摘要
大轴重运输条件下,重载铁路小跨度梁病害损伤频繁出现,致使其承载能力和使用性能逐渐降低,安全与稳定问题日益凸显。为研究常见类型小跨度板梁在大轴重运输条件下的静动力特性,以某重载铁路12.0 m跨度低高度整体式预应力板梁(简称整体梁)和并置式普通钢筋混凝土板梁(简称并置梁)为对象,基于现场试验和数值模拟方法,开展静力性能试验、动力性能试验、承载能力分析和提速、提轴条件下动力适应性分析,探索小跨度低高度板梁在大轴重运输条件下的差异性和适用性。研究结果表明:设计静活载作用下,小跨度并置梁和整体梁均处于弹性工作状态,2种类型板梁荷载-挠度、荷载-应变等关系曲线均呈线性变化,且应变和挠度实测数据均小于理论计算值;相同静力荷载作用下,实测整体梁跨中挠度、应变等关键参数均小于并置梁,整体梁具有更大的刚度和承载能力。正常运营列车和提速、提高轴重列车作用下,整体梁横向和竖向频率分别为27.26 Hz和11.21 Hz,其自振频率较并置梁有大幅提高;同时,相同动力荷载作用下,整体梁跨中横向振幅、横向加速度、竖向振幅、竖向加速度和动力系数较并置梁均有明显降低,整体梁具有更大的横向刚度和整体稳定性,满足35.0 t轴重及80 km/h的列车通行。
Under the condition of large axle load transportation,the damage of small-span beams of heavy haul railways frequently occurs,resulting in the decrease of its bearing capacity and service performance.The safety and stability problems are becoming increasingly prominent.In order to study the static and dynamic performance of common types of small-span slab beams under heavy axle load transportation conditions,the 12.0 m-span low-height integral prestressed slab beam(referred to as the overall beam)and the parallel ordinary reinforced concrete slab beam(referred to as the parallel beam)of a heavy haul railway were taken as the research objects.Based on the field test and numerical simulation,the static performance test,dynamic performance test,bearing capacity analysis,and speed-raising and shaft-raising adaptability analysis were carried out to explore the differences and applicability of small-span low-height slab beams under heavy axle load transportation conditions.The results show that both the small-span parallel beam and the whole beam are inelastic working state under the designed static and live load.The load-deflection and load-strain curves of the two types of plate beams show linear changes,and the measured data of strain and deflection are less than the theoretical calculation value.Under the same static load,the measured key parameters such as mid-span deflection and strain of the integral beam are smaller than those of the parallel beam,and the integral beam has greater stiffness and bearing capacity.Under normal operation,speed increase,and axle load increase,the transverse and vertical frequencies of the integral beam are 27.26 Hz and 11.21 Hz,respectively,and the selfvibration frequency is significantly higher than that of the parallel beam.At the same time,under the same dynamic load,the transverse amplitude,transverse acceleration,vertical amplitude,vertical acceleration,and dynamic coefficient of the whole beam are significantly lower than those of the parallel beam.The whole beam has greater t
作者
陈树礼
刘永前
陈士通
许宏伟
崔春锴
CHEN Shuli;LIU Yongqian;CHEN Shitong;XU Hongwei;CUI Chunkai(School of Safety Engineering and Emergency Management,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Infrastructure Safety and Emergency Railway Industry,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2023年第4期1403-1415,共13页
Journal of Railway Science and Engineering
基金
国家重点研发计划重点专项(2016YFB1200401-107)
国家自然科学基金资助项目(52008272)
河北省重点研发计划项目(20375410D)。
关键词
大轴重
小跨度梁
适应性研究
静力试验
运营性能试验
large axle load
small span beam
adaptability research
static test
operation performance test
