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Experimental and Analytical Assessment on the Progressive Collapse Potential of a Reinforced Concrete Building

Betit, Brett Alexander
http://orcid.org/0000-0002-0453-4873
http://rave.ohiolink.edu/etdc/view?acc_num=osu1637592099747652

Abstract Details

2021, Master of Science, Ohio State University, Civil Engineering.
The progressive collapse of a structure is of critical concern to structural design engineers as the progressive collapse can lead to tragic loss of life. Due to this major threat posed by progressive collapse, building design and analysis has pivoted to account for the prevention of progressive collapse as a structural design requirement. Years of research has already been undertaken to better understand progressive collapse in order to improve building structural design as well as develop new modeling techniques to evaluate existing structures for their progressive collapse potential. These computer models and analysis techniques still require data from field experiments in order to verify their effectiveness at evaluating progressive collapse potential. The goal of this research was to provide structural engineers with a better understanding of the progressive collapse behavior of buildings in order to refine the guidelines and approach to the design of new structures as well as the evaluation of existing structures for their progressive collapse potential. In this research both field experimentation and computer modeling for progressive collapse were conducted. The building tested was a reinforced concrete parking garage, North Cannon Parking Garage, located on The Ohio State University Medical Campus in Columbus, Ohio. The structure was tested by removing two load bearing columns. One removed column was supporting the roof helipad. The other removed column was in the fifth story directly below the first removed column location. During the column’s removal, changes in the strains of the columns adjacent to the column removed were measured as well as building vibrations in the area surrounding the column during its removal. The change in the strains in the adjacent columns were caused by the load redistribution in the building following the removal of the target column. LIDAR data was also collected before and after the column removals in order to measure any change in structural member lengths after the columns were removed. SAP2000 (2018) was the software used to conduct the modeling and analysis of the building using current GSA (2016) and UFC (2016) guidance. Three-dimensional (3-D) models were built using SAP2000 and evaluated for progressive collapse. Linear static and nonlinear dynamic analysis procedures used on the building models considered two load cases. The first load case was the unfactored dead load case. This was meant to represent the real-world loading conditions on the building during the column removals. The second load case was the factored dead load case. This was used in accordance with progressive collapse analysis guidance to determine the progressive collapse vulnerability of the building considering only the dead loads that were present during the experiment. Modal analysis was also conducted in SAP2000 to determine if the column removals altered the frequencies of the building. While the strain data was determined to be unusable due to external factors and noise in the data, preliminary summaries of ongoing LIDAR, accelerometer, and FLIR camera data analyses are presented in this thesis. Based off the current progressive collapse analysis procedures, the building was found to be vulnerable to progressive collapse based on the results of the linear static analysis. The nonlinear dynamic analysis results indicated the building would not be vulnerable to progressive collapse under its self-weight. Results of the unfactored dead load case for both linear static and nonlinear dynamic analysis indicated that the building behavior remained elastic even after both columns were removed. Modal analysis results of the building indicated that the mass and stiffness changes caused by the column removals only altered the first building frequency. This was due to the negligible change in mass and stiffness of the building over the course of the column removals.
Halil Sezen (Advisor)
Abdollah Shafieezadeh (Committee Member)
Daniel Pradel (Committee Member)
203 p.
Civil Engineering
Progressive collapse;

Recommended Citations

Citations

  • Betit, B. A. (2021). Experimental and Analytical Assessment on the Progressive Collapse Potential of a Reinforced Concrete Building [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1637592099747652

    APA Style (7th edition)

  • Betit, Brett. Experimental and Analytical Assessment on the Progressive Collapse Potential of a Reinforced Concrete Building. 2021. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1637592099747652.

    MLA Style (8th edition)

  • Betit, Brett. "Experimental and Analytical Assessment on the Progressive Collapse Potential of a Reinforced Concrete Building." Master's thesis, Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1637592099747652

    Chicago Manual of Style (17th edition)

osu1637592099747652
149
© 2021, some rights reserved.Creative Commons License Experimental and Analytical Assessment on the Progressive Collapse Potential of a Reinforced Concrete Building by Brett Alexander Betit is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.
Release 3.2.12