Dr. David Stevens has 20 years of experience in the design, testing and analysis of structures subjected to extreme dynamic loads. Over the past 10 years, he has performed numerical modeling studies of blast and impact-loaded armored vehicles and hardened structures, vehicle impact of countermobility barriers, and collisions between locomotives and nuclear waste containers. He has conducted explosive tests on building walls, windows, military shelters, protective barriers, blast walls, and armored and unarmored vehicles.
Previously a principal engineer at Applied Research Associates, Dave has conducted research and design for Southwest Research Institute and LTV Aerospace. He has taught undergraduate and graduate-level engineering courses, is a frequent presenter at industry conferences, and has written and edited numerous research reports and articles for peer-reviewed journals and proceedings publications. He holds or shares five U.S. patents.
Dave earned a Bachelor of Arts degree in Physics from Hope College, Bachelor of Science and Master of Science degrees in Civil Engineering from Clemson University, and a Doctorate in Civil Engineering from the University of Minnesota. He has served on committees of the American Concrete Institute, which honored him in 2008 with the rank of Fellow, and the American Society of Civil Engineers.
Dr. Eric Sammarco joined Protection Engineering Consultants (PEC) in the fall of 2013 and has fourteen (14) years of structural engineering research and design experience. He currently serves as the company’s Advanced Technology + Research (AT+R) Team Leader and manages/supports projects and applied R&D efforts focused on risk mitigation for people, systems and mission-critical infrastructure from natural hazards, extreme accident scenarios, and hostile attacks. Eric’s technical interests include explosives safety site planning and protective design, assessment and design for blast, shock, and impact effects, application of advanced multi-physics modeling and simulation techniques, and application of performance-based analysis and design methodologies for natural and man-made hazards.
Since joining PEC, Eric has worked in several different industry sectors. He has supported licensing-basis and post-Fukushima plant modification projects and security-related assessment/upgrade projects for domestic and international nuclear power plants. He has performed multi-hazard assessments, seismic peer reviews, and seismic risk rating system development for commercial, U.S. military and heavy industrial clients. Eric has been heavily engaged in transportation infrastructure safety and security; key efforts have included primary authorship of the Federal Highway Administration’s (FHWA) Bridge Security Design Manual, chief developer of the Anti-Terrorism Planner for Bridges (ATP-Bridge) software for the Department of Homeland Security (DHS), applied research and development of stay-cable protection strategies for long-span bridges, vulnerability assessment of a highway bridge to the effects of ongoing quarry blasting, and Principal Investigator of a Phase 2 SBIR with the Federal Railroad Administration (FRA) aimed at enhancing rail passenger survivability during a derailment event through resilient wayside structure designs. Eric excels at employing high-fidelity numerical modeling techniques to enhance the accuracy of assessments and optimize risk mitigation strategies; examples include quantifying load effects from landmine detonations, assessments of industrial machines and equipment to accidental explosions, beyond-design-basis seismic capacity assessments, novel tornado missile barrier designs for nuclear plants, and the implementation of a statistical glass-fracture material model into a nonlinear dynamic finite element framework for predicting the blast response of architecturally complex glazed façade systems.
Certifications and Licenses
- Registered Professional Engineer (PE) [Texas, Missouri]
Committees and Professional Affiliations
- Member of American Society of Civil Engineers (ASCE) and Structural Engineering Institute (SEI)
- Board Member of ASCE | SEI Austin, TX Branch
- Member of ASCE | SEI Blast, Shock, and Impact Committee
- Member of ASCE | SEI Bridge and Tunnel Security Committee
- Associate Member of ASCE | SEI Dynamic Analysis of Nuclear Structures (ASCE 4, ASCE 43)
- Past Associate Member of American Concrete Institute (ACI) Technical Committee 349 Concrete Nuclear Structures
- Past Associate Member of ACI Technical Committee 370 Blast and Impact Load Effects
- Ph.D. in Civil Engineering | University of Texas at Austin | 2014
- M.S. in Civil Engineering | University of Kansas | 2010
- B.S. in Civil Engineering | University of Kansas | 2006
- Sammarco, E. and Williamson, E. (2021). “Dynamic Response Characteristics that Lead to Direct Shear Failure of Blast-Loaded Columns.” ASCE Journal of Structural Engineering, 147(9); DOI 10.1061/(ASCE)ST.1943-541X.0003066.
- Hadjioannou, M., Sammarco, E., and Barsotti, M. (2019). “Drag Force Simulation on Blast Loaded Fabric Roof.” Proceedings from the 12th European LS-DYNA Conference; Koblenz, Germany.
- Brewer, T. and Sammarco, E. (2018). “Modeling Façade Performance Subject to Wind Loads in Urban Environments.” Proceedings from the 2018 Façade Tectonics World Congress; Los Angeles, CA.
