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Common QuestionsHow are my joists selected?
Actual UTL < Load Capacity (Black #)
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Common Joist QuestionsCan I analyze an existing joist?
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Sloping RoofsgSlope the roof in any direction,in multiple pitches or a single pitch.
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Sloping Roofsg
• Rise/Run
• Angle
• Max Height
Or Just Elevate the Points
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Composite Beam Design g
Control the Composite parameters in p pthe Global Parameters
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Composite Beam Design g• Uniform Studs (# Studs)
OR
• Segmented Studs(# Studs) shown at every Segment
OR
• Manually Change your Studs with the Redesign ToolRedesign Tool
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Vibration Based on the AISC Design Guide 11
Total Vibration Loads applied = ppSelf wt (members + deck) + Vibration Load (VL)
VL = Superimposed Dead Load + Live Load
Applied as a uniform distributed load (Section 3.3 of the AISC Design Guide)
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Vibration- Color Coded
Based on Acceleration Based on Frequency
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Let’s build a Commercial Building ModelCommercial Building Model
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Final Things to Consider About RISAFloor
• Import and Export GeometryRevit Structure
RISA has the most comprehensive link with Revit** New Webinar** May 27, 2010
Complete Integration between RISA and Autodesk Revit Structure
DXF
O M d l f b th G it d L t l D i• One Model for both Gravity and Lateral DesignYou can also design your foundation with RISAFoundation
** New Webinar** August 11, 2010
Comprehensive Design of Shallow Foundations with RISAFoundation
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Questions?
Please let us know if you have questions.
We will answer as many questions as time permits during th bithe webinar.
Once the webinar is closed, we will post all Q&A’s to our website: www.risatech.com
For further information, contact us at: [email protected]
THANK YOU!