We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Research on Temperature Deformation and Damage of Unitization of Longitudinally Connected Slab Ballastless Track Under Limiting Condition.
- Authors
LIN Jinzhen; JIANG Dianyou; LIU Yu; SUN Xiaodan; YANG Huaizhi; GU Yonglei
- Abstract
This paper presents a proposal to cut the longitudinally connected slab ballastless track structure into discrete units with a certain length so as to control the damage caused by excessive temperature rise and accordingly reduce the risk of instability of track structure. The temperature deformation of the unit track structure needs to be constrained by some measures. By two displacement-limiting measures such as planting rebar and installing pressing device, the temperature deformation and damage of longitudinally connected slab ballastless track with different segment lengths are investigated in a numerical way. Results show that for the longitudinal deformation of both ends of the segment, the effect of planting rebar is more obvious than that of installing pressing device. For the longitudinal deformation of the slab corner of the segment end, the effects of two displacement-limiting measures are very close; The planting rebar is better to overall control the relative longitudinal displacement between the track slab and the CA mortar layer, and the installing pressing device has control advantage at the slab corner. When the rebar is planted, the segment length has little influence on the concrete damage of the rebar holes; While the pressing device is installed, the influence of the segment length on the concrete damage of slab corner is small under the overall temperature lower 5 °C, and becomes significant after the overall temperature rise over 5 °C. After the rebar is planted, the tensile damage first appears at the wall of the rebar hole, and the damaged area expands laterally with the temperature rising. After the pressing device is installed, the compressive damage first appears on the bottom surface of the track slab. As the temperature rises, the damage area expands upwards to the top surface of the track slab. For the interface damage, the differences in the influence between the two displacement-limiting measures are remarkable. The total delamination area reduced by planting rebar measure is larger, while delamination at the slab corner is better controlled by the installing pressing device measure. The temperature deformation and damage are controlled by choosing 3 slabs as a segment and using planting rebar measures.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 2, p45
- ISSN
1004-2954
- Publication type
Academic Journal
- DOI
10.13238/j.issn.1004-2954.202207280004