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