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As part of its HVDC Pole 3 project, Transpower commissioned Beca to provide the detailed assessment and strengthening design for the existing Haywards Synchronous Condenser Transformer building. Earthquake effects up to a 2500 year return period event were considered. Existing schematic studies had concluded that a downslope sliding displacement of...
Contexts in source publication
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... and horizontal response spectra at both the condenser and transformer base levels have been determined for the existing structure prior to any strengthening works, and also for the structure after strengthening works have been accounted for. Figure 10 shows the horizontal response at transformer level from three earthquakes and Figure 11 shows the recommended response spectrum derived from these. Figures 12 and 13 correspond for the as-strengthened building. ...
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... and horizontal response spectra at both the condenser and transformer base levels have been determined for the existing structure prior to any strengthening works, and also for the structure after strengthening works have been accounted for. Figure 10 shows the horizontal response at transformer level from three earthquakes and Figure 11 shows the recommended response spectrum derived from these. Figures 12 and 13 correspond for the as-strengthened building. ...
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... 10 shows the horizontal response at transformer level from three earthquakes and Figure 11 shows the recommended response spectrum derived from these. Figures 12 and 13 correspond for the as-strengthened building. 14 -17 provide a comparison between the output response spectra at the transformer and condenser slab levels for the un-strengthened base building, for the strengthened building, and the underlying GNS input rock spectrum. ...
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... the condenser level, there is noticeably less amplification over the bed-rock acceleration, because most of the effect is derived from rocking of the walls above this level. Figure 18 shows the reduction in peak acceleration that can be achieved if rear anchors were used for additional strengthening. This reduction would not be as great at the condenser level. ...
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... reduction would not be as great at the condenser level. 5.2 Soil effect -pinned vs sprung Figure 19 shows the significant difference in the transformer level spectrum when soil springs are modelled as opposed to assuming a fixed-base structure. The sprung response spectrum is taken from the un-strengthened structure. ...
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... sensitivity to spring stiffness values was considered acceptable when compared with the other potential sensitivities. Figure 21 indicates the difference in peak response when a different initial damping value is chosen. This represents the damping inherent in the structure itself, and does not include damping from the non-linear soil springs which is calculated intrinsically. ...
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