Fatigue Behavior of Prestressed Concrete Beam for Straddle-Type Monorail Tracks

Pu, Qianhui; Wang, Hanyu; Gou, Hongye; Bao, Yi; Yan, Meng

doi:10.3390/app8071136

Cited by 21 publications

(11 citation statements)

References 29 publications

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“…In this study, differential cooling, creep, and shrinkage of bulb-tee cross sections are studied as potential reasons of crack growth. Kim and Gou et al [22][23][24][25][26][27][28][29][30] conducted experiments and comparisons between experimental results and design-equation predictions to determine the effects of steel-fiber and rebar reinforcements on the ultimate bearing strength of the local anchorage zone. The test and the comparisons between the design-equation predictions and the test results showed that the ultimate bearing strength and the section efficiency were highly affected by the reinforcement details and the concrete strength.…”

Section: Introductionmentioning

confidence: 99%

Local Stress Behavior of Post-Tensioned Prestressed Anchorage Zones in Continuous Rigid Frame Arch Railway Bridge

Mao

Gou

et al. 2018

Applied Sciences

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The concrete stress behavior and cause of cracking at the anchorage zones of top and bottom slabs of a post-tensioned prestressed concrete box beam were studied. Based on the complex stress distribution under local anchor problem for the Yichang Yangtze River Bridge, which is the longest continuous rigid frame arch railway bridge in the world, model tests were conducted. Two full-scale specimens of top and bottom slabs were fabricated and gradually loaded based on principle of equivalent stress. The goal was to analyze the longitudinal and transverse stress distributions of cross sections of specimens at various loading cases during the experiment. From the experimental results, it can be concluded that the mechanical behavior of the concrete and steel bars were in good agreement when prestressed tendons were loaded. Tensile stress of concrete in prestressed anchorage zone gradually increased and surpassed the ultimate tensile strength of concrete with the increasing load. Consequently, local longitudinal cracking was formed at the anchorage block. Some recommendations to avoid the concrete at the anchorage zone continuing to crack are summarized in this paper.

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Section: Introductionmentioning

confidence: 99%

Local Stress Behavior of Post-Tensioned Prestressed Anchorage Zones in Continuous Rigid Frame Arch Railway Bridge

Mao

Gou

et al. 2018

Applied Sciences

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“…Moreover, the loading frequency of the fatigue test was between 2.4 Hz and 2.8 Hz. During the fatigue loading process, the repeated loading was first periodically paused, and the ballastless track was unloaded to zero when the fatigue cycle was ranged to 0 times (before the test), 500,000 times, 1,000,000 times, and every 500,000 times thereafter until 5,000,000 times [40]. Then the dial gauges were placed, ensuring that the pointers were in contact.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Behaviors and Fatigue Performances of Ballastless Tracks Laid on Long-Span Cable-Stayed Bridges with Different Arrangements

Sheng

Zheng

Zhu

2019

Sensors

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In this paper, we present a new attempt to lay ballastless tracks on long-span cable-stayed bridges on high-speed railways. The arrangements of ballastless tracks laid on cable-stayed bridges can be divided into two conditions: (i) across the cable suspension-point cross-section or (ii) in discontinuity at the cable suspension-point cross-section. At present, there is a lack of in-depth research on ballastless tracks laid on long-span cable-stayed bridges, especially on the mechanical behaviors and fatigue performances of the ballastless tracks with different arrangements. For this paper, a segmental model of a long-span cable-stayed bridge was designed and built, on which full-scale ballastless tracks with two different arrangements were arranged. A series of fatigue tests and post-fatigue loading tests were carried out based on the two selected full-scale ballastless tracks. Some conclusions were drawn as follows. For the longitudinal end of the ballastless track, which is far from the loading positions, the interlayers of the ballastless tracks tend to warp up relatively, and the compressive pressures at the interlayers are also unloaded. However, there is no void or gap formed at the interlayers of the longitudinal end of the track slab due to the precompression of the rubber isolation layer. For the center of the track slab, which is close to the loading positions, the compressive deformations occur at the interlayers, and the pressures at interlayers are also increased. The maximum compressive deformation is less than 0.5 mm under the standard train axle load (170 kN), and it cannot affect the high-speed trains’ operation. With the increase of the post-fatigue loading, the load-displacement curves and the load-pressure variation curves of the ballastless tracks show apparent nonlinearity. Moreover, with the increase of the fatigue loading cycles, the compressive stiffness enhancement or degradation of the ballastless tracks are not noticeable. That is to say, the ballastless tracks laid on the long-span cable-stayed bridges with different arrangements have good mechanical behaviors, and their fatigue performances can also be guaranteed after bearing repeated loadings.

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“…Pu, QH et al have studied the fatigue performance of PC beams in straddle monorail system, carried out stiffness degradation and strain change tests, tested the displacement and rotation of concrete beams and steel bars, and established a three-dimensional finite element model [14]. Gou et al have studied the dynamic characteristics of bridges under load by finite element method, and then, based on the simulation results, the influencing factors of bridges and evaluated the ride comfort of trains has been studied [15].…”

Section: Introductionmentioning

confidence: 99%

Research on Vehicle-Bridge Vertical Coupling Dynamics of Monorail based on Multiple Road Excitations

Yang

et al. 2020

mech

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In order to study the vertical dynamic behavior of the monorail-bridge system, the vehicle-bridge coupling dynamic equation and train simulation model are established based on the principle of dynamics; the train simulation model is established based on the multi-body dynamics; the track model is established based on the finite element theory, and the compression deformation of PC beam and the effect of finger band on train are equivalent to load spectrum on train axle by means of dynamic equivalence principle, and finally, the train-track interaction model is established; the vertical vibration of the train before and after adding the influence of the compressive deformation of the track beam is simulated and calculated respectively, the results show that the influence of the compressive deformation of the track beam on the vertical vibration of the train is significant, and the simulation data under multiple road excitations are very close to the real value.

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Fatigue Behavior of Prestressed Concrete Beam for Straddle-Type Monorail Tracks

Cited by 21 publications

References 29 publications

Local Stress Behavior of Post-Tensioned Prestressed Anchorage Zones in Continuous Rigid Frame Arch Railway Bridge

Local Stress Behavior of Post-Tensioned Prestressed Anchorage Zones in Continuous Rigid Frame Arch Railway Bridge

Mechanical Behaviors and Fatigue Performances of Ballastless Tracks Laid on Long-Span Cable-Stayed Bridges with Different Arrangements

Research on Vehicle-Bridge Vertical Coupling Dynamics of Monorail based on Multiple Road Excitations

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