摘要
研究目的:日照温度作用下,桥梁墩身向阳和背阳侧产生温差,从而导致墩顶发生横向位移,进而引起梁体、轨道横向偏移,最终使桥上钢轨产生横向不平顺。为指导桥墩设计和轨道养护维修,本文以高速铁路双块式无砟轨道-简支梁桥为研究对象,采用单位载荷法,分析墩顶横向位移与温差、墩高、墩宽的关系;基于线-桥-墩相互作用原理,推导墩顶横向位移与钢轨变形的映射关系,并提出相应的解析表达式。研究结论:(1)日照温度作用下桥墩墩顶位移与截面方向温差和墩身高度平方成正比,与其截面横向宽度成反比;(2)钢轨随桥墩墩顶横向移动产生的变形与其横向位移成正比,并与扣件间距、钢轨横向抗弯刚度等参数有关;(3)基于墩顶横向位移和钢轨变形之间映射关系的解析表达式,可以根据墩高、墩宽、桥墩温度差等参数,十分方便地得到钢轨横向变形曲线,对于指导桥墩设计和轨道养护维修具有参考价值;(4)本研究成果对于研究桥上其他单元式无砟轨道桥墩横向位移与钢轨变形的映射关系具有参考价值。
Research purposes： Under the influence of sunshine temperature, the sun side and the dorsal side of the bridge pier body produce temperature difference, leading to the lateral displacement of the pier top, further causing the lateral deviation of the beam and the track and ultimately giving rise to the lateral irregularity of the rail on the bridge. In order to guide design of the pier and maintenance of the track, this paper takes double - block ballastless track of high - speed railways on the simply supported beam bridges as the research object. By adopting unit load method, the relationship between lateral displacement and temperature difference, pier height and pier width is analyzed. Moreover, based on the principle of the interaction among lines, bridge, and piers, the mapping relationship between the lateral displacement of the pier top and the deformation degree of the rail is deduced, and the corresponding analytic expression is also proposed. Research conclusions： （ 1 ） The displacement of the pier top under the influence of sunshine temperature .is proportional to temperature difference in section direction and the square of the height of the pier, which is inversely proportional to the transverse width of the cross section. （2） The rails are deformed with the lateral movement of the pier top, and its deformation degree is proportional to the lateral displacement of the pier top and is related to the parameters such as the spacing between the fasteners and the transverse flexural rigidity of the rail. （3） Based on the analytic expression of the mapping relationship between the lateral displacement of the pier and the deformation of the rail, the transverse deformation curve of the rail can be obtained easily according to the parameters such as pier height, pier width and pier temperature difference, which are of reference value for guiding design of the pier and maintenance of the track. （4） The research results of this paper have a reference value for studying the mapping relation
出处
《铁道工程学报》
EI
北大核心
2017年第11期51-56,75,共7页
Journal of Railway Engineering Society
基金
中南大学研究生创新项目(2017zzts745)
高速铁路基础研究联合基金项目(U1334203)
南昌铁路局科技研究开发计划课题(201524)
中国铁路总公司科技研究开发计划课题(2014G001-D)
关键词
日照温度
双块式无砟轨道
墩顶横向位移
钢轨变形
映射关系
sunshine temperature
double - block ballastless track
the lateral displacement of the bridge pier top
raildeformation
mapping relationship
