Simulation Study of Fire Spread on Exterior Wall of Twin-Tower High-Rise Building Linked with Connective Structures

When a fire occurs in a Twin-tower high-rise building linked with connective structures, it will spread laterally through the connective structures, causing greater damage. In this paper, PyroSim is used to simulate the whole process of the “8·27” fire in Dalian Kaixuan International Building. The results show that within 50s, the compartment fire overflow occurs, the flame spreads upward at a speed of 0.79 m/s, and spreads to the top of the tower at 86 s. It spreads horizontally at a speed of 0.54 m/s, and 126 s spreads to another tower; The local maximum temperature of the outer surface of the tower fire area is 1200 °C. The maximum temperature of the outer surface of the corridor is 1143.13 °C. The concentration of CO in all rooms of the corridor in the burned area exceeded the critical concentration leading to death. When the flame passes through the corridor to another tower, the maximum temperature is 524.40 °C lower than before.