摘要
为研究连续梁桥上有轨电车嵌入式轨道结构在温度荷载作用下的受力变形特性及影响因素,采用线性弹簧模拟梁轨相互作用,建立嵌入式轨道-桥-墩一体化有限元计算模型。以实际工况为例,确定伸缩工况下合理的连续梁两侧简支梁跨数,并探讨梁体温差、高分子材料纵向阻力、小阻力高分子材料铺设范围和桥梁支座布置方案对轨道结构伸缩受力和变形分布规律的影响。研究结果表明:对于多联连续梁桥,当计算伸缩工况时,可取连续梁两侧各5跨简支梁作为边界条件;随着高分子材料纵向阻力的增加,伸缩力逐渐增大,而轨板相对位移逐渐减小,故在设计嵌入式轨道桥上无缝线路时,应综合考虑轨道结构受力和变形的要求;针对本文工况,当从减小钢轨附加伸缩力的角度考虑时,应该选择在连续梁桥左边跨和相邻一跨简支梁上铺设小阻力高分子材料;当桥梁温度跨度较大时,可将连续梁相邻一跨简支梁的固定支座放置在连续梁桥的边墩处,从而使得连续梁桥温度跨度减小。
In order to study the force and deformation characteristics of embedded track structure of tram on continuous beam bridge under temperature loading and its influencing factors,an integrated finite element model of embedded track-bridge-pier was established by using linear spring to simulate the interaction of beam and rail.Taking the actual working conditions as an example,the reasonable span number of the simple beam on both sides of the continuous beam under the working condition of the expansion-constriction was determined.And the influence of the beam temperature difference,the longitudinal resistance of polymer materials,the laying range of small-resistance polymer materials and the bridge abutment arrangement on the distribution law of stress and deformation of track structure was also discussed.The results show that for the multi joint continuous beam bridge,when calculating the expansion-constriction working conditions,it is advisable to use five simply supported beams on both sides of the continuous beam as the boundary conditions.With the increase of the longitudinal resistance of polymer materials,the expansion-constriction force will increase gradually and the relative displacement between rail and substructure will decrease gradually.Therefore,when designing the embedded track CWR on bridge,the stress and deformation of the track structure should be considered synthetically.Thirdly,according to the condition of this paper,from the point of view of reducing the additional expansion-constriction force of rail,the small resistance polymer material should be laid on the left span of the continuous beam bridge and the adjacent one-span simply supported beam.Finally,when the bridge temperature span is large,the fixed support of the adjacent span simply supported beam can be placed on the side pier of the continuous beam bridge,so that the temperature span of the continuous beam bridge decreases.
作者
冯青松
孙魁
雷晓燕
刘庆杰
张鹏飞
FENG Qingsong;SUN Kui;LEI Xiaoyan;LIU Qingjie;ZHANG Pengfei(Engineering Research Center of Railway Environmental Vibration and Noise,Ministry of Education,East China Jiaotong University,Nanchang 330013,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第1期50-56,共7页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51668020
51368020
51878277)
关键词
现代有轨电车
嵌入式轨道
连续梁桥
伸缩力
modern tram
embedded track
continuous beam bridge
expansion-constriction force
