Structural Engineering Institute (SEI) Technical Session Presentations

Five Concurrent Technical Session Tracks will run from 8:30 am - 11:20am

Structural Engineering Institute (SEI) Technical Session Presentations

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First Technical Session
Topic: Bridge & Retaining Wall Impact Repairs - A TxDOT Perspective - 
Speakers: Justin Thomey & Chad Dabbs, TxDOT FTW

The State of Texas has a bridge inventory of over 53,000 structures and counting. The Fort Worth District has an inventory of over 4,300 structures, which amounts to roughly 8% of the State’s inventory. The amount of structures in the inventory creates a high probability of impact from travelling motorists. Commercial freight transport, permit loads, overweight/overweight loads and even passenger cars cause millions of dollars of damage annually by impacting bridge structures. The TxDOT Fort Worth Bridge Design Section, led by Manuel Padron, Jr., P.E., is constantly tasked with responding, evaluating and designing repairs to various bridge structure components damaged by impact. The focus of today’s presentation is to provide TxDOT Fort Worth’s Emergency Response Standard Operating Procedure and highlight different impact repair procedures based on type of impact and structural component. Real cases will be examined, methodology of repairs will be explained, and pertinent reference documents will be provide for participants to use as reference when tasked with bridge structure repairs. The primary focus of impact repair for this presentation will be steel and concrete beam repair, but other repairs such as retaining wall repairs will be highlighted. The ultimate goal of this presentation is to provide professional development by giving  an additional perspective to the participants, additional resources, repair techniques, and repair materials, etc. to bolster engineering acumen and provide the best possible service to clients and the general public. 

Justin Thomey is an EIT working for the TxDOT Fort Worth District Bridge Design Section. Justin graduated from the University of Texas at Arlington in 2011 and 2013 with a B.S. and M.S., respectively, in Civil Engineering with an emphasis in Geotechnical Engineering. Justin began working for TxDOT in May of 2013 and has designed various bridge and retaining wall structures, bridge repairs, routine maintenance plans, performed condition surveys, performed emergency inspections, and performed consultant management on various projects. Bridge designs include prestressed concrete girders, box beams, slab beams, widenings and phased construction. Retaining wall designs include MSE walls, drilled shaft walls, and soil nail walls. Bridge and retaining wall repairs include, steel beam replacement, heat straightening, concrete beam repair, MSE wall repair, soil nail wall repair. Justin is married to his wife, Bethany, and has two children, Kylie age 12 and Elijah age 3, with one more on the way this September. Justin will be sitting for the PE exam in October of this year.

Chad Dabbs is an EIT working for TXDOT in the Fort Worth District Bridge Design Section. Chad is the first in his family to attend college out of high school and earn a college degree. Chad graduated from Texas Tech University in December 2014 with a degree in Mechanical Engineering and started working for the Texas Railroad Commission as a state pipeline inspector. After one year as pipeline inspector Chad took a job opening with TXDOT and started working in March of 2016. Chad brings a different perspective of design to TXDOT’s team of bridge design engineers using knowledge from his Mechanical Engineering background. Chad is getting married this year in the month of October to his fiancé, Kali Koch, and eagerly awaits their honeymoon.

Second Technical Session
Innovative Solutions Using Ultra-High Performance Concrete (UHPC) -
Speaker: Gregory Nault, PE, SE, LafargeHolcim

Ultra-high performance concrete (UHPC) is one of the major breakthroughs in concrete technology in the last two centuries. It is a fiber-reinforced, cementitious material that offers exceptional mechanical and durability performance, including compressive strengths exceeding 22,000 psi and excellent resistance against environmental degradation. For these reasons, UHPC is being considered for a wide variety of structural and architectural applications to provide more sustainable, durable, long-lasting products in a multitude of markets. This presentation will introduce the audience to UHPC, provide a brief overview of its material properties, and discuss the advantages of using UHPC over conventional materials. It will present the various applications that have proven successful across several markets, including bridges, buildings, marines/ports, and energy facilities.

Greg is currently a project manager at LafargeHolcim, a world-leading concrete supplier that manufactures ultra-high performance concrete (UHPC) under the brand name Ductal®. Greg works closely with owners and engineers to provide innovative design solutions using UHPC. Prior to joining LafargeHolcim, Greg spent over 8 years as a professional structural engineer designing bridges for highway and rail projects. He received his BSCE from the University of Illinois at Urbana-Champaign and his MSCE from the University at Buffalo (UB). Greg is a registered professional engineer in five states and a registered structural engineer in Illinois. He is an active committee member of ACI and an Advisory Board member for the Institute of Bridge Engineering at UB.

Third Technical Session
Topic: Techniques, Materials, and Design Considerations for Strengthening and Repair of Existing Concrete Structures
Speaker: Nate Poen

Although the analysis and upgrade of concrete structures is somewhat of a "scientific art" that has been practiced for many years, it has evolved into a complex science that requires a blend of engineering, material scienceand construction perspectives. Strengthening projects may utilize traditional materials such as conventionalcement-based and steel materials as well as advanced composite materials (FRP’s) that are commonly used foraerospace applications. The many factors that create the need for strengthening include construction and design errors, increasein live load, new code requirements, low concrete strength, voids created during concrete placement, newpenetrations and prevention of progressive collapse from blastloads. This presentation will describe the solution strategies, different techniques, materials and design concepts used for upgrading concrete structures.

I am a 2010 graduate of Iowa State University with a B.S. in Civil Engineering. After graduation, I went to work with EFCO Corp. as a Territory Manager out of their Dallas office. My responsibilities were to aid clients in finding engineered concrete formwork solutions for projects in the heavy civil/bridge market. A couple projects I worked on prior to leaving was column and bent cap formwork design at the Beltline Rd/I-35E intersection and a multitude of flyover bridges at I-35W/I-820 interchange which are both still currently under construction. I am currently the Business Development Manager for Structural Technologies focusing on the Texas commercial market. My responsibilities are to aid clients in finding structural upgrade solutions in concrete structures. S.T. primarily works on strengthening existing structures on adaptive reuse or historical preservation projects or repairs design/construction defects on ground up jobsites.