Theses and Dissertations at Montana State University (MSU)
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Item Pilot study of a high capacity ductile seismic holdown for cross laminated timber(Montana State University - Bozeman, College of Engineering, 2019) Nicholas, John Howison; Chairperson, Graduate Committee: Damon FickNew manufactured wood products referred to as mass timber have allowed for greater seismic load capacities than ever before for designing wood structures. The increased capacities could allow for taller wood structures; however, traditional wood connections do not meet the seismic performance needs for new manufactured wood products such as cross laminated timber (CLT). New connection methods must be investigated to allow for the growth of the CLT industry in mid- and high-rise structures. The objective of this research is to develop a wood connection to resist larger uplift forces experienced in CLT structures and provide energy dissipation in seismic events. The connection development was performed through fastener testing using self-drilling dowel fasteners for concealed connections with steel knife plates installed in a wood member. Finite element modeling and testing of reduced section steel plate to provide a ductile response to cyclic loading was performed to determine the feasibility of this connections style. The results of the investigation indicate that reduced section steel plates that limit the connection failure to a desired location in the steel plate could greatly increase the seismic performance of CLT seismic force resisting systems.Item The effect of natural disaster on individual-level aspiration: evidence from rural Nepal(Montana State University - Bozeman, College of Agriculture, 2019) Shrestha, Samyam; Chairperson, Graduate Committee: Diane CharltonIn this study, I analyze the effect of the 2015 Nepal earthquake on individual-level aspiration. I use the data from a longitudinal household survey in rural Nepal from 2014 and 2016, and the earthquake intensity data from the United States Geological Survey (USGS). Using a fixed effects model, I find that compared to those who experienced below median earthquake intensity in terms of Modified Mercalli Scale (MMI), those who experienced MMI between the 50th and 75th percentile had their aspiration index drop by 0.14 of a standard deviation. Similarly, the drop was 0.33 of a standard deviation for those experiencing MMI more than 75th percentile. This finding adds to the literature that natural disaster not only damages physical infrastructure but also curtails individual's overall aspiration, which, as the economic literature illustrates, has a negative effect on investment. There was, however, no consistent statistically significant effects on the individual components of aspiration.Item Curvature ductility of reinforced and prestressed concrete columns(Montana State University - Bozeman, College of Engineering, 1984) Suprenant, Bruce AlanEngineers are concerned with the survival of reinforced and prestressed concrete columns during earthquakes. The prediction of column survival can be deduced from moment-curvature curves of the column section. An analytical approach is incorporated into a computer model. The computer program is based on assumed stress-strain relations for confined and unconfined concrete, nonprestressed and prestressing steel. The results of studies on reinforced and prestressed concrete columns indicate that reinforced concrete columns may be designed to resist earthquakes, while prestressed concrete columns may not. The initial reduction in moment capacity, after concrete cover spalling, of a prestressed concrete column could be as much as 50%. Analyses indicate that the bond between concrete and prestressing strand after concrete cover spalling is not critical.Item Quaternary tectonic activity within the northern arm of the Yellowstone tectonic parabola and associated seismic hazards, southwest Montana(Montana State University - Bozeman, College of Letters & Science, 2002) Ruleman, Chester AllanItem Research on earthquake resistant structures(Montana State University - Bozeman, College of Engineering, 1949) Markellis, Constantine A.