- Jones, C., Sammarco, E., and McKay, A. (2018). “Consideration of Disproportionate Collapse Design Provisions in Earthquake Damaged Structures.” Proceedings from the Eleventh U.S. National Conference on Earthquake Engineering; Los Angeles, CA.
- Barsotti, M., O’Hare, E., Sammarco, E., Rasico, J. G., Gerst, D., and Newman, C. A. (2017). “Accurate Land Mine Modeling Using FEM & SPH with Modified Smoothing Length.” Proceedings from the 2017 NDIA Ground Vehicle Systems Engineering and Technical Symposium; Novi, Michigan.
- Hadjioannou, M., Barsotti, M., Sammarco, E., and Stevens, D. (2017). “Physical Testing and Modelling of Bolted and Welded Connections for Armored Vehicle Models.” Proceedings from the 2017 NDIA Ground Vehicle Systems Engineering and Technology Symposium; Novi, Michigan.
- Marchand, K. A., Davis, C. E., Sammarco, E. L., and Bui, J. (2017). “Extending Glass Façade Performance Predictions for Natural and Man-Made Hazards Using Accessible High-Fidelity Formulations.” Proceedings from the 39th IABSE Symposium; Vancouver, Canada.
- Marchand, K. and Sammarco, E. L. (2016). “When Structural Blast Design Doesn’t Really Include Blast Resistant Design: Damage Limiting Construction and Explosion Protection by Deflagration Venting.” STRUCTURE Magazine, American Society of Civil Engineers; Reston, VA.
- Barsotti, M., Sammarco, E., and Stevens, D. (2016). “Comparison of Strategies for Landmine Modeling in LS-DYNA with Sandy Soil Material Model Development.” Proceedings, 14th International LS-DYNA Users Conference; Detroit, MI.
- Sammarco, E., McKay, A., and Marchand, K. (2016). “Enhancing the Security of U.S. Highway Bridges: Making Use of New Technology to Assess Risk and Prioritize Protective Measures.” The Structural Engineer, Journal of the Structural Engineers Association of Texas; Austin, TX.
- Marchand, K., Davis, C., Sammarco, E., Bui, J., and Casper, J. (2016). “Coupled Glass and Structure Response of Conventional Curtain Walls Subjected to Blast Loads: Validation Tests and Analysis.” Journal of Glass Structures & Engineering.
- Sammarco, E. L., LaRue, T., Smit, J., and W. Guess. (2015). “Computational Evaluation and Mitigation of Wind-Driven Missile Impact against Condensate Storage Tanks and Associated Piping Connections.” Proceedings, 23rd Structural Mechanics in Reactor Technology (SMiRT23); Manchester, UK.
- Sammarco, E L. (2014). “Development of Simplified Dynamic Response Models for Blast-Loaded Bridge Components.” Doctoral Dissertation, The University of Texas at Austin; Austin, TX.
- Sammarco, E. L., Jones, C. A., Williamson, E. B., and H. O. Sprague. (2014). “Design for Blast and Seismic: Acknowledging Differences and Leveraging Synergies.” STRUCTURE Magazine, American Society of Civil Engineers; Reston, VA.
- Harris, K. D., Robinson, N., and L. Sammarco. (2013). “Seismic Time Histories: A Practical Approach.” STRUCTURE Magazine, American Society of Civil Engineers; Reston, VA.
- Puryear, J., Barsotti, M., Stevens, D., Williamson, E. B., Sammarco, E. L., Bui, J. Q., and Crane, C. K. (2013). “Modeling Blast-Loaded Steel Cables.” Symposium on Interaction of the Effects of Munitions with Structures; Potsdam, Germany.
- Puryear, J., Stevens, D., Marchand, K., Williamson, E. B., Sammarco, E. L., Bui, J. Q., and Crane, C. K. (2013). “Predicting Spall and Breach for Blast-Loaded Reinforced Concrete Columns.” Symposium on Interaction of the Effects of Munitions with Structures; Potsdam, Germany.
- Sammarco, E. L., Bui, J. Q., Williamson, E. B., Puryear, J., Stevens, D., and Crane, C. K., (2013). “From Research to Practice: A Novel Vulnerability Assessment Software for Blast-Loaded Bridge Components.” Symposium on Interaction of the Effects of Munitions with Structures; Potsdam, Germany.
- Sammarco, E. L., Bui, J. Q., Hendryx, R., Williamson, E. B., Puryear, J. M. H., Stevens, D. J., and Crane, C. K. (2013). “Enhancing the Security of Critical Highway Infrastructure: Development of Component-Level Vulnerability Assessment Software for Blast-Loaded Bridges.” The 2013 Critical Infrastructure Symposium; West Point, NY.
