动载下CRTSII型无砟轨道-简支梁桥变形试验研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (7) : 102-108.

论文

戴公连1,2，王蒙1，刘文硕1,2

作者信息 +

Tests for deformation of a simply supported beam bridge with CRTS II ballastless track subjected to dynamic loads

DAI Gonglian1,2WANG Meng1 LIU Wenshuo1,2

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摘要

为了研究动载下CRTSⅡ型无砟轨道简支梁桥的变形特征，以现场试验为依托，测试了CRH380A-001型列车以速度240~350km/h通过纵连板式无砟轨道32m简支梁桥时梁轨系统的结构变形。通过现场采集和数据分析，得到了桥梁结构的竖横向绝对位移、水平折角及梁端转角，轨道结构的竖横向相对位移和墩梁纵横向相对位移，研究了桥梁的共振速度及动力系数。结果表明：动载下梁体竖向跨挠比最小值为54000，水平跨挠比最小值为150000，远大于规范规定最小限值；梁体梁端转角最大值为0.077‰，水平折角最大值为0.119‰，满足规范限值；实测CRTSⅡ型无砟轨道32m简支梁桥存在二阶竖向共振速度306km/h及三阶横向共振速度312km/h，分别与理论共振速度309km/h和315km/h相吻合；在共振速度附近实测动力系数大于规范规定取值1.084，且最大值达1.18。

Abstract

In order to obtain deformation characteristics of a simply supported beam bridge with CRTS II ballastless track under dynamic loads, based on field tests, structural deformations of the track-bridge system were measured during CRH380A-001 train passing through a 32m long simply supported beam bridge with longitudinal continuous plate type ballastless track at the speed of 240 to 350 km/h. Through signals collecting on site and data analysis, vertical and transverse absolute displacements, horizontal break angle and beam-end rotary angle of the beam bridge structure, vertical and transverse relative displacements of the track structure and relative displacements of the pier beam were obtained. The resonance speed and dynamic coefficient of the bridge were studied. The results showed that under dynamic loads, the minimum vertical ratio of span to deflection of the beam is 54000, the minimum horizontal one is 150000, they are far larger than the minimum limit values in the code; the maximum values of the rotary angle at the beam-end and the beam horizontal break angle are 0.077‰ and 0.119‰, respectively, they are smaller than the limit values in the code; furthermore, the simply supported beam bridge with CRTS II ballastless track has the second-order vertical resonance velocity of 306km/h and the third-order transverse resonance velocity of 312km/h obtained with actual measurements, they agree well with the theoretical resonance velocities of 309km/h and 315km/h, respectively; the dynamic coefficient actually measured near the resonance velocity is bigger than the limit value of 1.084 in the code, its maximum value reaches 1.18.

导出引用

戴公连1,2，王蒙1，刘文硕1,2. 动载下CRTSII型无砟轨道-简支梁桥变形试验研究[J]. 振动与冲击, 2018, 37(7): 102-108

DAI Gonglian1,2WANG Meng1 LIU Wenshuo1,2. Tests for deformation of a simply supported beam bridge with CRTS II ballastless track subjected to dynamic loads[J]. Journal of Vibration and Shock, 2018, 37(7): 102-108

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