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Seismic evaluation of the northbound N1/R300 bridge interchange

dc.contributor.authorSolms, M. N.en_ZA
dc.contributor.authorHaas, T. N.en_ZA
dc.date.accessioned2017-07-12T13:56:22Z
dc.date.available2017-07-12T13:56:22Z
dc.date.issued2016
dc.identifier.citationSolms, M. N. & Haas, T. N. 2016. Seismic evaluation of the northbound N1/R300 bridge interchange. Journal of the South African Institution of Civil Engineering, 58(4):62-71, doi:10.17159/2309-8775/2016/v58n4a7.
dc.identifier.issn2309-8775 (online)
dc.identifier.issn1021-2019 (print)
dc.identifier.otherdoi:10.17159/2309-8775/2016/v58n4a7
dc.identifier.urihttp://hdl.handle.net/10019.1/101961
dc.descriptionCITATION: Solms, M. N. & Haas, T. N. 2016. Seismic evaluation of the northbound N1/R300 bridge interchange. Journal of the South African Institution of Civil Engineering, 58(4):62-71, doi:10.17159/2309-8775/2016/v58n4a7.
dc.descriptionThe original publication is available at http://www.scielo.org.za
dc.description.abstractThe design of the Stellenberg Interchange was finalised in 1982, with construction completed in 1986. The bridge was designed using a code of practice which did not include any requirements for seismic excitation. This code was superseded by the Code of Practice for the Design of Highway Bridges and Culverts, which provides detailed analysis guidelines for bridges located in seismic-prone areas. According to this code, the bridge is located in a seismic-prone area with an anticipated peak ground acceleration of 0.1 g. Current research suggests that this region could be exposed to a peak ground acceleration of approximately 0.2 g. Upon inspection of the bridge, it was noted that the bridge does not conform to modern-day best practice guidelines for bridges located in seismic-prone regions. These factors necessitated an exploratory investigation to determine whether the bridge can sustain earthquake magnitudes between 0.05 g and 0.2 g. The study was conducted by experimentally determining the natural frequencies with its corresponding mode shapes, which were used to calibrate a finite element model. The finite element model was subjected to different magnitude earthquakes to determine its structural integrity. The results show that, for an earthquake of 0.1 g, the bending moment at one of the column bases is exceeded, while two other column base moments are within 15% of its design capacity. For a 0.2 g magnitude earthquake, the design bending moments at five columns are significantly exceeded, while three other columns' design moments are close to being exceeded. The exceedance of the design moments could lead to significant damage, with the possibility of collapse of the bridge.en_ZA
dc.format.extent10 pages
dc.language.isoen_ZAen_ZA
dc.publisherSouth African Institution of Civil Engineering
dc.subjectBridges -- Design and constructionen_ZA
dc.subjectStellenberg interchange -- Seismic evaluationen_ZA
dc.subjectEarthquake resistant designen_ZA
dc.titleSeismic evaluation of the northbound N1/R300 bridge interchangeen_ZA
dc.typeArticleen_ZA
dc.description.versionPublisher's version
dc.rights.holderAuthors retain copyright


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