- Biography article in Civil + Structural Engineer Magazine, January 2013. <http://csengineermag.com/article/youre-looking-at-the-future/>
- Sammarco, E. L., Hendryx, R., Bui, J. Q., Williamson, E. B., Crane, C. K., and Ray, J. C. (2012). “Development of a Novel Engineering Tool for Assessing Vulnerability of Critical Highway Bridge Components Subjected to Blast.” Proceedings, 4th Munich Bridge Assessment Conference; Munich, Germany.
- Sammarco, E. L., Williamson, E. B., and Davis, C. (2011). “Enhancing the Security of U.S. Highway Bridges: Developing Protective Design Guidance, Tools, and Techniques.” Transportation Research News Magazine, Transportation Research Board; Washington, D.C.
- Williamson, E. B., Sammarco, E. L., Hendryx, R., and Bui, J. (2011). “Addressing the Vulnerability of U.S. Highway Bridges to Terrorist Attacks: A Structural Engineering Perspective.” Proceedings, 5th Annual Department of Homeland Security University Network Summit, U.S. Department of Homeland Security; Washington, D.C.
- Sammarco, E. L., and A. B. Matamoros. (2010). “Plasticity-Based Nonlinear Finite Element Analysis of Reinforced Concrete Columns with Inadequate Seismic Detailing.” Proceedings, US-Canada Joint Conference on Earthquake Engineering, EERI; Toronto, Canada.
Mr. McKay has 17 years of experience as a Structural Engineer with focus in the security and protection engineering field. Early in his career, Mr. McKay developed algorithms for the calculation of blast pressures to support vulnerability assessments of mission critical government buildings. He also used weapon effects software to develop structural components selection charts for the effect of indirect fire weapons. Mr. McKay joined Protection Engineering Consultants in January of 2007. At PEC, he regularly manages physical security and blast-resistant design (Design-build, Design-bid-build) efforts for numerous buildings for conformance with the DoD requirements in UFC 4-010-01, ISC Physical Security Criteria for Federal Facilities, and Physical Security Design Manual for VA Facilities. In addition, Mr. McKay has also managed and led large test and research efforts for the Department of State (DoS) in the field of blast-resistant design and response of structures. Mr. McKay also has extensive experience performing progressive collapse analysis and design of buildings using both GSA and DoD standards, including assessments and retrofit designs for existing structures. While at PEC, Mr. McKay was a lead researcher in the development of dynamic and static increase factors for static analysis methods in the effort led by PEC to update the UFC 4-023-03 “Design of Buildings to Resist Progressive Collapse”. Other capabilities and experience include:
- Containment Structures Design for Internal Blast and Fragmentations
- Blast and Shock Evaluation of equipment
- OBO Embassy Standards
- Complete frame response of steel buildings subjected to blast loads
- Counter-mobility barriers
- Blast Testing (Arena and Shock Tube) test plan development, instrumentation planning, post-test inspection, and evaluation of structures, data processing, and post-test analysis.
Certifications and Licenses
- Registered Professional Engineer (PE): Alabama, Florida, Georgia, Kentucky, Maryland, Massachusetts, Minnesota, New Jersey, South Carolina, and Texas.
- NCEES Record Holder
- PMI – Project Management Professional (PMP)
Committees and Professional Affiliations
- Member of American Society of Civil Engineers (ASCE) – ASCE/SEI 59 Blast Protection of Buildings
- Member of ASTM International F12 (Security Systems)
- Member of the Project Management Institute
- Structural Engineers Association of Texas (SEAoT) San Antonio Chapter – Secretary
- M.S. in Civil Engineering | University of Texas at San Antonio | 2008
- B.S. in Engineering | John Brown University | 2002
- McKay, A., Jones, C., & Benshoof, P. (2016). Investigation of Conventionally Designed Steel Frame Structures’ Inherent Resistance to Lateral Blast Loading, Test 1 Results. Military Aspects of Blast and Shocks (MABS) Conference.
- Davis, C., Conrath, E., Tomanek, M., & McKay, A. (2015). Are Mullion Response Limits too Conservative? ASCE SEI Structures Congress Proceedings.
- Conrath, E., Davis, C., Jones, C., McKay, A. (2015). Multi-Hazard Design of Facades: Important Considerations of Wind and Seismic Interaction with Blast Requirements. ASCE/SEI Structure Congress Proceedings.
- Williamson, E.B., Bayrakk, O., Williams, G.D., Davis,C.E., Marchand, K.A., McKay, A.E., Kulicki, J., and Wassef, W. (2010). NCHRP Report 465: Blast-Resistant Highway Bridges: Design and Detailing Guidelines. Transportation Research Board, Washington D.C.
- Marchand, K., McKay, A., and Stevens, D. (January, 2008). Dynamic Increase Factors (DIF) and Load Increase Factors (LIF) for Alternate Path Procedures