TY JOUR TI REDUCING FIRE DANGER CULTURAL HERITAGE SITES WITH A HIGH FIRE LOAD KW cultural heritage sites KW fire hazard KW fire load KW fire automation systems KW digital twin KW fire protection KW preventive protection JO Problems of risk management in the technosphere AU Akterskiy, Y.E. AU Shupnev, D.S. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia