摘要
针对高速铁路桥梁新旧线并行修建引起的横桥向墩台不均匀沉降的问题,利用ABAQUS有限元分析方法,选取高速铁路常用的32 m标准双线多跨简支梁桥,建立CRTSⅢ型单元板式无砟轨道-桥梁-墩台空间静力耦合模型;考虑不同沉降类型和沉降幅值,研究横桥向桥墩不均匀沉降对轨道结构层间受力及其轨面变形规律,在此基础上提出适用于该桥型的单、双墩横桥向不均匀沉降静态损伤分级及维修建议。结果表明:横桥向墩台不均匀沉降对轨面高低不平顺影响最大,其次为扭曲和水平不平顺,且沉降墩顶处易出现变形极值;横桥向墩台仅单侧沉降时,单墩沉降差10、15、20 mm,伤损等级依次为Ⅱ、Ⅲ、Ⅳ级;需要关注桥墩横桥向双侧沉降情形,损伤比单侧沉降更严重;当沉降差达到20 mm时,自密实混凝土层横向拉应力超过C40混凝土抗拉强度限值,轨道结构存在开裂风险。建议日常保养时单、双墩横桥向不均匀沉降控制在10 mm及以下,应避免出现沉降15 mm及以上的不利情形。
Due to the uneven transverse settlement of bridge piers caused by the parallel construction of existing and new high-speed railway lines,a CRTSⅢslab track-bridge system static-coupled model was established using the ABAQUS finite element analysis method for a commonly used 32 m standard double-track multi-span simply supported beam bridge in high-speed railways.Considering different settlement types and settlement amplitudes,this paper studies the force between layers of track structure and the deformation law of rail surface caused by the uneven settlement of piers in the transverse direction.On this basis,the static damage classification and maintenance suggestions for the uneven settlement of single and double piers in the transverse direction under this type of bridge are proposed.Based on this analysis,static damage classification and repair recommendations were proposed for single and double-pier uneven transverse settlement of this bridge type.The results have shown that the uneven settlement of the pier in a transverse direction has the greatest influence on the vertical irregularity of the rail surface,followed by the distortion and the horizontal irregularity,and the deformation extremum is easy to appear at the top of the settlement pier.When the unilateral settlement of the pier in the transverse direction of the bridge,the settlement difference between the singer pier of 10 mm,15 mm and 20 mm,its damage classification is rated asⅡ,ⅢandⅣ.It is necessary to pay attention to the bilateral settlement of the pier across the bridge,and the damage is more serious than the unilateral settlement.When the settlement difference of the transverse direction reaches 20 mm,the transverse tensile stress of the selfcompacting concrete layer exceeds the tensile strength limit of C40 concrete,and the track structure has the risk of cracking.It is recommended that the uneven settlement in the transverse direction of the single and double piers should be limited to 10 mm or less for daily maintenance and that adverse settlement of 15 mm or more should be avoided.
作者
余翠英
杨沁婕
罗文俊
马斌
YU Cuiying;YANG Qinjie;LUO Wenjun;MA Bin(School of Science,East China Jiaotong University,Nanchang 330013,P.R.China;School of Civil and Architectural Engineering,East China Jiaotong University,Nanchang 330013,P.R.China;China Railway Second Bureau Group Co.,Ltd.,Chengdu 610013,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2024年第2期154-164,共11页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(52068028)
江西省自然科学基金(20212BAB204015)
江西省教育厅科技资助项目(GJJ190329)
华东交通大学博士启动资金(452)。
关键词
高速铁路
简支箱梁
墩台沉降
横桥向沉降
受力变形
静态损伤分级
high-speed railway
simply-supported box girder
pier settlement
transverse settlement
stress and deformation
static damage classification
