Introduction

transcript

Introduction Project Information Depth: Blast Analysis ScenarioExisting Structure Blast Phenomenon LS-Dyna Analysis & Results Breadth: BIM Breadth: SHG Conclusion

UMMC Critical Care TowerBaltimore, MD

Nicholas LeonardStructural OptionThe Pennsylvania State UniversityBAE/MAE of Architectural EngineeringAdvisor: Kevin Parfitt

Predictions

Introduction Project Information Depth: Blast Analysis ScenarioExisting Structure Blast Phenomenon LS-Dyna Analysis & Results Breadth: BIM Breadth: SHG ConclusionPredictions

Leonard TaylorKevin ParfittEddie O’hareAnand Kumar SinghAbdul AzizRyan Solnosky

And a many thanks to

BALLINGER

for supplying a full set of drawings,and permission to use renderings.

Location: 22 South Greene Street, Baltimore, MD 21201

Function: Renovation including an additional five operating rooms and 60 patient rooms.

Total Floor Area: 140,000 sq. ft.

Height: 7 Stories + Penthouse (~116 ft.)

Anticipated Completion: 2013

Cost: $89,225,671 (structure only)

Contract Type: Guaranteed Max Price

Delivery Method: Design-Bid-Build

Architecture:

-Modular Units-Beige and Red Terra Cotta

-Cantilever Section-Additional Helipad

Why should we consider blast?

Terrorism

How do we design for blast?

TM 5-1300Structures to Resist the Effects

of Accidental Explosions

Alfred P. Murrah Federal Building

Foundations:

Gravity and Lateral Systems: The Cantilever System:Index

• Largest to likely occur• Similar charge weight as

Oklahoma City Bombing• Challenging design

22.5 ft

2 ftGround Surface

The Blast Curve & Dynamic Behavior:

Impulse load followed by a period of free vibration.

Structure dissipates energy through plastic yielding of reinforcement, and resists impulse from concrete’s mass.

Positive and negative phase.

Large Peak Overpressure.

Short Duration.

Explosion Types and Reflectance:Free-Air Bursts vs. Ground Surface Bursts

Material Properties:

Material Design Strength

Strength Increase Factor

Dynamic Increase Factor

Actual Strength

Concrete 6000 psi 1.26 1.19 8996 psi

Steel Reinforcem

60 ksi 1.1 1.1 72.6 ksi

Type of Program:Extreme event, non-linear dynamic, finite element analysis (LSTG).

LS-PrePost is user friendly interface

Compatibility:Had to reduce file size to compute.

Final file size ~ 550 MB, and required 60 GB of memory to perform analysis

High Performance Computing:Set up Hammer Account with Penn State

Completed one iteration in a 24 hr time span

Keyword Format

My Model:3” Meshing Cubes

Concrete Mesh (solid element)

Reinforcement (beam element)

Time Step Snapshots

Element Ductility Joint Rotation Response Limit

Column 103 4.02 deg 4.0 deg (N.G.)

1ft Strip of Slab

Not Valid Not Valid 6.0 deg (N.G.)

Hand Calculations:

Recommended Redesign:

Increasing Standoff Distance

Hardening of the Structure

Element Ductility Joint Rotation Response Limit

Column 13.8 2.72 deg 4.0 deg (Good)

1ft Strip of Slab

9.28 5.31 deg 6.0 deg (Good)

½” steel jacket surrounding all five column along column line B.

½” plate steel, increase thickness to 8”, and add additional #7 reinforcement for above slab.

Material Quantity Unit Price SubtotalConcrete 312 CY $124/CY $38688

Rebar 118 Tons $1050/Ton $123900Steel Plate 29265 sq ft $25.50/sq ft $746257

Total $908845

Major BIM Goals:

• Use FEM to more accurately design for blast.• Shift from using 2D paper based drawings onsite to

a 3D model on a tablet.• Better communication between the design team

and contractor.• Minimize the amount of change orders.• No items on punch list by project turnover.• More precise modeling of existing conditions.• Have the system perform during operations as

designed.• Increase efficiency of equipment maintenance.

Purpose for a BIM Execution Plan ultimately is to save money through efficiency during design and construction by better means of communication.

1. Defining goals and BIM Uses2. Organize processes3. Develop Information

Exchanges/Deliverables4. Set up infrastructure

STARTPROCESS

DEFINE WHAT CONSTITUTES AS A

DISASTER AND MAGNITUDE

DETERMINE WHAT AVAILABLE

RESOURCES ARE ACCESSIBLE AND

NEARBY

DEVELOP EVACUATION

PLANS FOR EACH LEVEL OF DISASTER

DEVELOP AN IMMEDIATE

ASSESSMENT AND REPAIR PLAN

MODEL THE DIFFERENT

SCENARIOS USING APPROPRIATE

SOFTWARE

DOES IT MEET REQUIREMENT

STARTPROCESS

Disaster Plann

in Level 2: Disaster Planning

• ASTM E1300 and F2248

Disaster Plann

Why consider glass in blast design?

Method: SHG Calculation & Comparison:Type U-Factor SHGC Shade IAC

1/4” annealed 0.58 0.69 0.85/8” fully

temp. w/ PVB Interlayer

2.3 0.8 0.92

Existing Redesign

Introduction Project Information Depth: Blast Analysis ScenarioExisting Structure Blast Phenomenon LS-Dyna Analysis & Results Breadth: BIM Breadth: SHG Conclusion

Introduction

Predictions

Thank you for listening!

I will now take any questions or comments.

Project InformationDepth: Blast AnalysisExisting StructureScenarioBlast PhenomenonLs-DynaPredictionsAnalysis and ResultsBreadth: BIMBreadth: Glass Redesign

AppendixIndex

Introduction

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