Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion Conditions
［Objective］To address the issues of reduced vibration isolation performance of floating slabs under water immersion, it is necessary to study the impact of train operating speed and steel spring isolator stiffness on vibration reduction under operational conditions. ［Method］Based on fluid-structure...
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| Format: | Article |
| Language: | zho |
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Urban Mass Transit Magazine Press
2024-12-01
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| Series: | Chengshi guidao jiaotong yanjiu |
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| Online Access: | https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.2024.12.014.html |
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| author | YUAN Dehao ZHANG Hongliang YANG Lin ZHOU Yu NIU Xiaoli |
| author_facet | YUAN Dehao ZHANG Hongliang YANG Lin ZHOU Yu NIU Xiaoli |
| author_sort | YUAN Dehao |
| collection | DOAJ |
| description | ［Objective］To address the issues of reduced vibration isolation performance of floating slabs under water immersion, it is necessary to study the impact of train operating speed and steel spring isolator stiffness on vibration reduction under operational conditions. ［Method］Based on fluid-structure interaction theory, a floating slab-immersion-tunnel fluid structure coupled vibration model is developed, incorporating the water-immersed steel spring floating slab and the tunnel. The accuracy of the model is validated using field data. The isolator stiffness and train speed affecting the vibration reduction performance of the water-immersed floating slab under train load action is analyzed. ［Result & Conclusion］Under steel spring floating slab water immersion conditions, changes in isolator stiffness and train operating speed primarily affect the amplitude of tunnel wall vibration, with minimal impact on the distribution of the dominant frequencies. As the stiffness of the steel spring isolators increases or the train operating speed rises, the vibration reduction performance of the floating slab deteriorates more significantly when immersed. When the water depth increases from 80 mm to over 160 mm (the immersion reaches from 1/4 to 1/2 of the slab side space height), the maximum Z-vibration level of the tunnel wall increases by over 10%. When the train operating speed decreases from 80 km/h to 40 km/h under floating slab water immersion conditions, the maximum vibration level of the tunnel wall decreases by approximately 8%, though it remains higher than that under non-immersed conditions. Once the water height exceeds 1/2 of the slab side space height, further reducing isolator stiffness or train operating speed is limited in improving vibration reduction performance. |
| format | Article |
| id | doaj-art-ea67938081a145e3a31d64d398a5f7ec |
| institution | DOAJ |
| issn | 1007-869X |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Urban Mass Transit Magazine Press |
| record_format | Article |
| series | Chengshi guidao jiaotong yanjiu |
| spelling | doaj-art-ea67938081a145e3a31d64d398a5f7ec2025-08-20T02:50:05ZzhoUrban Mass Transit Magazine PressChengshi guidao jiaotong yanjiu1007-869X2024-12-012712879210.16037/j.1007-869x.2024.12.014Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion ConditionsYUAN Dehao0ZHANG Hongliang1YANG Lin2ZHOU Yu3NIU Xiaoli4Qingdao Metro Group Co., Ltd., 266035, Qingdao, ChinaBeijing Urban Construction Design & Development Group Co., Ltd., 100071, Beijing, ChinaQingdao Metro Group Co., Ltd., 266035, Qingdao, ChinaKey Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, 201804, Shanghai, ChinaQingdao Metro Group Co., Ltd., 266035, Qingdao, China［Objective］To address the issues of reduced vibration isolation performance of floating slabs under water immersion, it is necessary to study the impact of train operating speed and steel spring isolator stiffness on vibration reduction under operational conditions. ［Method］Based on fluid-structure interaction theory, a floating slab-immersion-tunnel fluid structure coupled vibration model is developed, incorporating the water-immersed steel spring floating slab and the tunnel. The accuracy of the model is validated using field data. The isolator stiffness and train speed affecting the vibration reduction performance of the water-immersed floating slab under train load action is analyzed. ［Result & Conclusion］Under steel spring floating slab water immersion conditions, changes in isolator stiffness and train operating speed primarily affect the amplitude of tunnel wall vibration, with minimal impact on the distribution of the dominant frequencies. As the stiffness of the steel spring isolators increases or the train operating speed rises, the vibration reduction performance of the floating slab deteriorates more significantly when immersed. When the water depth increases from 80 mm to over 160 mm (the immersion reaches from 1/4 to 1/2 of the slab side space height), the maximum Z-vibration level of the tunnel wall increases by over 10%. When the train operating speed decreases from 80 km/h to 40 km/h under floating slab water immersion conditions, the maximum vibration level of the tunnel wall decreases by approximately 8%, though it remains higher than that under non-immersed conditions. Once the water height exceeds 1/2 of the slab side space height, further reducing isolator stiffness or train operating speed is limited in improving vibration reduction performance.https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.2024.12.014.htmlrail transitfloating slab trackvibration reduction effect |
| spellingShingle | YUAN Dehao ZHANG Hongliang YANG Lin ZHOU Yu NIU Xiaoli Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion Conditions Chengshi guidao jiaotong yanjiu rail transit floating slab track vibration reduction effect |
| title | Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion Conditions |
| title_full | Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion Conditions |
| title_fullStr | Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion Conditions |
| title_full_unstemmed | Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion Conditions |
| title_short | Vibration Reduction Effect of Steel Spring Floating Slabs under Water Immersion Conditions |
| title_sort | vibration reduction effect of steel spring floating slabs under water immersion conditions |
| topic | rail transit floating slab track vibration reduction effect |
| url | https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.2024.12.014.html |
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