Tag Archives: seismic design

DBA is growing again – welcome to Ali, Ben, and Mark!

Well, we are at it again.  The first 5 months of 2016 have seen us add three new faces of the new website creator.  So now, drum roll, please………

Ali Leib, E.I.

Ali 2016-1

Ali was a summer intern at DBA in 2014 and 2015 and joined us full time as a staff engineer in February.  She is a recent graduate of the University of Tennessee (Go Vols!) where she completed both her B.S. and M.S. in civil engineering. While completing her M.S., she was a teaching assistant in charge of grading lab reports for the structural and geotechnical undergraduate labs. She was also a research assistant under Dr. Dayakar Penumadu, resulting in her thesis: “Effect of Particle Morphology on the Deformation Behavior of Sand under Monotonic Loading Conditions.”  Unlike most of the rest of us, Ali insists that she will not be conforming to the (mostly) standard DBA hair style.  Ali will work in our Knoxville, Tennessee office.

Mark Madgett, P.E.

Mark Madgett_s

 

Mark received a BS and MS degree in Civil Engineering at the University of Tennessee, while working on research for TDOT to improve pavement design methods.  He has worked in both consulting and construction for the last 22 years, focusing primarily on deep foundations in the Southeastern US.  As a consultant, Mark gained extensive field experience with deep foundation construction techniques and the impacts on design.  In 2006, he began working for Seaboard Foundations, opening a green field office in Tri-Cities TN as the district manager.  In his role as design engineer for Seaboard Foundations, Mark has implemented design-build techniques in many markets (energy, institutional, commercial, transportation, and healthcare) that vastly improved the constructability and reduced the costs of deep foundation systems for his clients.  Mark will also work outr of our Knoxville, Tennessee office.

Ben Turner, Ph. D., P.E.

Ben recently completed his Ph.D. in geotechnical earthquake engineering at UCLA with an emphasis on the transfer of forces between the ground and foundation elements during seismic loading. Prior to starting at UCLA, he worked for two years for the Los Angeles office of Shannon & Wilson, Inc.  Ben worked in both construction and geotechnical firms while attending school for his B.S. and M.S. degrees. His experience includes: design, construction, and load testing of deep foundations;  geotechnical earthquake engineering including soil-structure interaction, seismic hazard analysis, site response, liquefaction triggering analysis and mitigation of liquefaction-induced ground failure; and, characterization of structural behavior of reinforced concrete foundations.  Here are two of the publications resulting from his dissertation work:

Turner, B., Brandenberg, S., and Stewart, J. (). “Case Study of Parallel Bridges Affected by Liquefaction and Lateral Spreading.” J. Geotech. Geoenviron. Eng. , 10.1061/(ASCE)GT.1943-5606.0001480 , 05016001.

Turner, B. and Brandenberg, S. (2015) “Pile Pinning and Interaction of Adjacent Foundations During Lateral Spreading”, DFI Journal, Volume 9, Issue 2.

Ben will anchor the West Coast Region of DBA, working from San Luis Obispo , California.

 

New PEER Report – Evaluation of Collapse and Non-Collapse of Parallel Bridges Affected by Liquefaction and Lateral Spreading

webPEER-2014-10-Brandenberg

Our own Ben Turner (future Dr. Turner!) was lead author on a report by the Pacific Earthquake Engineering Research Center (PEER) on liquefaction and lateral spreading effects on bridges. The report is titled “Evaluation of Collapse and Non-Collapse of Parallel Bridges Affected by Liquefaction and Lateral Spreading”. Ben’s coauthors are Dr. Scott J. Brandenberg and Dr. Jonathan P. Stewart of the Department of Civil and Environmental Engineering at UCLA. From the abstract:

The Pacific Earthquake Engineering Research Center and the California Department of Transportation have recently developed design guidelines for computing foundation demands during lateral spreading using equivalent static analysis (ESA) procedures. In this study, ESA procedures are applied to two parallel bridges that were damaged during the 2010 M 7.2 El Mayor-Cucapah earthquake in Baja California, Mexico. The bridges are both located approximately 15 km from the surface rupture of the fault on soft alluvial soil site conditions. Estimated median ground motions in the area in the absence of liquefaction triggering are peak ground  accelerations = 0.27g and peak ground velocity = 38 cm/sec (RotD50 components). The bridges are structurally similar and both are supported on deep foundations, yet they performed differently during the earthquake. A span of the pile-supported railroad bridge collapsed, whereas the drilled-shaft-supported highway bridge suffered only moderate damage and remained in service following the earthquake. The ESA procedures applied to the structures using a consistent and repeatable framework for developing input parameters captured both the collapse of the railroad bridge and the performance of the highway bridge. Discussion is provided on selection of the geotechnical and structural modeling parameters as well as combining inertial demands with kinematic demands from lateral spreading.

This report is part of Ben’s work on his doctoral dissertation. You can download the report by clicking on the linked citation below.

Turner, B., Brandenberg, S.J. and Stewart, J.P. (2014). “Evaluation of Collapse and Non-Collapse of Parallel Bridges Affected by Liquefaction and Lateral Spreading”, PEER Report 2014/10, Pacific Earthquake Engineering Research Center, University of California, Berkley, August, 2014, 94pp.

DBA Expands Again – Welcome Rob Saunders, P.E. and Ben Turner, P.E.!

DBA is please to announce the addition of two new members: Robert M. Saunders, P.E. and Benjamin Turner, P.E.

