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近断层脉冲型地震作用下高速铁路桥梁-轨道系统响应分析
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Response Analysis of High-speed Railway Bridge-rail System Subjected to Near-fault Pulse-type Earthquake
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    为了研究在近断层脉冲型地震作用下高速铁路桥梁-轨道系统的动力响应规律,针对高速铁路线上最常用的简支梁形式结构,以某8 × 32.7 m高速铁路简支箱梁桥为例. 建立了考虑简支梁与CRTS I型板式无砟轨道之间相互作用的桥梁-轨道模型,讨论了具有破裂前方脉冲、滑冲脉冲、无脉冲型近断层地震动对桥梁-轨道系统的影响及扣件阻力改变时桥梁-轨道系统动力响应的变化. 结果表明:三种脉冲类型地震动作用下钢轨的受力和变形规律保持一致,脉冲型地震动较无脉冲型地震动增加了约20%钢轨应力和位移. 相对于轨道系统,桥墩对脉冲类型更为敏感,在破裂前方脉冲和滑冲脉冲地震作用下,桥墩的墩顶最大位移比无脉冲地震动分别增大了106.6%和148.6%,墩底弯矩和剪力也有明显增大,在进行高速铁路桥梁抗震设计时应考虑脉冲类型对桥梁结构的影响. 扣件纵向阻力从5 kN/组增大到15 kN/组时,墩顶最大位移降低了10%,但钢轨应力和位移峰值约为原来的2倍.

    Abstract:

    To study the dynamic response law of high-speed railway bridge-rail system subjected to the action of near-fault impulse earthquake, an 8×32.7 m high-speed railway simply supported box girder bridge is taken as an example for the simple-supported beam form structure most commonly used on high-speed railway line. A bridge-rail model considering the interaction between simply supported beams and CRTS I type slab ballastless track is established. The effects of near-fault ground pulses with rupture front pulses,sliding pulses,and pulse-free near-fault on the bridge-rail system are discussed,as well as the changes of bridge-rail system dynamic response when fastener resistance changes. The results show that the stress and deformation rules of the track under the action of the three pulse types of ground motion are consistent. The pulse-type ground motion increases the track stress and displacement by about 20% when compared with the pulse-free ground motion. Compared with the track system,the pier is more sensitive to the type of pulse. Under the action of pulse and slip pulse before the rupture,the maximum displacement of the pier top is increased by 106.6% and 148.6%,respectively,when compared with the non-pulse ground motion. The bending moment of the pier bottom and the shear force are also increased significantly,and the impact of the pulse type on the bridge structure should be considered in the seismic design of high-speed railway bridges. When the longitudinal resistance of the fastener is increased from 5 kN/group to 15 kN/group,the maximum displacement of the pier top is reduced by 10%,but the peak stress and displacement of the track are about twice the original values.

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喻梅,吕佳伟,贾宏宇?覮,贾康,郑史雄,赵灿晖.近断层脉冲型地震作用下高速铁路桥梁-轨道系统响应分析[J].湖南大学学报:自然科学版,2021,(9):147~154

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  • 在线发布日期: 2021-09-28
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