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4/16/2008
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NATHAN E. REYNOLDSNATHAN E. REYNOLDS ADVISOR: M. KEVIN PARFITT ADVISOR: M. KEVIN PARFITT STRUCTURAL OPTIONSTRUCTURAL OPTION THE PENNSYLVANIA STATE UNIVERSITY THE PENNSYLVANIA STATE UNIVERSITY APRIL 15, 2008 APRIL 15, 2008 ARCHITECTURAL ENGINEERING ARCHITECTURAL ENGINEERING
The Presentation
Building OverviewThesis ProposalStructural AnalysisStructural Analysis
The Floor SystemThe Lateral System
Architectural BreadthCM BreadthConclusions
The Building
Architecture1970’s Era Law School90,000 SF AdditionClassroom SpaceOffice Space
Construction4 PhasesMinimal Interruption2 Year Construction
The Building
StructureSteel Moment Frame Construction1 Bay ClearspanGeopier Foundation Stabilization
5 Stories
2 Stories
The Proposal
Structural StudyFloor System Analysis○ Composite Steel Joists (CJ-Series)Lateral System Analysisy y○ Braced Frame or Shear Wall Design
The Proposal
Breadth StudiesArchitecture○ Floor Plans○ Elevations
Construction Management○ Cost Estimate○ Project Schedule
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The Structure
Floor System ConsiderationsLarge Open SpansMaintain Existing Depth (31”)Strength DesignVibration CharacteristicsVibration Characteristics
The Structure
Strength AnalysisDesigned using SJI Standard SpecsSpacing: 5’ O.C.Non-Composite Dead Load: 270 PLFNon Composite Dead Load: 270 PLFLive Load: 600 PLFTotal Load: 1150 PLFPreliminary Design: 26CJ 1150/600/270
The Structure
Vibration AnalysisSpacing: 5’ O.C.Damping Coefficient: 0.03○ First Floor Classroomss oo C ass oo sNatural Frequency: 3.96 HzPeak Acceleration: 0.0041g < 0.005gFinal Design: 26CJ 1600/775/270○ (46) ¾” Shear Studs○ Larger than Required by Strength
The Structure
Existing Floor System Proposed Floor System
The Structure
Existing Floor System Proposed Floor System
The Structure
Lateral System ConsiderationsClassroom LayoutDrift RequirementsMember PropertiesMember Properties
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The StructureNorth-South Lateral System
Shear Wall○ Impractical Coordination of TradesDiagonal Bracing○ Span Length Issues (55 ft)Knee Bracing○ Excessive First Floor DriftChevron Bracing○ Architectural Interruption
Classroom CorridorEccentric Chevron Bracing○ Minimal Complications
The Structure
North-South Braced FrameEccentric Chevron Brace○ First Floor
HSS9x7x1/2”
○ Upper FloorsHSS8x6x1/2”
3 Braces RequiredIncreased Column Size○ W14x109Drift: 0.88 inches
The Structure
East-West Braced FrameDiagonal Bracing○ HSS8x6x1/2”Typical Column Sizeyp○ W14x82Drift: 0.43 inches
The Structure
Typical Bracing Connections
Typical Chevron Brace
Typical Diagonal Brace
The Structure
Additional Structural ConsiderationsFoundations○ Geopier Stabilization Remains Necessary○ Not Significantly ModifiedBeamsBeams○ W21x50
(44) ¾” Shear StudsColumns○ Sized for Gravity Load Only
W14x82○ Existing Design Sized for Drift
W14x159
The Architecture
Revised First Floor Plan
Revised Classroom Layout Service AreaService Area
Maintain Existing Corridor
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The Architecture
Revised Classroom Space
The Architecture
South Elevation
The Architecture
North Elevation
The Construction
4 Phase Construction○ Phase I (Structure/Sitework)
1 Year Duration
○ Minimize Impact on Classes○ Existing Overall Project Schedule
The Construction The ConstructionExisting System Proposed System
Total Cost: $1.44mTime: 21 WeeksBenefits:
Total Cost: $1.31mTime: 20 WeeksBenefits:
Less MembersNo Deck Fireproofing
TimeCost
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The Conclusions
Proposed Floor SystemNegligible Effect on Construction Process
Proposed Lateral SystemBeneficial to Overall Construction ProcessBeneficial to Overall Construction Process
Proposed Architectural Plan More Aesthetically Pleasing Façade
The Conclusions
RecommendationsImplement Revised Lateral System○ Structural Engineer Involved in Schematic
Design ProcessMaintain Existing Floor System○ Less Members, Equal CostUtilize Revised Architectural Elevations
