Thank-you for the serial number info. It would appear that your frame was made in 1989. It's a bit of a suprise to see Triomphe, as I thought it had been discontinued in 1988 and replaced by Athena for 1989.
Regardless, I could find no 1989 bicycles equipped with Triomphe. However, I found a handful of comparable Triomphe equipped bicycles for 1987-1988, by Italian firms such as Bottechia and Fiorelli. These bicycles had list prices of $700.00 - $750.00 US. Victory equipped bicycles were around $900.00 - $1000.00 US. I would expect the Bianchi to have been comparbly priced. The current value depends on the condition (both cosmetic and mechanical) and the market demand. Bianchi is a well recognized brand, as is Camapgnolo, however, Triomphe was not a popular group. Still I would expect the bicycle to hold it's value better than a Shimano 600 equipped bicycle of the era, which were comparably priced. I'd suggest tracking some comparable bicycles on Ebay to get an idea of the marketplace value. You may not find a Triomphe equipped bicycle, but you should be able to find several Shimano 600 equipped bicycles from the late 1980s.