| Title |
Insulation Planning and Evaluation of PC(Precast Concrete) Sandwich Panel Joints to Improve the Insulation Performance of the Exterior Walls of Load-bearing Wall Type PC Apartment Buildings |
| Authors |
주나영(Joo, Na-Young) ; 송승영(Song, Seung-Yeong) |
| DOI |
https://doi.org/10.5659/JAIK.2025.41.11.249 |
| Keywords |
Load-bearing Wall Type; Apartment Building; Insulation; Thermal Bridge; Precast Concrete |
| Abstract |
This study analyzes strategies to enhance the thermal performance of precast concrete (PC) sandwich panels in high-insulation exterior walls
in load-bearing wall-type PC apartment buildings, focusing on mid-layer insulation thickness, connector material, high-performance insulation,
and joint detailing. Simulation results showed that, for a sandwich panel with a mid-layer thickness of 50mm, the effective U-value decreased
by 18.6 % for steel, 22.6 % for stainless steel, and 25.7 % for GFRP compared to a single panel. Notably, unlike other materials, GFRP
maintained continuous performance improvement even at a thickness of 190mm, demonstrating its high effectiveness in reducing thermal
bridging and enhancing insulation performance in thick mid-layer insulation designs. However, from a structural stability and constructability
standpoint, steel connectors remain the most practical choice, while GFRP and stainless steel could serve as viable alternatives with further
technological development and standardization. The application of high-performance insulation can reduce the required insulation thickness,
thereby shortening connector length, mitigating thermal bridging, and contributing to panel weight reduction. Finally, applying improved joint
details further reduced the effective U-value by up to 2.7 %. These findings highlight the necessity of optimizing connector and insulation
design to balance thermal performance, structural stability, and economic feasibility in high-performance building envelope design. |