Structural performance and numerical analysis of parapet thermal bridge solutions with cellulose fiber reinforced cement board and different reinforcement layouts for residential buildings

Abstract

This study constructed and used a thermal bridge for residential structures to improve heat transmission between the wall and parapet. The research objectives included assessing load capacity at the wall and parapet connection locations, using reinforcing bar connections, as well as developing a design specifically adapted to address the conditions resulting from bending moment scenarios. The experimental program tested three specimens, with two featuring Cellulose Fiber Reinforced Cement Board (CRC) and the third without CRC. Detailed experiments and parametric analyses were conducted to evaluate the structural performance, including the influence of varying reinforcement configurations and the presence of CRC boards. The outcomes showed that the presence of CRC and an increased number of reinforcing bar connections significantly enhanced the structural load capacity. Finite Element (FE) simulations using the LS-DYNA program were employed to validate the experimental results, demonstrating good agreement and confirming the accuracy of the model. In addition, the effect of the shape of the reinforcing bar connections was investigated, providing valuable insights into the mechanical response of thermal bridge components in buildings and indicating that the proposed connection design can effectively enhance structural performance by improving load-bearing capacity. © 2025 Elsevier Ltd