Impact performance of a floating slab with a longitudinal connection track under fatigue loading

Abstract

In order to accommodate higher speeds, heavier axle weights, and vibration damping criteria, a new floating slab structure was proposed. The new type of floating slab track structure was composed of three prefabricated floating slabs longitudinally interconnected with magnesium ammonium phosphate concrete (MPC). This study investigated the dynamic performance of the structure. We constructd a full-scale indoor experimental model to scrutinize the disparities in the impact performance between a longitudinally connected floating slab track and its longitudinally disconnected counterpart. Additionally, a long-term fatigue experiment was conducted to assess the impact performance of longitudinally connected floating slab tracks under fatigue loading. The findings are described in the following. 1) The new structure effectively suppresses ground vibrations, exhibiting a well-balanced energy distribution profile. However, the imposition of fatigue loading leads to a reduction in the damping performance of the steel spring damping system, thereby reducing its capacity to attenuate structural vibrations and leading to an increase in ground vibration energy; 2) After 10⁷ loading cycles, the attenuation rate of the vibration acceleration for the MPC increases by 171.9%. Conversely, at the corresponding disconnected location, the attenuation rate of ground vibration acceleration decreases by 65.6%. In conclusion, longitudinally connected floating slab tracks exhibit superior vibration reduction performance. While the vibration reduction performance of longitudinally connected floating slab tracks may diminish to some extent during long-term service, these tracks continue to meet specific vibration reduction requirements.

References

[1] GD, LS. Free field vibrations during the passage of a thalys high-speed train at variable speed [J]. Journal of Sound and Vibration, 2001, 247(1): 131-144

[2] WrótnyM, BohatkiewiczJ. Traffic noise and inhabitant health: A comparison of road and rail noise [J]. Sustainability, 2021, 13(13): 7340

[3] MingX-h, ZhengJ-y, WangL-c, et al.. A case study of excessive vibrations inside buildings due to an underground railway: Experimental tests and theoretical analysis [J]. Journal of Central South University, 2022, 29(1): 313-330

[4] MaM, LiuW-n, SunN, et al.. Reasons and laws of ground vibration amplification induced by vertical dynamic load [J]. Journal of Central South University, 2014, 21(4): 1660-1671

[5] DingD-y, LiuW-n, GuptaS, et al.. Prediction of vibrations from underground trains on Beijing metro line 15 [J]. Journal of Central South University of Technology, 2010, 17(5): 1109-1118

[6] LiuT-h, RaoR, LiuJ-w, et al.. Experimental study on the damping effects of various vibration reduction measures [J]. IOP Conference Series: Materials Science and Engineering, 2020, 735(1): 012067

[7] SaurenmanH, PhillipsJ. In-service tests of the effectiveness of vibration control measures on the BART rail transit system [J]. Journal of Sound and Vibration, 2006, 293(3–5): 888-900

[8] NelsonJ T. Recent developments in ground-borne noise and vibration control [J]. Journal of Sound and Vibration, 1996, 193(1): 367-376

[9] SharmaS K, KumarA. Ride performance of a high speed rail vehicle using controlled semi active suspension system [J]. Smart Materials and Structures, 2017, 26(5): 055026

[10] LeiX-y, JiangC-da. Analysis of vibration reduction effect of steel spring floating slab track with finite elements [J]. Journal of Vibration and Control, 2016, 22(6): 1462-1471

[11] HuangX-d, ZengZ-p, LiZ, et al.. Experimental study on vibration characteristics of the floating slab with under-slab polyurethane mats considering fatigue loading effect [J]. Engineering Structures, 2023, 276: 115322

[12] ZengZ-p, AhmedS A, LiuF-s, et al.. Experimental study on the vibration reduction characteristics of the ballasted track with rubber composite sleepers [J]. Construction and Building Materials, 2020, 262: 120766

[13] GuoY-x, LiuW-l, XiongL, et al.. Fiber Bragg grating displacement sensor with high abrasion resistance for a steel spring floating slab damping track [J]. Sensors, 2018, 18(6): 1899

[14] KhajehdezfulyA, PoorveisD, MohammadA A. Effect of track flexibility on fatigue life of railway concrete slab track [J]. Construction and Building Materials, 2023, 382: 131341

