为了研究振动标线设置对长大坡桥梁结构挠度冲击系数的影响，以30m连续箱梁桥和五轴车辆为研究对象，基于实际振动标线结构形式进行不平顺度模拟，建立车桥耦合振动方程。借助ANSYS及APDL语言，采用直接积分法进行求解，得到了不同跨中位置挠度时程曲线和冲击系数，研究了振动标线数量、组间距和位置对连续梁桥不同跨中截面挠度冲击系数的影响。结果表明，设置振动标线后连续梁桥挠度冲击系数均大于规范值，且最大值为规范值的2.40倍；振动标线组数增加对下坡方向第一跨跨中位置挠度冲击系数影响不大，但对第二跨跨中挠度冲击系数有较大影响；随着振动标线组组间距增大，不同跨中截面挠度冲击系数变化规律不同；振动标线设置位置对不同跨中截面挠度冲击系数有一定影响；当振动标线组数为6时，首条振动标线宜选择距梁端距离4m位置，振动标线组间距宜为4.5m，当振动标线组数为4或5时，需根据不同跨径布置选择相应的振动标线设置形式。研究结论可为桥梁结构中振动标线的设置提供参考。
Abstract
In order to study the influence of vibration marking on the deflection dynamic load allowance(DLA) of long slope bridge structure, taking 30m span continuous box girder bridge and five-axis vehicle as the research object, the irregularity based on the actual vibration marking form was simulated, and the vehicle bridge coupling vibration equation is established. With the help of ANSYS and APDL language, the direct integration method is used to solve the equation, and the deflection time history curves and the DLA of different midspan positions are obtained. The influence of the number, spacing and position of vibration markings on the deflection DLA of different midspan sections of continuous girder bridge is studied. The results show that the deflection DLA of continuous girder bridge with vibration marking is greater than that in the code value, and the maximum value of the former is 2.40 times than the latter; the number of vibration markings has little influence on the deflection DLA of the first mid-span in the travelling direction, but it has a great influence on the deflection DLA of the second mid-span; with the increase of the spacing of vibration markings, the deflection DLA of different midspan positions changes differently; the position of vibration markings has effect on the deflection DLA of different midspan positions. When the number of vibration markings groups is 6, the distance from the first vibration marking to the bridge end is suggested to be 4m, and the spacing is 4.5m. When the number of vibration markings groups is 4 or 5, the vibration marking setting should be selected according to different span layout. The research results can provide reference for the setting of vibration markings on bridge structures.
关键词
桥梁工程 /
连续梁桥 /
振动标线 /
冲击系数 /
车-桥耦合 /
时程曲线
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Key words
bridge engineering /
continuous girder bridge /
vibration marking /
dynamic load allowance /
vehicle-bridge coupled /
time-history curve
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