http://yetl.yabesh.ir/yetl1/handle/yetl/19015 2026-04-22T05:53:29Z 2026-04-22T05:53:29Z Shengsheng Yu Mingyi Zhang Xiyin Zhang Wanping Wang http://yetl.yabesh.ir/yetl1/handle/yetl/4309382 2026-02-16T21:33:30Z 2025-01-01T00:00:00Z

Lateral Performance of Bridge Pile Foundations in Seasonally Frozen Soils Considering Ground Scour Effect Shengsheng Yu; Mingyi Zhang; Xiyin Zhang; Wanping Wang This study presents experimental results from scale model tests on laterally loaded bridge pile foundations in soils subjected to seasonal freezing. A refined finite-element model (FEM) was established and calibrated based on data obtained from the experiments. Furthermore, the model was utilized to investigate the impact of soil scouring depth on the lateral behavior of bridge pile foundations embedded in seasonally frozen soils. The findings indicate that soil freezing significantly enhances the lateral bearing capacity of the pile–soil interaction (PSI) system while reducing lateral deflection of the pile foundation. However, soil freezing results in increased damage to the pile foundation and upward movement of the plastic zone toward the ground surface. Under unfrozen conditions, significant plastic deformations occur on the ground surface and even inside the piles due to the extrusion effect. Additionally, increasing soil scouring depth significantly reduces the lateral bearing capacity of the PSI system while also increasing lateral deflection of the pile foundation for a given load level. Notably, when the scouring depth exceeds 2 m in unfrozen soils, the entire pile experiences obvious deformation and inclination, exhibiting a short-pile behavior that negatively affects the lateral stability of the pile under lateral loads.

2025-01-01T00:00:00Z Feng Yang Lei Xia Xiangkun Wang Yao Wang Chongyang Feng http://yetl.yabesh.ir/yetl1/handle/yetl/4309381 2026-02-16T21:33:24Z 2025-01-01T00:00:00Z

Impact Patterns of Transmission Line Icing in Microterrain and Micrometeorological Environments Feng Yang; Lei Xia; Xiangkun Wang; Yao Wang; Chongyang Feng The icing of transmission lines poses significant challenges to the stability of the power system, leading to increased loads, imbalanced tensions, and galloping. This paper specifically investigates the icing formation on braided wire cylinders. A three-dimensional braided conductor icing finite-element model is developed based on the icing theory model. Wind field simulations are conducted over mountainous terrains, and wind field acceleration ratio contour maps are analyzed. In order to investigate the effects of different factors on the icing morphology of conductors, the paper finally simulates and computes the icing of conductors under microterrain and micrometeorological conditions under varying ambient temperatures, wind speeds, median volume diameters, and liquid water content in the air. The findings demonstrate that the amount of conductor icing has a negative association with temperature and a positive correlation with wind speed, median volume diameter, and air liquid water content. Temperature and median volume diameter have less of an effect on the icing morphology than wind speed and the amount of liquid water in the air.

2025-01-01T00:00:00Z Wenting Li Zhengwu Jiang Qing Chen Qiyu Zhang http://yetl.yabesh.ir/yetl1/handle/yetl/4309380 2026-02-16T21:33:22Z 2025-01-01T00:00:00Z

Potential of Utilizing Form-Stable Phase Change Materials to Improve Freeze–Thaw Resistance of Mortar with Varying Water Content Wenting Li; Zhengwu Jiang; Qing Chen; Qiyu Zhang There have been numerous reports that the incorporation of phase change materials (PCMs) in concrete, which act by the release of latent heat, is a promising solution for melting snow, deicing, and improved freeze–thaw durability. For an in-depth understanding of PCMs for future application in practical construction, in this study, the effect of PCMs on the thermal performance of mortar containing various proportions of water was further investigated in terms of the degree of saturation (DOS), based on longitudinal guarded comparative calorimetry (LGCC). The exothermic peak during the phase transition of PCMs with added water was quantitatively determined using heat flow curves. The results indicate that the freezing point of water was depressed with respect to the bulk liquid, and that a lower DOS contributes to a higher degree of depression. Ice formation was effectively inhibited when the heat released by the PCMs was larger than that released by water. The reduction in the amount of frozen water caused by the addition of PCMs can be seen as having a similar effect as increasing the critical DOS to trigger damage. Additions of 30% and 50% PCMs could equivalently increase the critical DOS to 90%–95% and 95%–100%, respectively.

2025-01-01T00:00:00Z Wuyu Zhang Yuling Huang Cheng Lin Banglong Xie http://yetl.yabesh.ir/yetl1/handle/yetl/4307346 2025-08-17T22:43:17Z 2025-01-01T00:00:00Z

Mechanical and Thermal Properties of Lignin Fiber–Reinforced Loess Subjected to Freeze–Thaw Cycles Wuyu Zhang; Yuling Huang; Cheng Lin; Banglong Xie As a derivative of woods, lignin fibers are considered a sustainable material for stabilizing soils. However, their applications in loess in seasonally frozen regions and the underlying mechanisms of loess reinforcement are not well understood. This study conducted a series of laboratory tests to investigate the effects of lignin fiber content and freeze–thaw cycles on the mechanical and thermal properties of lignin fiber–reinforced loess, followed by an experimental investigation into the microstructure and mineralogy of the reinforced loess. The results showed that the addition of lignin fibers increased both strength and ductility and drastically reduced the thermal conductivity of loess. In the repeated freeze–thaw condition, the unreinforced loess exhibited a slight increase in brittleness whereas the lignin fiber–reinforced loess showed an overall increase in ductility. The reinforcement of lignin fibers was found to be primarily attributed to bridging loess particles while reducing pore size and connectivity.

2025-01-01T00:00:00Z