Transcript of An overview of utilizing Revit in a collaborative approach to facilitate a major Expansion and...
- Slide 1
- An overview of utilizing Revit in a collaborative approach to
facilitate a major Expansion and Seismic Retrofit of a complex
existing Legacy Building from the 1986 Worlds Fair. Modeling new
life into a local landmark
- Slide 2
- Original podium base structure and 47 metre high geodesic dome
constructed in 1984-85 The dome shape, familiar at many World
Expositions, meant to symbolize our planet Originally designed as a
temporary structure to be the Preview Centre for the Expo 86 Worlds
Fair which commemorated Vancouvers 100 th Anniversary and
symbolized Vancouvers transportation and communications
history
- Slide 3
- During Expo 86 the facility was a theatre and a gallery for the
display of futuristic technology. Expo 86 was the largest
international event in Vancouvers history. When facility was
transformed into Science World in 1988 Bush, Bohlman & Partners
were the structural engineers for expansion and extensive
renovations
- Slide 4
- Since first expansion in 1988, BBP have worked on more than a
dozen renovation and exhibit projects including exhibit hall
mezzanines, rotunda infill and entry lobby infill Prepared
structural report for Facility Renewal Master Plan in 2009,
assessment for 2010 Olympics Russia Pavilion, engineering services
for Phase 1 of Facility Renewal Master Plan in 2011 and a condition
assessment study and report in 2014
- Slide 5
- Seismic assessment and retrofit of original Expo building
(podium structure) utilizing 3D dynamic analysis 2 storey plus
accessible roof terrace expansion on west side (facing False Creek)
to replace existing terraced faade, replace and rebuild existing
exit stairs on west side of facility Modify and rework existing
entrance on east side of facility (facing along Quebec Street)
- Slide 6
- Modifications to existing 1988 building expansion including
addition of new freight elevator (for moving exhibits between
levels to gallery space) and new steel feature stair through
existing Level 2 concrete slab/slab band structure plus various
interior renovations. Create a digital 3D model utilizing Revit
Structure in a collaborative environment, phased to incorporate the
as-built existing structure, proposed selected major demolition and
the new expansion, seismic upgrade and structural renovations.
Revit Structure model to be used primarily for effective integrated
design and coordination with the existing complex structure as well
as design visualization and construction.
- Slide 7
- Original 1984 Expo building and 1988 Science World Expansion
drawings are hand drafted with base building geometry established
on a circular gridline system Complex and congested existing pile
supported foundations with battered piles at major column support
locations Geodesic dome comprised of inner dome framed with
W-shaped steel members supporting triangular mirrored stainless
steel panels and outer exoskeleton of steel tube trusses.
- Slide 8
- Canon Design modeled grids, levels and generic floors/columns
and imported in structural Dome link modeled in Shanghai office by
creating curtain grid based on existing drawings and utilizing mass
and curtain system. This work turned over to BBP as LOD 200 model
BBP took ownership of imported generic data and accurately modeled
(to LOD 300) existing building structural components, incorporating
all major additions and renovations and linked dome model. Shell
model of core and architectural components created and linked into
structural model Architectural Cladding model linked to layout
changes and modifications to building envelope requiring structural
input no duplication of structural elements occurred.
- Slide 9
- Analytical model exported (with limited success - podium
structure, gridlines and levels. Dome modeled non-structural and
not exported) and imported in ETabs for analysis. Structural areas
to be demolished modeled and phased into Revit Structure model
Revit model facilitated installation of new pile foundations
relative to existing dome structure
- Slide 10
- Seismic Retrofit of the existing Expo building podium structure
was established utilizing large steel moment resisting frames
centered along existing radial gridlines on the west face. The
frames are anchored by custom cruciform shape wide flange columns,
a BBP trademark used extensively at YVR and at Lynden Pindling
Airport in Nassau Bahamas. A parametric Revit structural column
family was specially created to facilitate this specific purpose
The steel columns are supported by the new pilecaps keyed into the
existing concourse level such that no addition gravity or seismic
loads were transferred back to the existing structure.
