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Concrete In Australia : June 2013
Concrete in Australia Vol 39 No 2 27 completely wrong. Admittedly, the webs are now generally not less than 110mm, but with that change the T-roff version now has nearly 20 years of proven performance. Some innovations in Super Tees Apart from the NSW improvement of open tops, some other innovations of which I am aware are: • Western Australian Super Tees are typically wider than the earlier versions. Figure 1 shows a Western Australian version, which is as wide as it is practicable to transport (about 4.2m). is reduces the number needed per structure, reducing time on site and improving appearance. In fact, the size seems to be getting even larger -- a 5m-wide, 43m-long beam has recently been precast and transported in Western Australia. Versions more commonly used elsewhere are shown in the Australian Bridge Code: AS5100.5 Appendix H. • Earlier versions tended to use transverse diaphragm beams (usually half web depth) for torsional fixity at internal piers, but analysis has shown that this is unnecessary even for quite long multispan bridges. is simplifies both precasting in the end zones and on site works. It also gives visually much cleaner lines. Why are Super Tees so dominant in the market? e short answer to this question is that they are the lowest cost solution upfront by far, and they provide the owner (Transport Authority) with all the advantages of durability and low maintenance which concrete can offer, so their whole of life costs are absolutely unassailable. However, to make such a statement, especially as they have by no means taken over the whole world (at least not yet), we need to look at their competitors. e curse of being a bridge engineer is that when driving around, whether in Australia or other countries, or just observing bridges in movies or TV shows or print media, you Figure 2. A basic range of generic concrete bridge types.