CAJ | 학술논문

大跨桥梁端处的小阻力扣件轨下橡胶胶垫滑出现象较为普遍，为确定轨下胶垫滑出后扣件纵向阻力值及其变化规律，以客运专线无砟轨道常用的 WJ －8扣件为例，开展不同轨下胶垫滑出量条件下的扣件纵向阻力试验，测试5种不同轨下胶垫滑出量时扣件纵向阻力—位移关系；采用最小二乘法对试验数据进行曲线拟合，得出5种不同轨下胶垫滑出量时扣件纵向阻力双线性表达式。研究结果表明：随着轨下胶垫滑出量的增加，扣件纵向阻力值减小，胶垫滑出量在60 mm 以内时，扣件纵向阻力受胶垫滑出量影响明显，当胶垫滑出量大于60 mm 后，扣件纵向阻力变化不大。
대과교량단처적소조력구건궤하상효효점활출현상교위보편，위학정궤하효점활출후구건종향조력치급기변화규률，이객운전선무사궤도상용적 WJ －8구건위례，개전불동궤하효점활출량조건하적구건종향조력시험，측시5충불동궤하효점활출량시구건종향조력—위이관계；채용최소이승법대시험수거진행곡선의합，득출5충불동궤하효점활출량시구건종향조력쌍선성표체식。연구결과표명：수착궤하효점활출량적증가，구건종향조력치감소，효점활출량재60 mm 이내시，구건종향조력수효점활출량영향명현，당효점활출량대우60 mm 후，구건종향조력변화불대。
The small resistance fasteners’rubber pads slide a lot on the end of span bridges.In order to deter-mine the longitudinal resistance value and its change of small resistance fastener with the sliding of rubber pad, this paper took the WJ -8 type small resistance fasteners commonly used in ballastless track for example.A ex-periment of testing the longitudinal resistance of WJ -8 type small resistance fastener was designed,and so as to get relationship between longitudinal resistance value and displacement of WJ -8 type small resistance fastener with five kinds of different amounts of sliding of the rubber pad.The curve is fitted by the least squares method, in order to get the bilinear resistance model with the different sliding of rubber pad.The results show that:with the increasing amount of sliding of the rubber pad,longitudinal resistance value of WJ -8 type small resistance fastener decreases,while the sliding is within 60 mm.The sliding has great influence on the longitudinal resist-ance,and when the sliding without 60 mm,the sliding has little influence on the longitudinal resistance.