David Post v. Crane Rigging Corp. Preliminary Reconstruction Presentation Drake Exhibits 2-26-08 DRAFT

Accident site overview Revise roof lines on buildings per Morrell’s photos DRAFT Blevins Building Supply Co. - Site Plan

DRAFT Blevins Building Supply Co. - Site Plan US highway 21 new warehouse construction main office / store Revise roof lines on buildings per Morrell’s photos DRAFT Blevins Building Supply Co. - Site Plan

DRAFT Plan View - Blevins Building Supply Co. date of accident - 00-00-00 US highway 21 new warehouse construction main office / store DRAFT Plan View - Blevins Building Supply Co.

DRAFT New warehouse construction

DRAFT New warehouse construction roof trusses set exterior wall framing stack of roof trusses to be set DRAFT New warehouse construction

DRAFT New warehouse construction show crane Add crane to image and all others following Trusses are lifted by crane and set on top of exterior wall frame DRAFT New warehouse construction

Accident Sequence DRAFT

Add crane DRAFT Trusses are stacked in parking lot

DRAFT Trusses are rigged to crane using a spreader bar approx. 20’ long

DRAFT Spreader bar is attached to truss with chains at each end Check rigging detail with witnesses DRAFT Spreader bar is attached to truss with chains at each end

DRAFT Truss is lifted to vertical from stack

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DRAFT Truss bends and tilts when lifted off stack

DRAFT A tag line is used to control movement of the truss Add tag line and figure DRAFT A tag line is used to control movement of the truss

DRAFT Truss bends and flops around while being moved to building

DRAFT Truss is swung around to south end of building

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DRAFT Truss is moved to the north

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DRAFT Worker positions on scissor lifts Randall ________ David Post & Roger Billings Add workers on scissor lifts DRAFT Worker positions on scissor lifts

DRAFT Truss is lowered toward final position Randall ________ David Post & Roger Billings Add workers on scissor lifts DRAFT Truss is lowered toward final position

DRAFT Truss breaks at attachment point severely injuring David Post Roger Billings Add workers on scissor lifts DRAFT Truss breaks at attachment point severely injuring David Post

Accident is Result of Improper Rigging of Truss DRAFT

Rigging Trusses DRAFT

DRAFT Accident rigging dangerously inadequate for 80 foot long truss Chain angle more than 60º Spreader bar only attached at ends Spreader bar is too high on truss Spreader bar is too short 80 Feet DRAFT Accident rigging dangerously inadequate for 80 foot long truss

DRAFT Proper method for rigging an 80 Foot Long Truss Chain angle 60º or less Attachment points to truss at a maximum of 10 foot intervals Locate spreader bar at or above mid-height Spreader bar is 2/3 to 3/4 truss length 80 Feet DRAFT Proper method for rigging an 80 Foot Long Truss From BCSI-B1 Guide for Handling, Installing, Restraining & Bracing of Trusses

1. Calculation of Stress and Deformation of the Truss During Lifting Operations ANSYS Finite Element Analysis computer software used for all results Actual incident truss geometry and material properties incorporated in analysis Truss lifting points obtained from witness statements DRAFT

1. Calculation of Stress and Deformation of the Truss During Lifting Operations DRAFT

DRAFT 2. Animation of Truss Deformation During Lifting Operation This movie will play automatically - click to stop

3. Animation of Truss Deformation During Lifting Operation - close up of maximum stress location DRAFT Click this movie to play - click again to stop

4. Truss Deformation as it Leaves the Truss Stack DRAFT

DRAFT 5. Validation of the Computer Model of the Truss Measure actual load-displacement response of an exemplar truss at Tru-Line Truss Company Compare the measured values with that predicted by the computer model DRAFT

5. Validation of the Computer Model of the Truss DRAFT

Modeling Stresses in Wooden Trusses During Lifting and Moving DRAFT

Improper method of rigging Show top truss with color coded stress in resting position DRAFT Trusses are improperly rigged using a spreader bar approx. 20’ long

DRAFT Stress shown in truss structure as truss is lifted off pile Highest stress is at the point of attachment Colored stress model used through next 7 slides to show stresses during lifting and moving in both improperly rigged and properly rigged configurations DRAFT Stress shown in truss structure as truss is lifted off pile

DRAFT Truss bends and twists when lifted using inadequate rigging Show truss with color coded stress values DRAFT Truss bends and twists when lifted using inadequate rigging

DRAFT Truss breaks at point of attachment to spreader bar Show truss with color coded stress values DRAFT Truss breaks at point of attachment to spreader bar

Proper method of rigging Show truss with color coded stress values DRAFT Trusses are rigged to crane using a spreader bar approx. 60’ long

Stress shown in truss structure as truss is lifted off pile Show truss with color coded stress values Stress shown in truss structure as truss is lifted off pile

DRAFT Stress shown in truss structure as truss is moved to building Show truss with color coded stress values DRAFT Stress shown in truss structure as truss is moved to building

Show truss with color coded stress values DRAFT

Show truss with color coded stress values DRAFT Stress shown in truss structure as truss is set and fastened to top plate

DRAFT END Drake Exhibits - Demonstrative Evidence Services 1275 Main Street Brewster, MA 02631 508-255-8194 www.Drake-Exhibits.com DRAFT