Thermal performance of damaged bulk grain warehouse walls under cyclic loading

Within the 0.3 to 0.5 times loading range, the wall entered a phase of accelerated damage development, whereas from 0.5 to 0.7 times, damage progression stabilized. The extent of brick wall damage directly governs thermal performance, with greater damage yielding both reduced thermal resistance and an increased heat transfer coefficient. The mid-height section of the wall consistently exhibited the most severe damage across all loading levels.

When subjected to loads ranging from 0.3 to 0.7 times the cracking load, the damage coefficient increased from 0.26 to 0.44, accompanied by a 27.45% reduction in thermal resistance and a 26.97% increase in the heat transfer coefficient. Combining mechanical damage test results across varying loading magnitudes and cycle counts with thermal performance characterization data, two quantitative relationship models between the damage coefficient of brick walls and loading parameter and the heat transfer coefficient of damaged brick walls and the damage coefficient were obtained through fitting.