Sirte is the most significant IS stronghold outside Iraq and Syria.
Air and missile strikes have hit IS positions this week, officials said. A spokesman said troops were moving closer to the city centre.
The forces, aligned to the UN-backed unity government in Tripoli, began the battle to retake the city last month.
A spokesman, Ahmed Hadia, told the BBC IS forces had weakened, but "not totally broken down".
He said the troops were encircling part of the city.
Why is Libya so lawless?
Life in Libya under IS
Clashes centred on the Ougadougou conference centre, which was once a venue for international summits but has now become an IS command centre.
Forces loyal to the government targeted the conference centre with heavy artillery fire, backed by warplanes.
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