final presentation reynolds n - pennsylvania state university€¦ · nathan e. reynoldsnathan e....

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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