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WSP Parsons Brinckerhoff Optimizes Structural Design of London Financial District’s First Vertical Village

WSP Parsons Brinckerhoff Optimizes Structural Design of London Financial District’s First Vertical Village
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WSP Parsons Brinckerhoff Optimizes Structural Design of London Financial District’s First Vertical Village - 1

CASE STUDY Project Summary Organization: WSP Parsons Brinckerhoff Location: London, England, United Kingdom Project Objective: • Efficiently and sustainably deliver a 62-story, 278-meter glass-clad tower in the heart of London’s Financial District. • Implement an integrated modeling approach to utilize existing structural elements from a previous, partially constructed building. Products used: RAM ®, Integrated Structural Modeler, RAM Concept, RAM Structural System Fast Facts • 22 Bishopsgate is set to be London Financial District’s tallest building and the city’s first vertical village designed to promote the health and well being of its occupants. • WSP used RAM to design the structural system of the multi-use tower, incorporating existing structural elements from the previous Pinnacle building. • The final design was 15 percent lighter and 30 percent larger than the original Pinnacle design. ROI • Using RAM enabled WSP to use 100 percent of the existing foundation and salvage 50 percent of the basement for the new design. • Integrating RAM Structural System with Revit saved 40 percent in structural design time. • WSP saved significant costs on its fire protection assessment using Bentley technology to simulate fire effects on the steel beams. WSP Parsons Brinckerhoff Optimizes Structural Design of London Financial District’s First Vertical Village RAM Interoperability Cuts Project Delivery Costs and Reduces Modeling Time by Nearly 40 Percent Designing a New Superstructure to Fit an Unfinished Building Set to be the United Kingdom’s second tallest building next to the Shard skyscraper, 22 Bishopsgate is a 62-story, 278-meter glass-clad tower that will sit at the center of a cluster of high rises in London’s Financial District. PLP Architecture conceptually designed the building, featuring 120,000 square meters of office space, retail shops, fitness centers, educational facilities, restaurants, and an open viewing terrace and observatory, in a bid to create the city’s first vertical village. WSP Parsons Brinckerhoff (WSP) was retained to manage the structural modeling and design, as well as provide multi-disciplined engineering services to ensure sustainability, achieve a BREEAM excellent rating, and be the first in London to adopt the WELL Building Standard promoting the health and well-being of the building’s 12,000 occupants. The GBP 1.5 billion project required that 22 Bishopsgate be built on the site of a previous unfinished building, the Pinnacle, where the foundation, basement, and partially constructed core of this structure, called “the stump,” remained. The new tower needed to incorporate the former Pinnacle’s foundation and three stories of basement structures. In addition to the site constraints amid several high-rise buildings, a tight timeline, and budget requirements, “The challenge was to marry the superstructure, which did not correspond to where the foundations were,” explained WSP structural engineer Diego Padilla Philipps. RAM Structural System and RAM Concept provided WSP an integrated BIM solution to structurally design an efficient building that would be larger than and completely different from the Pinnacle design. Recycling the Foundation Working cooperatively with local structural specialists, WSP chose to demolish the seven-story Pinnacle stump and analyzed the interaction between the new design and the existing basement and foundation structural elements to determine what could be salvaged. Said Philipps, “We used RAM Concept to analyze the complicated geometry and export the spring reactions for the piles from the geotechnical analysis, and tried to make them compatible and interpret how the foundation was going to work.” Since the core footprint of 22 Bishopsgate is larger than the Pinnacle, the team determined that if they added new raft and pile caps to adapt the existing supports to transfer the structure’s weight, they could establish the additional foundation capacity for the bigger building, while still using 100 percent of the former Pinnacle’s foundation. Saving and reusing the existing foundation not only reduced costs but also minimized impact to the environment on this multi-use tower project. The interoperability of RAM enabled WSP to incorporate 100 percent of the foundation and 50 percent of the basement structural elements into the 22 Bishopsgate tower. Innovative Solutions Optimize Structural Load Transfers Because the footprints for the two buildings didn’t match, the team decided that the basement was the best place for the substructure load transfer structures. Using RAM Concept, WSP analyzed and modeled the three basement floors to determine how to build around and through them to optimize the transfers. On the north side of the structure, there were three big columns to support the 62 stories. WSP designed a raft to spread the loads for the three columns into the existing foundations. However, the loads were so gigantic that the new raft was failing. To appropriately dist

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WSP Parsons Brinckerhoff Optimizes Structural Design of London Financial District’s First Vertical Village - 2

"WSP is committed to using RAM software for steel design on every high-rise project we design. It is a prerequisite solution for our engineering designs." — Andrew Woodward, Director, WSP Parsons Brinckerhoff Find out about Bentley at: www.bentley.com Contact Bentley 1-800-BENTLEY (1-800-236-8539) Outside the US +1 610-458-5000 Global Office Listings www.bentley.com/contact Due to the waste management strategy implementation on the south side of the structure, the team could not use a vertical column going down to the foundation. Rather, WSP needed to incorporate an inclined column on this...

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