- Slide 11
- West Expansion followed existing grid layout and framing,
infilling demolished terraced faade, incorporating the seismic
moment frames and replacing existing pre-cast stair cores
Architectural shell model linked to layout East renovations,
selective demolition, reworking of existing seismic elements and
interior renovations requiring structural input. Architectural
Cladding model linked to layout changes and modifications to
building envelope and existing structural elements incorporated
into new steel structure
- Slide 12
- Completed Expansion/Renovation model re-visited to facilitate
comprehensive Structural report for condition assessment of the
existing pile structure and support elements of the inner dome
steel frame support structure. Revit structure model upgraded to
take advantage of Revit Structure software product enhancements,
new features and advanced modeling tools Parameter added to
existing pile caps/pile schedule to include category for condition
assessment so that all piles could be visibly reviewed and itemized
by each steel piles condition status to be tracked and itemized in
updated pile schedule. Required extensive visual study of the
underside of the existing base structure from a small boat at low
tide. Study revealed the damaging effects of salt water on the
existing piles and categorized to create a condition assessment for
proposed remediation
- Slide 13
- The original dome linked model first created in 2010 needed to
be re-visited and re- modeled to provide a more accurate structural
representation of the inner dome steel frame and the outer dome
tubular frame, particularly at the connection nodes which were the
main focus of the dome condition assessment. Various options for
creating a realistic and useful structural model of the domes were
explored including Conceptual Mass Environment, Adaptive Components
as well as Dynamo, tools that were either not available or suitable
during the initial modeling phase.
- Slide 14
- Conceptual Massing Environment became the best solution given
the time restraints and scope of work required to facilitate
assessment report. A new linked dome model was created by stripping
down and removing the original curtain grid system and massing
model host from each dome pentagonal segment back down to its
beings as a planar surface and then geometry exported. The
structural CME modeling approach mimicked the drawing approach of
the original hand drafted documents, replicating the triangular
grid system and using the geometric information originally
calculated, compiled and documented.
- Slide 15
- The planar surface segment imported into CME and reference
points placed on the intersections of the planes to host nodes
needed to create the dome segment geometry. Reference lines then
created along the edges of the planar surfaces, snapping to the
hosted reference points creating the reference geometry need to
host the structural elements. Reference points hosted to midpoints
of the reference lines to host the structural members. Structural
members created using 2d model lines to create structural shapes
hosted to reference points then re-hosted to the reference points
on the reference lines between the reference nodes. Forms were then
extruded along the reference lines from the 3D structural shapes.
The accuracy of the reference line lengths, dihedral angles and
geometry matched the original drawings and calculated values within
a margin of error +/- 5mm
- Slide 16
- This was completed for each structural shape along the
appropriate reference line and plane, except along the leading edge
where each segment joins to the adjacent segment Process applied to
both dome inner and outer segments then imported into the Revit
model and polar arrayed as 5 segments to create the entire 360
degree dome. Once imported back into the upgraded model, existing
and addition model views provided the roadmap for visually
inspecting and documenting each structural member of the inner
support dome and assessing the condition of each of the node
connection point to the outer trussed dome frame. Completed
condition assessment information obtained from visual data and
onsite review entered back into to the upgraded Revit Structure
model to complete documentation required to augment the written
report
- Slide 17
- Revit Structure model and associated building information data
proved to be invaluable in facilitating the design and construction
of a very complex existing structure, providing an unprecedented
understanding of the entire facility and related structure. Access
to a completely digitized 3d model that accurately conveys the
as-built condition, including expansions, upgrades and current
conditions of the existing facility. The model can be utilized for
any future upgrades, additions or repurposing of the existing
facility should any new design opportunities be proposed or
presented. The updated dome structural model to be considered for
utilizing dynamo to populate structural framing elements as well as
testing for export to an analysis program.