Study on structural safety of D-type temporary beam under vehicle-bridge coupling

doi:10.16265/j.cnki.issn1003-3033.2022.S1.0328

Abstract

Abstract:

In order to ensure construction safety and driving safety, taking a municipal tunnel passing through a busy railway project with 13 tracks as an example, a safety monitoring system was established to obtain measured data, and then a vehicle-bridge coupling dynamics model was constructed. The safety of the beam and train under the various working conditions were studied through the measured data and simulated data. The results show that the vehicle-bridge coupling model has certain reliability, and the track irregularity has a great impact on the safety of the beam and the train. The wheel load reduction rate increases with the increase of the vehicle speed. The web stress increases, the stability of the beam decreases, and the load reduction rate of the wheel increases when the train passes through the curve. The influence of the additional deformation of temperature on the structure safety is small, but the temperature stress cannot be ignored. During the construction period, the track smoothness is measured, and the D-type beam is passed at an appropriate speed to ensure driving safety. The inclined rods and limit devices are arranged to ensure structural stability.

Key words: vehicle-bridge coupling, D-type temporary beam, structure safety, safety monitoring, driving safety

CAO Zhen, LIN Wenxu, WAN Siyu, LIU Zhao, ZHANG Chaochao, LEI Bin. Study on structural safety of D-type temporary beam under vehicle-bridge coupling[J]. China Safety Science Journal, 2022, 32(S1): 96-102.

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工况	温度			线形		车速		轨道不平顺
工况	降温40 ℃	常温	升温40 ℃	直线	曲线	30 km/h	45 km/h	5级谱	5级谱+附加变形
1	—	√	—	√	—	√	—	√	—
2	—	√	—	√	—	—	√	√	—
3	—	√	—	—	√	—	√	√	—
4	√	—	—	√	—	—	√	—	√
5	—	—	√	√	—	—	√	—	√

监测点位	挠度/mm
监测点位	30 km/h	45 km/h
第1跨跨中挠度(北)	15.8	14.7
第1跨跨中挠度(南)	15.8	14.6
第2跨跨中挠度(北)	14.9	13.4
第2跨跨中挠度(南)	14.4	12.5

监测点位	30 km/h 直线	30 km/h 曲线	45 km/h 直线	45 km/h 曲线
上翼缘第1跨	61.74	72.47	55.68	69.77
上翼缘第2跨	59.76	71.64	56.77	68.95
下翼缘第1跨	39.58	43.52	32.92	36.70
下翼缘第2跨	37.26	41.85	31.82	35.89