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Sensitive factors research for track-bridge interaction of Long-span X-style steel-box arch bridge on high-speed railway

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Journal of Central South University 2013年第11期20卷 3314-3323页

作者：刘文硕戴公连何旭辉 School of Civil Engineering Central South University

X-style arch bridge on high-speed railways(HSR)is one kind of complicated long-span structure,and the track-bridge interaction is essential to ensure the safety and smoothness of *** an X-style steel-box arch bridge with a main span of450 m on HSR under construction for example,a new integrative mechanic model of rail-stringer-cross beam-suspenderpier-foundation coupling system was established,adopting the nonlinear spring element simulating the longitudinal resistance between track and *** transmission law of continuous welded rail(CWR)on the X-style arch bridge was researched,and comparative study was carried out to discuss the influence of several sensitive factors,such as the temperature load case,the longitudinal resistance model,the scheme of longitudinal restraint conditions,the introverted inclination of arch rib,the stiffness of pier and abutment and the location of the rail expansion *** results indicate that the longitudinal resistance has a significant impact upon the longitudinal forces of CWR on this kind of bridge,while the arch rib’s inclination has little ***,temperature variation of arch ribs and suspenders should be taken into account in the *** the restraint system without longitudinally-fixed bearing and setting the rail expansion devices on both ends are more reasonable.

关键词： high-speed railway track-bridge interaction X-style steel-box arch bridge continuous welded rail

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Influence of the Randomness of Longitudinal Resistance of Ballast Bed on track-bridge interaction

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Engineering（科研） 2023年第11期15卷 729-741页

作者： Weiwu Dai Yunfei Zhang Bowen Liu Kaize Xie School of Safety Engineering and Emergency Management Shijiazhuang Tiedao University Shijiazhuang China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang China

To get the influence of the randomness of longitudinal resistance of ballast bed (LRBB) on track-bridge interaction, the statistical law of LRBB was studied with existing test data and the Shapiro-Wilk test. Based on the principle of track-bridge interaction, a rail-sleeper-bridge-pier integrated simulation model that could consider the randomness of LRBB was established. Taking a continuous beam bridge for the heavy-haul railway as an example, the effect of the randomness of LRBB on the mechanical behavior of continuous welded rail (CWR) on bridges under typical conditions was carefully examined with a random sampling method and the simulation model. The results show that the LRBB corresponding sleeper displacement of 2 mm obeys a normal distribution. When the randomness of LRBB is considered, the amplitudes of rail expansion force, rail bending force, rail braking force and rail broken gap all follow normal distribution. As the standard deviations of the four indexes are small, which indicates the randomness of LRBB has little effect on track-bridge interaction. The distributions of the four indexes make it possible to design CWR on bridges with the limit state method.

关键词： Continuous Welded Rail track-bridge interaction Longitudinal Resistance of Ballast Bed Normal Distribution

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Longitudinal force in continuously welded rail on long-span tied arch continuous bridge carrying multiple tracks

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Journal of Central South University 2015年第5期22卷 2001-2006页

作者：闫斌戴公连郭文华徐庆元 School of Civil Engineering Central South University National Engineering Laboratory for High Speed Railway Construction (Central South University)

Considering arch rib, lateral brace, suspender, girder, pier and track position, the model for the interaction between long-span tied arch continuous bridge and multiple tracks was established by using steel-concrete composite section beam element to simulate concrete-filled steel tube(CFST) arch rib, using the beam element with rigid arm to simulate the prestressed concrete girder and using nonlinear bar element to simulate longitudinal constraint between track and bridge. Taking a(77+3×156.8+77) m tied arch continuous bridge with four tracks on the Harbin-Qiqihar Passenger Dedicated Line as an example, the arrangement of continuously welded rail(CWR) was explored. The longitudinal force in CWR on the tied arch continuous bridge, the pier top horizontal force and torque due to the unbalance load case, were analyzed under the action of temperature, vertical live load, train braking and wind *** show that, it can significantly reduce track displacement to set the track expansion devices at main span arch springing on both sides; the track stress due to arch temperature variation can reach 40.8 MPa; the track stress, pier top horizontal force and torque are related to the number of loaded tracks and train running direction, and the bending force applied to unloaded track is close to the loaded track, while the braking force applied to unloaded track is 1/4 to 1/2 of the loaded track; the longitudinal force of track due to the wind load is up to 12.4 MPa, which should be considered.

关键词： railroad bridge long-span bridge tied arch continuous beam continuously welded rail track-bridge interaction

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