大跨度斜拉桥在自然风场中易因自身柔度特性发生位移变形。为研究静风荷载作用下大跨斜拉桥上CRTS双块式无砟轨道无缝线路桥梁及轨道结构在空间三向的力学性能分布规律，参照某一四线预应力混凝土斜拉桥工程实例，基于有限元法建立了大跨斜拉桥上无缝线路精细化空间耦合模型，分析了横桥向静风荷载作用下桥梁体系及桥上轨道结构的力学性能。分析结果表明：桥梁及桥上轨道结构三向（应）力最大值基本分布在斜拉桥跨中及边墩附近；各结构三向（应）力中，底座板、桥梁结构纵向应力峰值最大，约为横向应力峰值的8倍左右，约为竖向应力峰值的7倍、15倍左右，轨道板结构表现为横向应力峰值最大，且与其余两向应力峰值之间差距较小；各结构三向位移中，横向、竖向位移均在跨中及附近达到最大值，纵向位移在斜拉桥边墩附近达到最大值，其中，横向位移峰值是其余两向位移峰值的20余倍；桥梁两侧构件竖向、纵向位移方向相反，即桥梁表现为静风作用下的倾覆、弯曲倾向。研究成果可为风环境中大跨斜拉桥上线路设计、维护检修以及健康监测提供理论依据。
Abstract
Long span cable-stayed bridges are prone to displacement and deformation due to beam flexibility in natural wind field, in order to study the distribution law of mechanical properties of bridge and track structures of CRTS double slab ballastless track continuous welded rails (CWR) on the long-span cable-stayed bridge under static wind load. taking a four line prestressed concrete cable-stayed bridge as the engineering background, a refined spatial coupling model of CWR on long-span cable-stayed bridge is established based on finite element method, and the mechanical properties of bridge system and track structures on the bridge under transverse static wind load are analyzed. The analysis results show that the maximum of the three direction forces (stresses) of the bridge and the track structures on the bridge is basically distributed in the middle span and near the side pier of the cable-stayed bridge; In the three direction forces (stresses) of each structures, the longitudinal stress peak of the base plate and bridge structure is the largest, about 8 times of the transverse stress peak, and about 7 and 13 times of the vertical stress peak, the transverse stress of track plate shows the maximum peak value, and the gap with the peak value of the other two direction stresses is small; In the three direction displacements of each structures, the transverse and vertical displacements reach the maximum at and near the middle of the span, and the longitudinal displacement reaches the maximum near the side pier of the cable-stayed bridge, among them, the peak value of lateral displacement is more than 20 times that of the other two directions; The vertical and longitudinal displacement directions of the structures on both sides of the bridge are opposite, that is, the bridge is inclined to overturn and bend under the action of static wind. The research results can provide a theoretical basis for the design, maintenance, and health monitoring of long span cable-stayed bridges in wind environment.
关键词
高速铁路 /
大跨斜拉桥 /
静风荷载 /
桥上轨道结构
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Key words
High Speed Railway /
Long span Cable-stayed Bridge /
Static Wind Load /
Track Structure on Bridge
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参考文献
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