双层车辆荷载作用下地下空间半悬挂车道动力响应仿真分析
章新生
Dynamics Response Simulation Analysis of Underground Space Semi-suspended Lanes under Double-decker Vehicle Loads
ZHANG Xinsheng
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作者信息:中铁四局集团第五工程有限公司，332005，九江
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Affiliation:The Fifth Engineering Co., Ltd., CREC No.4 Group, 332005, Jiujiang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.08.034
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中图分类号/CLCN:TU93+2∶U231
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栏目/Col:研究报告
摘要:
［目的］新型地下综合体预应力吊墙半悬挂式行车道结构具有美观、净空大的优点，但对该新型结构的力学性能的研究尚处于起始阶段，需要对该半悬挂式车道板结构的动力特性进行深入研究。［方法］以深圳市黄木岗地下综合交通枢纽某区间半悬挂式车道板隧道为背景，采用Midas/GTS软件建立地下综合体半悬挂车道板三维有限元模型，研究了双层车辆荷载作用下半悬挂车道板的位移、加速度、应力的动态响应规律。［结果及结论］车辆动荷载作用下，车道板中部位移及加速度响应最大，沿车道板中部至侧墙连接处位移与加速度响应逐渐减弱，车道板位移响应峰值约为吊墙、顶板与侧墙的4.6～12.3倍，吊墙、顶板与侧墙的加速度响应峰值约为车道板中部的4.0％～21.6％；动荷载作用下，车道板中部以及与侧墙的连接部位应力响应明显，在车道板与侧墙的连接处出现了应力集中现象，并表现为轻微的不对称变形特征；上层车辆荷载对吊墙的位移与加速度响应幅值影响相对较大，增长幅度明显高于其他区域。
Abstracts:
［Objective］ The new prestressed hanging wall semi-suspended lane structure in underground complex offers advantages of aesthetic appearance and large clearance. However, the research on the mechanical properties of the new structure is still in the initial stage, necessitating an in-depth study on the mechanical characteristics of this semi-suspended lane structure. ［Method］ Based on an interval of the semi-suspended lane slab tunnel in Shenzhen Huangmugang Underground Comprehensive Transportation Hub, a 3D finite element model of the underground complex semi-suspended lane slab is established using Midas/GTS software. The dynamics response laws of displacement, acceleration, and stress under the influence of double-decker vehicle loads are analyzed. ［Result & Conclusion］ The results indicate that under vehicle dynamic loads, the displacement and acceleration response are the highest at lane slab center and gradually decrease towards the side wall connections. The peak displacement response of the lane slab is approximately 4.6 to 12.3 times greater than that of the hanging wall, roof slab and side wall, while the peak acceleration response of the above three places is about 4.0% to 21.6% of that of the lane slab center. Under dynamic loads, significant stress response occurs at the lane slab center and its connection to side wall, with a stress concentration observed at these connection points, showing slight asymmetrical deformation characteristics. The displacement and acceleration response amplitude of the hanging wall are notably affected by the top-decker vehicle loads, with increasing amplitudes significantly higher than in other areas.
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