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Jerome J. Connor. Boutin, Nathan D. (Nathan Daniel) Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering n-us-ma 2010-01-07T21:03:03Z 2010-01-07T21:03:03Z 2009 2009 http://hdl.handle.net/1721.1/50626 475716346 Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2009. Includes bibliographical references (leaf 40). Infrastructure in the United States is comprised of numerous structures that are decades old. The Longfellow Bridge is one of the oldest pieces of this infrastructure that is still in use and has become one of the most historic structures of the Boston area. Currently, the steel superstructure of the bridge is in poor condition while the masonry piers and abutments remain in good condition. In the near future, a major replacement of the superstructure will be required. In order for the masonry elements to be approved for a renewed design life, they must be assessed for their ability to withstand seismic loads. This assessment presents an investigation of original construction documents and identifies critical components of the bridge that require more in depth analysis. It also shows a qualitative review of expected seismic activity for the region surrounding Boston. A review of current theory related to unreinforced masonry structures is introduced and analysis is then performed on critical wall sections. Specific ground motions are applied using both constant acceleration and impulse loadings to the structure. The results of the analyses reveal a need for further investigation into retrofitting schemes as there is not a sufficient factor of safety that exists with certain pier elements. Furthermore, a failure envelope is developed and presented for several types of impulse loads in order to serve as a basis for understanding the behavioral response to potential earthquake loading. by Nathan D. Boutin. M.Eng. 50 leaves eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Civil and Environmental Engineering. Seismic assessment of unreinforced masonry structures : an investigation of the Longfellow Bridge masonry piers Thesis application/pdf Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="7d15c818-0d1a-4b5d-9d82-b22ce93e7eda"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Seismic assessment of unreinforced masonry structures : an investigation of the Longfellow Bridge masonry piers</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2009</PublicationDate> <Authors> <Author> <DisplayName>Boutin, Nathan D. (Nathan Daniel)</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Civil and Environmental Engineering.</Keyword> <Abstract>Infrastructure in the United States is comprised of numerous structures that are decades old. The Longfellow Bridge is one of the oldest pieces of this infrastructure that is still in use and has become one of the most historic structures of the Boston area. Currently, the steel superstructure of the bridge is in poor condition while the masonry piers and abutments remain in good condition. In the near future, a major replacement of the superstructure will be required. In order for the masonry elements to be approved for a renewed design life, they must be assessed for their ability to withstand seismic loads. This assessment presents an investigation of original construction documents and identifies critical components of the bridge that require more in depth analysis. It also shows a qualitative review of expected seismic activity for the region surrounding Boston. A review of current theory related to unreinforced masonry structures is introduced and analysis is then performed on critical wall sections. Specific ground motions are applied using both constant acceleration and impulse loadings to the structure. The results of the analyses reveal a need for further investigation into retrofitting schemes as there is not a sufficient factor of safety that exists with certain pier elements. Furthermore, a failure envelope is developed and presented for several types of impulse loads in order to serve as a basis for understanding the behavioral response to potential earthquake loading.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>