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Rob is a graduate of the University of Tennessee (BSCE and MSCE) with 11 years of experience. He began his career at S&ME working with our own Tim Siegel and for the last 8 years has been with GEOServices, LLC in Knoxville. He has a broad design background, specializing in analysis and design of earth retention systems and deep foundations. His experience with earth retention systems includes design and construction of soil nail walls, soldier pile walls, anchored systems, temporary shoring, and mechanically stabilized earth walls. His experience with deep foundation design includes lateral response analysis of deep foundations and design of deep foundation in karst geology. Rob has been involved with several major projects for private companies and public agencies including Foothills Parkway in Blount co., Tennessee, Interstate 240 expansion in Memphis, Tennessee, and Bridgeforth Stadium at James Madison University.

Rob will be located in Knoxville, Tennessee with Tim Siegel.

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Ben is currently pursuing a Ph.D. in geotechnical earthquake engineering at UCLA with an emphasis on the transfer of forces between the ground and foundation elements during seismic loading. Prior to starting at UCLA, he worked for two years for the Los Angeles office of Shannon & Wilson, Inc.  Ben worked in both construction and geotechnical firms while attending school for his B.S. and M.S. degrees.  His experience includes: design, construction, and load testing of deep foundations;  geotechnical earthquake engineering including soil-structure interaction, seismic hazard analysis, site response, liquefaction triggering analysis and mitigation of liquefaction-induced ground failure; and, characterization of structural behavior of reinforced concrete foundations.

Ben will be working part-time as he can while completing his Ph. D. and will  join DBA full time after completing his studies, staying in the Los Angeles, California area.

 

Welcome to both Rob and Ben!

Barry Meyer, P.E. joins DBA!

12_Barry MeyerWe are pleased to announce that Barry J. Meyer, P.E., has joined DBA. Barry is a recognized expert in the design and construction of deep foundations. His over 30 years of geotechnical engineering experience includes time at McClelland Engineers in Houston where he designed large diameter high capacity driven piles for major offshore structures and developed subsea geotechnical instrumentation. He applied that knowledge at Marathon Oil Company where he was part of the team that installed the Steelhead oil production platform in Cook Inlet, Alaska.

After his time in Texas, Barry spent time at both Leighton and Associates and at Law Engineering in California, before joining HDR in their Tampa, Florida office. During this time, his drilled shaft experience includes the H-3 Windward Viaduct on Oahu, Hawaii where drilled shafts were used for the first time to support a major bridge structure and are now the foundation of choice in Hawaii. He was also innovative in the use of the Osterberg O-Cell as part of the repair of the Los Angeles Coliseum after the devastating Northridge earthquake.

Barry has worked on numerous international projects in a variety of capacities including the Confederate Bridge connecting New Brunswick to Prince Edward Island over the ice filled Northumberland Straits; the 55 km elevated Bang Na Expressway Project in Bangkok, Thailand; and the Puente de la Unidad cable-stayed bridge over the Santa Catarina River, Monterey, Mexico. He also has considerable seismic engineering experience, and has designed and constructed flood protection levee systems and water storage reservoirs.

Barry will be based in the Tampa, Florida area. You can check out more details about him on the About Us page of our blog.  Welcome, Barry!

Two New Technical Manuals From DFI

The Deep Foundations Institute (DFI) has announced the publication of two new deep foundation reference manuals.   Excerpts from the announcement for both manuals are below.  Both manuals are available for order using this form or on-line at this link.

Guideline for Interpretation of Nondestructive Integrity Testing of Augered Cast-in-Place and Drilled Displacement Piles
DFI Augered Cast-In-Place Pile Committee (2011-2012) Chaired by Michael Moran
Tracy Brettmann, Principal Author; Bernard Hertlein, Matthew Meyer, Bria Whitmire, Co-Authors

(Image from DFI)

This guideline provides practical guidance for the interpretation of nondestructive testing (NDT) of the integrity of augered cast-in-place (ACIP) and drilled displacement (DD) piles.  …  This guideline supplements DFI’s two primary publications on ACIP piles: Augered Cast-in-Place Pile Manual (2003) and the Inspector’s Guide for Augered Cast-in-Place Piles (2010). This guideline was developed to provide 1) more detailed explanations of the various test methods available, 2) guidance on interpretation of the results, and 3) some typical examples of the data and interpretation.

Seismic and Lateral Load Design and Testing Guidelines
DFI Seismic and Lateral Loads Committee (2011-2012)
Chaired by Mark Petersen and Zia Zafir (2003-2009)
Robert Kruger, Guideline Editor

 

(DBA Photo)

This guidance document is intended to assist geotechnical engineers, pile designers, and contractors in analysis, design, and testing of piles and drilled shafts for lateral loads. … … This document discusses the background of different analytical and testing procedures and presents the recommended methods for analysis, design and testing of piles for lateral loads.

Tim Siegel, P.E. joins DBA!

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DBA is growing again with the addition of Tim Siegel, P.E. to our team! 

Tim has been primarily involved in the analysis and design of geotechnical structures including drilled shafts, cast-in-place piles, micropiles, and earth retention systems.  Tim is a Georgia Tech grad (like Dan!) and has worked most of his career since at S&ME and Berkel & Company Contractors, Inc. During his 12 years with S&ME, he advanced from Geotechnical Engineer to Technical Principal and Chief Engineer while developing expertise in construction in karst, seismic design, numerical modeling, and specialty foundations and retaining systems.  After leaving S&ME, he was a Senior Geotechnical Engineer with Berkel and was involved in large deep foundation projects all over the United States. While at Berkel, he led the development of the ground improvement technique using Berkel’s ground displacement technology. While at S&ME and then while at Berkel, he taught upper level and graduate level courses while on the faculty of the University of Tennessee.  Tim’s resume can be found in the About US section of our site.

We are really glad to have Tim joining us.  As you can see by his photo, he has the requisite hair style!