Simplified seismic model of CRTS II ballastless track structure on high-speed railway bridges in China

Guo, Wei; Hu, Yao; Gou, Hongye; Du, Qiaodan; Fang, Wei; Jiang, Lizhong; Yu, Zhiwu

doi:10.1016/j.engstruct.2020.110453

Cited by 47 publications

(17 citation statements)

References 29 publications

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“…At 19:00, the ambient temperature is high, and the vertical relative displacement values for the track slab and CA mortar layer at sections 0 L, 1 4 L and 3 4 L indicate that the two structural layers are far from each other, and 1 2 L and L are close to each other; on the contrary, the ambient temperature is low at 7:00 the next day, and the vertical relative displacement values for the track slab and CA mortar layer at sections 0 L and 1 4 L indicate that the two structural layers are close to each other, and 1 2 L and L are away from each other. For the symmetrical position of the middle section of the test beam, the vertical relative displacement values between the track slab and the CA mortar layer near the shear slot are greater than those of the other side; that is, the relative displacement values of sections 0 L and 1 4 L are greater than those of sections L and 3 4 L.…”

Section: Vertical Relative Displacement Between Layersmentioning

confidence: 93%

“…With its advantages, such as high smoothness, high stability and good durability, the CRTS-II ballastless slab track has been widely used in China [1][2][3]. However, under the joint action of construction, the natural environment, external loading, self-aging, and other factors, the CRTS-II ballastless track system will experience a series of issues, such as interlayer separation [4], longitudinal irregularities [5], and track slab warping [6].…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Investigation of the Temperature-Dependent Mechanical Properties of a CRTS-Ⅱ Ballastless Track-Bridge Structural System in Summer

et al. 2020

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To study the mechanical properties of the China Railway Track System type II (CRTS-II) ballastless slab track structure, a 1/4-scale specimen of a CRTS-II slab ballastless track-32-m standard prefabricated simply supported box girder bridge with three spans and two high-speed railway lines was developed. The mechanical properties of the structure under the action of daily natural temperatures were studied under the natural environmental conditions. The structural strain and relative interlayer displacements were analyzed. The results show that the temperature of the CRTS-II ballastless track-bridge structural system changes periodically every 24 h. The strain of the structural layers of the track system first increases and then decreases sinusoidally, and the internal strain of the track system lags along the vertical depth direction. The relative displacement between the layers of the ballastless track bridge structure system increases with the increase in temperature. The extreme value of the vertical relative displacement appears between the track bed and the bridge at section 1/4 in the span, so it should be paid attention to by the maintenance personnel. Due to the constraint of the shear slots, the structural strain and relative displacement at the fixed end near the shear slots are smaller than those at the sliding end. The mid-span deflection is the largest, and the overall deflection during the cooling phase is more significant than that during the heating phase.

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Section: Vertical Relative Displacement Between Layersmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation of the Temperature-Dependent Mechanical Properties of a CRTS-Ⅱ Ballastless Track-Bridge Structural System in Summer

et al. 2020

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“…To reduce land coverage, the rule of "substituting a bridge for subgrade" is often adopted in the design and construction of high-speed railways. Bridges account for up to 70%-80% of the entire rail line in terms of length, and most are short-span bridges [1][2][3][4][5][6]. erefore, selecting the optimal earthquake resisting scheme for short-span bridges is crucial to maximizing the safety, serviceability, and economy of high-speed railways in high seismic intensity regions.…”

Section: Introductionmentioning

confidence: 99%

Optimal Selection of Earthquake Resisting Schemes for Jakarta‐Bandung High‐Speed Railway

Quan

Lin

Liu

et al. 2022

Advances in Civil Engineering

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The Jakarta-Bandung high-speed railway is the first overseas project involving China’s high-speed railway. Owing to the high seismic intensity in this area, the optimal selection of earthquake resisting schemes is critical for short-span bridges, and such schemes are related to the safety and cost-effectiveness of the entire line. This study compares the safety and cost-effectiveness of four earthquake resisting schemes: (i) prestressed concrete (PC) simply-supported box beams using common spherical steel bearings; (ii) PC simply-supported box beams using seismic isolation bearings; (iii) steel-concrete (SC) composite simply-supported beams using seismic isolation bearings; (iv) reinforced concrete (RC) rigid frames. The results indicate that PC beams using more expensive seismic isolation bearings reduce the cost of the substructure, making it more cost-effective. In contrast, the scheme of SC composite beams is the most expensive one, and the associated maintenance costs are also the highest. Although the scheme of RC rigid frames is the cheapest among the evaluated schemes, it is only suitable for relatively stiff sites with low pier heights. Overall, PC beams with isolation bearings exhibit good seismic performance and are suitable for prefabricated construction; therefore, this scheme can be applied in various soil conditions with relatively low costs, and it is recommended for use throughout the entire Jakarta-Bandung high-speed railway.

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“…In Jiang's study [8] , a scaled experimental 2-span model without considering subgrade was tested on shake table for each bridge to validate the rationality of all models and the appropriate strength of FPB shear pin was achieved. However, it should be mentioned that this assumption may lead to unreasonable responses in seismic analysis, due to the coupling effect between adjacent spans caused by the track constraints, which is neglected [9,10] .…”

Section: Introductionmentioning

confidence: 99%

Control of Difference of Seismic Response Across Different Spans of High-Speed Railway Multi-Spans Simply Supported Bridge

Zhang

Jiang

Zhou

et al. 2021

Preprint

Self Cite

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In this paper, the Difference of Seismic Response across Different Spans (DSR) in the longitudinal distribution of High-Speed Railway Multi-spans Simply Supported Bridge (HSRSB) under longitudinal earthquake excitation is investigated, and an evaluation method which can intuitively reflect the difference of seismic response is proposed. A feasible way to strengthen the connection stiffness between adjacent girders is proposed to control DSR. The rationality of the finite element model used is verified by comparing the numerical results with the experimental ones, showing a satisfactory agreement. Comparing the seismic response of a bridge model considering the subgrade-track constraints (BCTM) and a bridge model without subgrade-track constraints (BWTM), it is found that the DSR in the longitudinal distribution causes some new disadvantages, which are neglected in BWTM. The BCTM considering DLC generates a model called BCDM. The effect of the number of span on DSR are studied based on BCDM. The analysis of this model showed that DLC suppresses the DSR and reduces the seismic response of most bridge components. It also transfers the seismic disadvantage from the bridge part to the subgrade-track structure. As it is more convenient and cost-effective to repair the base plate of the subgrade than the bridge components after earthquake seismic event, this disadvantage transfer is in favor of forming a new anti-seismic system that subgrade-track structure is used to protect the bridge part.

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Simplified seismic model of CRTS II ballastless track structure on high-speed railway bridges in China

Cited by 47 publications

References 29 publications

Laboratory Investigation of the Temperature-Dependent Mechanical Properties of a CRTS-Ⅱ Ballastless Track-Bridge Structural System in Summer

Laboratory Investigation of the Temperature-Dependent Mechanical Properties of a CRTS-Ⅱ Ballastless Track-Bridge Structural System in Summer

Optimal Selection of Earthquake Resisting Schemes for Jakarta‐Bandung High‐Speed Railway

Control of Difference of Seismic Response Across Different Spans of High-Speed Railway Multi-Spans Simply Supported Bridge

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