[15] LiH-l, XuG, GuiX, et al.. An FBG displacement sensor in deformation monitoring of subway floating slab [J]. IEEE Sensors Journal, 2021, 21(3): 2963-2971

[16] WeiK, ZhaoZ-m, DuX-g, et al.. A theoretical study on the train-induced vibrations of a semi-active magneto-rheological steel-spring floating slab track [J]. Construction and Building Materials, 2019, 204: 703-715

[17] LingL, JiangP-b, WangK-y, et al.. Dynamic interaction between rail vehicles and vibration-attenuating slab tracks [J]. Construction and Building Materials, 2020, 258: 119545

[18] YangX-r, HuangM-q, LinFang. Research strategies on new prefabricated technology for underground metro stations [J]. Urban Rail Transit, 2019, 5(3): 145-154

[19] LiX-j, WangC, AlashwalA, et al.. Game analysis on prefabricated building evolution based on dynamic revenue risks in China [J]. Journal of Cleaner Production, 2020, 267: 121730

[20] BashirS, MandhaniyaP, AkhtarN. Influence of plasticity and vibration isolators on an underground floating slab track using finite element analysis [J]. Structures, 2023, 55: 1783-1792

[21] AlabbasiS, HusseinM, AbdeljaberO, et al.. A numerical and experimental investigation of a special type of floating-slab tracks [J]. Engineering Structures, 2020, 215: 110734

[22] SharmaS K, KumarA. Ride comfort of a higher speed rail vehicle using a magnetorheological suspension system [J]. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics, 2018, 232(1): 32-48

[23] JinH, LiZheng. Band gap analysis of improved point-supporting structure for floating-slab track through theoretical model [J]. Journal of Vibration Engineering & Technologies, 2022, 10(1): 55-69

[24] ZengZ-p, HuangX-d, LiZ, et al.. Experimental research on vibration-damping effect of combined shear hinge prefabricated steel spring floating slab track [J]. Sensors, 2022, 22(7): 2567

[25] XuG-hui. Dynamic parameter optimization and experimental study of tuned slab damper on metro systems [J]. Shock and Vibration, 2019, 2019(1): 1236827

[26] ZhaoC-y, ShiD-j, ZhengJ-y, et al.. New floating slab track isolator for vibration reduction using particle damping vibration absorption and bandgap vibration resistance [J]. Construction and Building Materials, 2022, 336: 127561

[27] LiQ-y, GaoZ-y, YangR-s, et al.. Study on assembled floating slab track of 160 km/h municipal railway [J]. Journal of Railway Science and Engineering, 2022, 19(10): 2893-2902

[28] ZhangS-h, LiQ-y, YuanQ, et al.. Effect of roughness on bonding performance between Portland cement concrete and magnesium phosphate cement concrete [J]. Construction and Building Materials, 2022, 323: 126585

[29] TB/T 3395.5-2015. Railway industry standards of the People’s Republic of China [S]. (in Chinese)

[30] TB 10082-2017. Code for design of railway track [S]. (in Chinese)

[31] ZengZ-p, HuangX-d, YanB, et al.. Research on the fatigue performance of self-compacting concrete structure in CRTSIII slab ballastless track under the action of heavy haul train [J]. Construction and Building Materials, 2021, 303: 124465

[32] TarifaM, ZhangX-x, RuizG, et al.. Full-scale fatigue tests of precast reinforced concrete slabs for railway tracks [J]. Engineering Structures, 2015, 100: 610-621

[33] CJJ/T-191-2012. Technical code for floating slab track [S]. (in Chinese)

[34] YuanYangStudy on artificial single-point pulse excitations method for prediction of metro train-induced environmental vibration [D], 2014, Beijing, China, Beijing Jiaotong University(in Chinese)

[35] International Standard ISO 2631-1: 1997 (E). Mechanical Vibration and Shock: Evaluation of Human Exposure to Whole-body Vibration. Part 1, General Requirements [S].

[36] ZengZ-p, WangJ-d, YinH-t, et al.. Experimental investigation on the vibration reduction characteristics of an optimized heavy-haul railway low-vibration track [J]. Shock and Vibration, 2019, 2019(1): 1539564

RIGHTS & PERMISSIONS

Central South University