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University of Toledo

1. Khanal, Abhisek. Review of Hollow Core Floor Slab in New Zealand – History of Practice, Past Research, and Failure Modes Seen in Research and Recent Earthquakes.

Degree: MS, Civil Engineering, 2019, University of Toledo

This thesis is a review of research on Hollow core floors in New Zealand. It looks at the research on hollow core floors, from 1990s onwards, and traces the understanding of the its performance. Each experiment from these researches were investigated for a pattern among the base variables. However, the research conducted so far, has enough variability among them that an overarching conclusion on performance of Hollow core floors is not reached. With the building boom of the 1980s, the push for multi-story structures made use of precast concrete frame elements ubiquitous. Hollow core floor elements were designed to behave as a simply supported system thought to fail by losing its vertical support and have no significant seismic interaction. However, the Northridge Earthquake 1994 proved otherwise—hollow core floors failed because of a different mechanism. This failure mechanism was reproduced by Matthews (2004) in a super-assembly test. The principal damage was from the relative rotation between the support beam and the hollow core unit as well as the elongation of connection to the support beam as assumed by previous research. This evoked research of hollow core floor connections and from that research, various connections details were proposed. The research moved along two paths—first to understand the behavior (and ultimately retrofit) hollow core connection details of the 1980s and 1990s (a typical connection), and second to propose new connection details for new construction. Lindsay (2004) and MacPherson (2005) conducted a super-assembly test on connection details proposed by NZS 3101:1995 Amendment 3. These new connection details performed much better than the existing connection details. Bull and Matthews (2004) proposed and conducted research on the connection of a hollow core floor slab to the support beam in a sub-assembly test. The sub-assembly test successfully recreated the major failure modes of the super-assembly test. The sub-assembly test was then used by researchers Liew (2004), MacPherson (2005), Jensen (2006), and Woods (2008) to investigate the performance of hollow core floor slabs with varying connection details. This research added to the understanding of hollow core behavior; however, many failure mechanisms were not well understood.The hollow core flooring system was not `tested’ by the Christchurch Earthquake. Only minor damage was seen in hollow core flooring units. However, much damage was seen in hollow core flooring systems in the Kaikoura Earthquake. Most of the damage was either reproduced in the lab or predicted by 2D analytical studies. However, some of the damage seen had not been envisioned and this damage needs to be understood. Overall, it was not possible to draw an overarching conclusion from the existing body of NZ research because a) each experiment used different values for the basic variable, do direct comparison was impossible, b) no experiments were repeated, and c) no analytical framework was used in experimental design. Advisors/Committee Members: Nims, Douglas (Committee Chair).

Subjects/Keywords: Civil Engineering; Hollow-core floors; New Zealand

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APA (6th Edition):

Khanal, A. (2019). Review of Hollow Core Floor Slab in New Zealand – History of Practice, Past Research, and Failure Modes Seen in Research and Recent Earthquakes. (Masters Thesis). University of Toledo. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=toledo1564480135728695

Chicago Manual of Style (16th Edition):

Khanal, Abhisek. “Review of Hollow Core Floor Slab in New Zealand – History of Practice, Past Research, and Failure Modes Seen in Research and Recent Earthquakes.” 2019. Masters Thesis, University of Toledo. Accessed September 19, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1564480135728695.

MLA Handbook (7th Edition):

Khanal, Abhisek. “Review of Hollow Core Floor Slab in New Zealand – History of Practice, Past Research, and Failure Modes Seen in Research and Recent Earthquakes.” 2019. Web. 19 Sep 2019.

Vancouver:

Khanal A. Review of Hollow Core Floor Slab in New Zealand – History of Practice, Past Research, and Failure Modes Seen in Research and Recent Earthquakes. [Internet] [Masters thesis]. University of Toledo; 2019. [cited 2019 Sep 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=toledo1564480135728695.

Council of Science Editors:

Khanal A. Review of Hollow Core Floor Slab in New Zealand – History of Practice, Past Research, and Failure Modes Seen in Research and Recent Earthquakes. [Masters Thesis]. University of Toledo; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=toledo1564480135728695

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