Structural Analysis
ZHANG Huiqin, HU Kexu, LI Zongyuan, BAI Xue
This study investigates the fire performance of connections between curtain walls and primary structures. Utilizing Pyrosim software and the t² quasi-steady fire growth model, numerical simulations of the full fire development process were conducted across five representative architectural spaces： administrative offices, general offices, retail apparel stores, hotel rooms, and residential bedrooms, to characterize the temperature field at the connection interface. Subsequently, ABAQUS finite element analysis was employed to simulate the internal temperature profiles of concrete substrates and connectors under the most severe fire scenario. Accounting for high-temperature-induced material degradation, the load-bearing capacities of critical connection components were evaluated, including steel angle brackets, bolts, embedded parts （cast-in claw, cast-in channel, and chemical anchors）, and welds. Results indicate that temperatures at fire-stop seals exceed 600 ℃ during fire exposure, revealing a detachment risk in conventional seal assemblies comprising galvanized steel sheets and rock wool. Exposed components （e.g., steel brackets, bolts, welds） and chemical anchor systems fail to meet fire-resistance requirements, whereas cast-in claw and channel embedded parts demonstrate adequate capacity. The study recommends prioritizing cast-in embedded systems in design, enhancing the fire resistance of fire-stop seals, applying supplementary fire protection to connection elements, and incorporating appropriate capacity redundancy to ensure structural integrity under fire conditions.
