Experimental Snap Loading of Synthetic Fiber Ropes

dc.contributor.authorPearson, Nicholas Johnen
dc.contributor.committeechairPlaut, Raymond H.en
dc.contributor.committeememberMurray, Thomas M.en
dc.contributor.committeememberCharney, Finley A.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2014-03-14T20:30:33Zen
dc.date.adate2003-01-15en
dc.date.available2014-03-14T20:30:33Zen
dc.date.issued2002-12-12en
dc.date.rdate2004-01-15en
dc.date.sdate2003-01-13en
dc.description.abstractEnergy is lost when a rope transfers from a slack state to a taut state. This transfer is called a snap load and can be very violent. It is proposed to use synthetic fiber ropes as a type of passive control device in new or existing structures to mitigate seismic response. Experimental static and snap load (dynamic) tests were conducted on various synthetic fiber ropes. An eleven-foot-tall drop tower was built in the Virginia Tech Structures and Materials Laboratory in order to conduct these tests. Force and acceleration of the drop plate, which slides vertically within the drop tower, were measured with respect to time for all dynamic tests. Acceleration data was integrated using the trapezoidal or midpoint rule to obtain velocity and displacement values. Plots were made for each test in order to give a better representation of the results. These plots include representations of force and acceleration vs. time, force vs. absolute displacement, force vs. velocity, and force, acceleration, velocity, and displacement vs. time (during the initial taut phase only). Test results show that energy was dissipated in all of the dynamic drop tests, which was expected. Also, the displacement of each rope did not return to zero at the same time that the force returned to zero after the initial snap load. This proves that the ropes undergo some permanent elongation under load. The stiffness of each rope increased with continuous testing. As more tests are conducted on each rope, the strands are pulled tighter into the braided configuration, which causes the rope to become stiffer.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-01132003-105300en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01132003-105300/en
dc.identifier.urihttp://hdl.handle.net/10919/30925en
dc.publisherVirginia Techen
dc.relation.haspartReferencePage.pdfen
dc.relation.haspartCover.pdfen
dc.relation.haspartChapter1.pdfen
dc.relation.haspartChapter2.pdfen
dc.relation.haspartVita.pdfen
dc.relation.haspartFrontMatter.pdfen
dc.relation.haspartAppendixA.pdfen
dc.relation.haspartChapter5.pdfen
dc.relation.haspartAppendixB.pdfen
dc.relation.haspartChapter3.pdfen
dc.relation.haspartChapter4.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectCablesen
dc.subjectHysteresisen
dc.subjectSynthetic Fiber Ropesen
dc.subjectSnap Loadsen
dc.subjectDrop Testsen
dc.titleExperimental Snap Loading of Synthetic Fiber Ropesen
dc.typeThesisen
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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