Work

Size effect on the fire resistance of multilayer composite floor structures

Year: 2025

Type: article

Abstract: The current standard methods for evaluating the fire resistance of high-speed train floor structures involve large-scale experiments that incur significant costs. To explore the feasibility of reducing the scale of these structural fire resistance tests , this study develops a two-dimensional numerical simulation model to assess the fire resistance of multilayer floor structures. The model's accuracy and applicability are rigorously validated through various fire resistance experiments conducted at multiple scales. The study emphasizes the dynamic thermal response of high-speed train floor structures, demonstrating a clear correlation between structural scale and fire resistance. Notably, the times to thermal insulation failure and integrity failure of multilayer composite floor structures decrease progressively with increasing scale. This trend can be described by an exponential function. Additionally, the model is employed to examine the effect of the ratio of the exposed surface size to the actual material size on fire resistance, with larger ratios leading to more rapid fire resistance failures.

Source: International Journal of Thermal Sciences

DOI: 10.1016/j.ijthermalsci.2025.109861

Authors: Junhao Gao, Jie Xu, Jin Lin, Shouxiang Lu

Institutions: University of Science and Technology of China, State Key Laboratory of Fire Science

Language: English

Topic: Fire effects on concrete materials

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,920

Funders: National Natural Science Foundation of China, Fundamental Research Funds for the Central Universities