HEAT-EFFICIENT SOLUTIONS FOR WALL-BASEMENT SLAB CONNECTIONS IN LIGHTWEIGHT STEEL-FRAMED CONSTRUCTIONS FOR ARCTIC REGIONS

Terentii Kornilov, Alexey Kornilov

Abstract


Introduction: In Arctic regions, due to the scattered layout of settlements across vast territories and low population density, combined with logistical and transport difficulties, one of the promising technologies is the construction of rapidly erected buildings based on lightweight steel-framed (LSF) constructions. Thermal protection of such buildings in climatic conditions with design outdoor air temperatures of −44 °C to −58 °C is a relevant and complex challenge, especially due to the presence of thermal bridges in the form of steel profiles. Operational experience with LSF buildings on pile foundations shows that the main problems arise on the ground floor where a ventilated crawl space is used to preserve frozen soil. Objective: Development of heat-efficient solutions for wall-basement slab connections in LSF buildings for Arctic regions with extreme climatic conditions. Methods: To reduce the impact of thermal bridges in the form of steel profiles at the wall-basement slab connection, the use of thermal break (TB) beams is proposed. Numerical simulations of 3D models of different types of wall-basement slab connections were conducted using the certified HEAT 3 software. The results were compared with typical structures based on minimum interior surface temperature, heat losses, and effective thermal resistance. Results: As a result of implementing the new design, the influence of thermal bridges was minimized by shifting the steel profiles into the warm zone, creating a thermal break using beams, and maintaining the continuity of the building’s thermal envelope. At an outdoor temperature of −55 °C, the minimum interior surface temperature in the wall-basement slab connections, unlike in typical solutions, exceeds the dew point. Compared to standard solutions, reduced thermal resistance of the external wall-basement slab connection were increased by 8.1 %, and the partition wall-basement slab connection — by 15.4 %.

Keywords


thermal bridge; lightweight steel-framed (LSF) constructions; thermal break; wall-basement slab connection; thermal resistance

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References


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