Episode 115 - The Gap That Saves Buildings
The Structural Engineering Podcast
Release Date: 06/03/2026
The Structural Engineering Podcast
In this episode, we explore the unique challenges of structural engineering in existing buildings, where the drawings don’t always match what’s actually in the field. We discuss how engineers navigate unknown conditions, undocumented modifications, aging materials, and the constraints that can make seemingly simple projects incredibly complex. We also dive into creative problem solving how to avoid getting stuck on the first workable solution, think beyond conventional approaches, and find better ways to work within an existing structure. From deformation compatibility and load...
info_outlineThe Structural Engineering Podcast
In this episode, we take a closer look at the concrete mixture requirements structural engineers encounter in ACI 318. We explore where the familiar values for water-to-cementitious-material ratio, air content, aggregate size, cement type, and durability requirements come from—and what they mean for the concrete we specify on our projects. We discuss how ACI durability exposure classes influence mixture requirements, including maximum water-to-cementitious-material ratios, minimum specified strength, air entrainment, and other material requirements. Guest Profile: Tyler Ley is a...
info_outlineThe Structural Engineering Podcast
In this episode, we explore what’s next for the American Institute of Steel Construction (AISC) and the future of structural steel. We discuss how AISC’s role extends beyond the Steel Manual, how research makes its way into the codes and standards engineers use every day, and the trends shaping the steel industry over the next decade. We also dive into AISC’s 2033 Initiative and what it could mean for engineers, fabricators, and the broader steel industry. Finally, we look at the next generation of structural engineers where new graduates are excelling, where they need more...
info_outlineThe Structural Engineering Podcast
In Episode 122, we explore a question that goes beyond how we design buildings: how do we make our communities more resilient before disaster strikes? We discuss the growing challenges of natural disasters, infrastructure risk, insurance, and the economic consequences of rebuilding after the fact — and why simply designing for the minimum code requirements may not be enough. We also dive into what it means to “future proof” America, and how engineers can play a role in connecting technical solutions with government, finance, insurance, technology, and community investment. From disaster...
info_outlineThe Structural Engineering Podcast
In this episode, we explore the future of structural engineering and what it will take to continue pushing the profession forward. We discuss why innovation can be difficult in a risk-averse industry, how performance-based design is changing the way engineers approach complex structures, and whether our reliance on codes and software is beginning to replace first-principles thinking. We also dive into the growing role of AI in structural engineering—where it could accelerate design and innovation, where it could create new risks, and what should always remain the responsibility of the...
info_outlineThe Structural Engineering Podcast
In this episode, we sit down with Joshua Schultz, Ph.D., P.E., to explore the engineering behind grid shells and structural glass. We discuss how grid shells achieve remarkable long spans through efficient geometry, the role of form-finding and computational design, and the challenges of analysis, connections, and construction. We also dive into structural glass, covering its behavior as a structural material, connection design, redundancy, code development, and the projects pushing the boundaries of transparent architecture. Guest Profile: Joshua Schultz, Ph.D., P.E., LEED AP, is a structural...
info_outlineThe Structural Engineering Podcast
In Episode 119, we sit down with Travis Slisher to discuss what great leadership looks like in the engineering profession and why technical expertise alone isn't enough to build successful teams. Drawing from his own leadership journey, Travis shares the lessons he's learned about earning trust, communicating effectively, developing future leaders, and creating a culture where engineers feel empowered to grow and contribute. We explore the differences between managing projects and leading people, the common leadership mistakes engineers make as they advance in their careers, and how strong...
info_outlineThe Structural Engineering Podcast
In this episode, we sit down with Claire Gandee from Bekaert to explore how steel fiber reinforced concrete is changing the way engineers design slab-on-grade and industrial floor systems. Using two comparable projects, one with conventional reinforcement and one with steel fibers, we discuss how the design process changes, what the fibers are actually doing after concrete cracks, and when steel fibers can replace traditional reinforcing steel. Claire explains how fibers influence crack control, joint spacing, durability, constructability, and long-term performance, while also addressing...
info_outlineThe Structural Engineering Podcast
In this episode, we sit down with forensic structural engineer Mark Duckett, PE, SI, from Robson Forensic to explore what happens when engineering decisions are examined long after a project is complete. We discuss the role of expert witnesses, what the legal system means by "standard of care," and how forensic engineers use the scientific method to investigate failures, defects, and construction disputes. Mark explains the difference between simply disagreeing with a design approach and identifying a true breach of professional responsibility, while sharing insights into how root causes are...
info_outlineThe Structural Engineering Podcast
In Episode 116, we explore the world of nonlinear structural analysis and performance-based seismic design. We discuss when nonlinear methods become necessary, how pushover analysis helps engineers understand building behavior beyond elastic limits, and where these advanced tools fit within modern codes and standards. The conversation covers modeling challenges, common misconceptions, software workflows, seismic performance objectives, and real-world applications where nonlinear analysis can fundamentally change design decisions. We also look ahead to how increased computing power, AI, and...
info_outlineIn this episode, we dive into facade engineering and explore how building skins are designed to accommodate wind, seismic drift, thermal movement, construction tolerances, and long-term building behavior. We discuss the different types of facade systems, the loads they are designed for, and why movement joints are one of the most critical and often misunderstood parts of facade design.
The conversation covers slip joints, story drift, facade deflection criteria, joint sizing, masonry veneer challenges, and the coordination required between structural engineers, facade engineers, architects, and contractors. We also discuss common detailing mistakes, constructability concerns, and practical lessons engineers can apply to improve facade performance and reduce costly field issues.
Schematic Detail provided by BHB

If you would like the presentation slides or access to the presentation recording by Jeff, reach out to him at Jeff.Thomas@bhbengineers.com.
Jeff also suggest for additional expertise on this topic, connect with Kirsten Zeydel with Nevell Group. She gives an excellent presentation about all these tricky slip conditions.
LinkedIn: https://www.linkedin.com/in/kirsten-zeydel-48212495/
Email: kzeydel@nevellgroup.com
Additional Resources:
https://nvlpubs.nist.gov/nistpubs/gcr/2016/NIST.GCR.16-917-38.pdf?utm_source=chatgpt.com
https://www.structuremag.org/article/challenges-in-cladding-design/
https://www.bhbengineers.com/articles/a-new-approach-exterior-metal-stud-design
Guest Profile:
Jeff Thomas, PE, is a Senior Associate at BHB Structural Engineers with extensive experience in building design, seismic engineering, and project leadership. A graduate of the University of Utah, Jeff has spent his career helping deliver a wide range of structural projects throughout the western United States while mentoring the next generation of engineers.
This episode is brought to you by CalcBook, the go-to calculation platform built specifically for structural engineers. Whether you're designing steel connections, concrete members, or timber framing, CalcBook helps you create transparent, organized, and code-referenced calculations in a fraction of the time.
Spend less time formatting spreadsheets and more time engineering. Check them out at CalcBook.com.
StructurEd (our free study tool): TheEngineeringPodcast.com/StructurEd
Reach out to us:
Disclaimer: Here