Browsing by Author "Solms, Michael Nicolas"
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- ItemSeismic evaluation of the north bound N1-R300 bridge interchange(Stellenbosch : Stellenbosch University, 2015-12) Solms, Michael Nicolas; Haas, Trevor; Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering.ENGLISH ABSTRACT: The N1 / R300 or Stellenberg interchange was designed in 1982 and construction was completed in early 1986. The bridge was designed according to the Code of procedure for the Design of Provincial Bridges and Culverts published by the Cape Province Department of Roads in June 1977. The design of the bridge over the N1 did not account for any significant form of seismic excitation but a review of current design code states that it falls within the highest seismic risk bracket in South Africa. Although this highest risk bracket still only equates to a moderate intensity earthquake, structures not designed accordingly could undergo serious damage. Current research suggests that the maximum possible peak ground acceleration expected in the region is almost double the modern design requirements. Additionally, numerous features of the bridge do not agree with many of the recommended best practices for bridges in seismic prone areas. This study evaluates the structural response of the Stellenberg interchange bridge when subjected to moderate intensity earthquakes. This was achieved through experimental tests to determine the mode shapes and accompanying frequencies to calibrate the finite element model of the horizontal circular arch bridge. A detailed finite element model was developed using Abaqus software. Once the finite element model was calibrated, the model was subjected to various scaled earthquakes to determine whether the bridge would be able to sustain a moderate intensity earthquake.