Building Structures- Case Studies & Concepts

Full Session without Abstracts

342758 - Salesforce Tower: New Benchmarks in Seismic Performance

Friday, April 20
3:30 PM - 5:00 PM
Location: 203BC

The development and design of Salesforce Tower includes many “industry firsts,” establishing a new benchmark for the sustainable, tall buildings in regions of high seismicity. Included among these are:

• Anchor for High-Density, Sustainable, Transit-Oriented Office Space: When studies confirmed that job centralization in a sustainable, transit-oriented downtown core was critical to San Francisco’s continued economic success, a new Transit Center District Plan was developed to co-locate 11 Bay Area transit systems with increased height limits for related surrounding development. The pre-certified LEED Platinum Salesforce Tower was developed to mark the importance of the location and provide a new, vibrant image for San Francisco.

• Enhanced Seismic Safety and Performance: Given the importance of the tower and the number of building occupants, the seismic performance of the tower was enhanced through the implementation of more stringent design criteria targeting a 25% increase in seismic safety compared to other commercial buildings in San Francisco.

• The Deepest Foundations in San Francisco: The foundations for Salesforce Tower are embedded in the underlying bedrock formation more than 250 feet below existing grade. The design and construction of these elements set new standards in San Francisco for the support of tall towers.

• Advanced Structure-Soil-Structure Interaction Analysis: An unprecedented assessment of the seismic performance of the tower and its interaction with immediately surrounding buildings confirmed the seismic safety of the tower and the neighboring Transbay Transit Center. This extremely complex, and first-of-its-kind analysis considered multiple seismic ground motions and included Salesforce Tower, another immediately adjacent high-rise building, and the Transbay Transit Center.

This session will reveal the degree of coordination required among Owner/Developer, Structural Engineer, Geotechnical Engineer, and Seismologist to make possible the successful development, design, and construction of the tallest U.S. office building west of the Mississippi River.

Ron Klemencic

Chairman & CEO
Magnusson Klemencic Associates

Ron Klemencic, P.E., S.E., Hon. AIA is the Chairman and C.E.O. of Magnusson Klemencic Associates (MKA), a 185-person international structural and civil engineering firm headquartered in Seattle. The firm has completed projects in 47 states and 54 countries with an aggregate construction cost of $99 billion. Ron has been the structural engineer-in-charge for more than 175 buildings over 27-stories high in 19 countries. This represents over 190-million square feet of space and over $39-billion in construction cost. He was recognized with the 2016 Fazlur Khan Lifetime Achievement Medal awarded by the Council on Tall Buildings and Urban Habitat (CTBUH) for his engineering excellence of tall buildings and his leadership of the multi-discipline Council. In 2008, he was named Structural Engineer of the Year by Structural Design of Tall and Special Buildings Journal. His leadership in the collaborative design of tall buildings was recognized with the rare election of an engineer to Honorary Membership by the American Institute of Architects. He is also a Charles Pankow Foundation Board Member


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Mike Valley

Magnusson Klemencic Associates, Inc.

Over the last 29 years, Mike has managed many large, complex projects involving both new construction and renovation. He brings special expertise in seismic and foundation analysis and design, and he has been a key participant in the U.S. development of performance-based seismic design approaches. Mike frequently serves on committees and advisory panels charged with the development and authoring of national engineering codes and standards, including those for FEMA, NEHRP, and the Building Seismic Safety Council. His expertise and contributions have been recognized with an “Engineer of the Year” award from the Structural Engineers Association of Washington and a James M. Delahay Award from the National Council of Structural Engineers Association. Mike also leads MKA's Earthquake Technical Specialist Team and will bring an enhanced understanding of state-of-the-art approaches.


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Kirk Ellison

Senior Engineer

Kirk Ellison, PhD, PE is a Senior Engineer with Arup’s geotechnics group in San Francisco where he regularly performs seismic soil-structure interaction analysis for high profile projects such as the Transbay Transit Center in San Francisco and the new international airport in Mexico City. He is the geotechnical project manager for the approximately 1,000-foot-high Salesforce Tower and the ~600-foot-high Park Tower currently under construction in San Francisco. Kirk received his MS Degree from Northwestern University in 2008 and his PhD from Cambridge University in 2012.


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Robert Hazleton

The Herrick Corporation

Robert (Bob) Hazleton is President of The Herrick Corporation. Bob was a mechanic and welder prior to joining Herrick subsidiary PSP Industries in 1994. At PSP he focused on carbon and alloy plate fabrication for the power industry. He was transferred to Thai Herrick in 1997 where he focused on structural steel fabrication for petrochemical facilities within Asia, the Middle East and North Africa. In 2002 he was transferred to the parent company to focus on structural steel fabrication and erection for commercial and institutional projects, specializing in high-rise buildings designed to resist seismic forces. He has served as Estimator, Project Manager, Operations Manager, General Manager, Vice President and President.


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342758 - Salesforce Tower: New Benchmarks in Seismic Performance

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