Date of Award

Spring 5-5-2017

Degree Type

Report

Degree Name

Master of Science (MS)

Department

Civil and Environmental Engineering

First Advisor

Dr. Marc Maguire

Abstract

A key challenge in the field of engineering is finding good balance between safety and economy. Extreme safety comes at a high cost, while highly economical yet unsafe situations lead to disaster. The purpose of this project was to analyze the reliability of a newly developed buckling design equation to be used in the design of top chords of open-web joists used in standing seam roof systems.

The analysis considered four different safety factors with a focus on finding whether or not a standard ASD safety factor of 1.67 would be adequate from a safety perspective. Using Monte Carlo simulation techniques, many cases were considered including: various top chord sizes, overall lengths, unbraced lengths, and load types and amounts. This was done to ensure the validity of the reliability-based conclusion drawn. A target reliability index of 3.5 was selected based on building code requirements.

It was determined that overall length and unbraced length did not have a significant impact on the reliability of the structure. It was also determined that a factor of safety of 1.67 can be considered both safe and economical and is recommended for use.

Comments

A key challenge in the field of engineering is finding good balance between safety and economy. Extreme safety comes at a high cost, while highly economical yet unsafe situations lead to disaster. The purpose of this project was to analyze the reliability of a newly developed buckling design equation to be used in the design of top chords of open-web joists used in standing seam roof systems.

The analysis considered four different safety factors with a focus on finding whether or not a standard ASD safety factor of 1.67 would be adequate from a safety perspective. Using Monte Carlo simulation techniques, many cases were considered including: various top chord sizes, overall lengths, unbraced lengths, and load types and amounts. This was done to ensure the validity of the reliability-based conclusion drawn. A target reliability index of 3.5 was selected based on building code requirements.

It was determined that overall length and unbraced length did not have a significant impact on the reliability of the structure. It was also determined that a factor of safety of 1.67 can be considered both safe and economical and is recommended for use.

Available for download on Sunday, May 05, 3022

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