Design for Lateral Loads/Systems

Full Session without Abstracts

340861 - Guidelines for Engineering Judgment in Tornado Shelter Design

Friday, April 20
3:30 PM - 5:00 PM
Location: Ballroom A

For this Session, we are requesting 90 minutes with round tables that can accommodate 8 to 10 people at each table. If there is a choice between larger or smaller rooms that have round tables, we’re requesting the larger room.

The National Storm Shelter Association (NSSA) developed the original document which became the ICC 500 standard, “ICC/NSSA Standard for the Design and Construction of Storm Shelters”. The NSSA Design Practices Committee, in conjunction with the Structural Engineers Association of Texas (SEAoT) Tornado Shelter Design Practices Task Group, has been drafting guidelines for Structural Engineers on how to apply engineering judgment to community tornado shelters when faced with many ICC 500 Code provisions which do not establish clear expectations (even with the ICC 500 Commentary).

Based on Huckabee’s Learning Exchange (LEx) Lab research in Waco, Texas on optimizing student engagement, in collaboration with Baylor University and Texas Education Service Center 12, this Session will incorporate “Challenge Based Learning”. This Session will be Facilitated by the Speakers, each having different expertise but a necessary perspective on the Structural Engineering challenges requiring engineering judgment in Tornado Shelter design using the new ICC 500 requirements: Structural Engineer of Record, Structural Peer Reviewer, Impact Resistant Device Manufacturer and Structural Observer. Each Table will represent a Structural Engineering Design Firm that has to develop its interpretation of the ICC 500 code requirements and apply the code to respond to a specific challenge. Each challenge will be based on a real project experience from the Facilitators. Each challenge will begin with a brief subject matter orientation by one of the Facilitators followed by a short introduction to the details of the challenge by a different Facilitator and the presentation of the central question for that challenge. After the Facilitators determine that the Teams have had sufficient time to respond to a challenge, the Facilitator presenting the subject matter will present his recommendation and ask Tables that are more conservative or less conservative to identify themselves with a color-coded table marker, followed by a brief discussion summary from one table that is more conservative and one table that is less conservative, before proceeding to the next challenge.

Attendees will obtain:

1. A more profound understanding of the challenges associated with these code provisions.
2. A greater appreciation of the practices recommended by NSSA and SEAoT Facilitators that have faced these challenges on real projects.
3. Immediate feedback on how conservative/unconservative their own interpretations are relative the remainder of the room.
4. Influence with the NSSA and SEAoT Facilitators who will take the interpretations from attendees back to their groups that are drafting industry guidelines which will in turn eventually impact industry expectations on the attendees themselves.
5. “Utilized Networking” between previously unacquainted Engineers (often with different geographic location, experience level and background) leading to more effective and lasting working relationships than “Cold Networking”.

Challenges may relate to the following subjects:

+ Defining a method of modeling “lay down, rollover and collapse hazards” of adjacent structures
+ Defining maximum allowable lateral deflections of foundations under 250 mph wind speeds
+ Defining an upper-bound debris impact load for analytical justification of a field deviation from impact-tested configurations
+ Predicting interior pressure changes in occupied spaces near natural ventilation openings
+ Defining the minimum tributary area for component specification pressure rating
+ Defining Structural Engineering responsibilities for Storm Doors, Shutters and Louvers
+ Obtaining and reviewing calculations when performing a Peer Review
+ Defining a Statement of Special Inspection and Structural Observation
+ Designing breakaway connections strong enough for 120 mph to reliably break at 250 mph winds

William A. Wallace

Associate/Senior Structural Engineer

William Wallace has more than 38 years of structural engineering experience. He has a BSCE ’78 and MSCE ’82 from the University of Texas at Arlington. His 38 years of experience include ten plus years as an adjunct with UTA for advanced concrete and structural steel design. He is also a voting member of ACI 350, Environmental Concrete Structures. He has been involved in the design of many highly complex structures for both the military and civil works construction programs of the Corps of Engineers, buildings and structures associated with the General Services Administration, and building and other structures for private industry clients including medical office buildings, hotels, schools, colleges, and transportation entities. William is a member of ASCE, SEI, ICC, ACI, and AISC.


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Benchmark Harris

Vice President of Engineering

Ben is the Vice President of Engineering with Huckabee, a 200 person Architecture and Structural Engineering firm that designs Learning Environments. He has 20 years of experience as a Structural Engineer with a BS in Civil Engineering from the University of Texas at Austin and a MS in Civil Engineering - Structures and Applied Mechanics from the University of Texas at Arlington. He is the Chair of the National Storm Shelter Association (NSSA) Design Practices Committee, the Chair of the Structural Engineers Association of Texas (SEAoT) Tornado Shelter Design Practices Task group, and the Chair of the national Disaster Investigation Program for The Masonry Society (TMS) visiting disasters such as the Moore, Oklahoma Tornadoes in 2013 and Hurricane Katrina in 2005.


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Nelson Kraschel

Product Manager

Nelson has a BS in Engineering from Iowa State University and is a member of the National Storm Shelter Association (NSSA) Design Practices Committee. He has extensive experience in product design, product testing and product certification. He is currently responsible for the tornado and hurricane products in the ASSA ABLOY Door Group. He is also responsible for the operation of their product test lab.


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Bryan Sy

Principal Consultant & Regional Engineer

Mr. Sy is the Principal Consultant and Regional Engineer for PSI’s Special Inspection and Construction Material Testing Service Line in the Dallas – Fort Worth Metroplex. He currently serves as the Material Testing Engineer overseeing materials testing laboratory, field inspection and testing operations. Mr. Sy has 11 years of experience and provides oversight of special inspection and construction materials testing services of construction activities, including the special inspections and code-required structural observations of some recent ICC 500 tornado shelters for 4 new schools in Marshall, Texas.


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340861 - Guidelines for Engineering Judgment in Tornado Shelter Design

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