CAJ | 학술논문

建立一种桥上CRTSⅡ型板式无砟轨道纵向力学模型,取消部分区段的扣件纵向阻力以模拟维护作业对轨道和桥梁受力的影响。利用所建力学模型对一座80 m+128 m+80 m大跨度连续梁桥上CRTSⅡ型板式无砟轨道松开扣件进行线路维护作业的纵向力变化进行分析,结果发现：钢轨纵向力最大变化值为64.82 kN,相当于轨温变化3.38℃产生的温度力；底座板纵向力最大变化值为52.75 kN；剪力齿槽和桥梁固定支座的纵向力变化均在20 kN以下。松开扣件维护作业对钢轨、底座板、剪力齿槽和固定支座的强度影响可承受,按现行《高速铁路无砟轨道线路维修规则》对大跨度连续梁桥上CRTSⅡ型板式无砟轨道松开扣件进行维护作业是可行的。
건립일충교상CRTSⅡ형판식무사궤도종향역학모형,취소부분구단적구건종향조력이모의유호작업대궤도화교량수력적영향。이용소건역학모형대일좌80 m+128 m+80 m대과도련속량교상CRTSⅡ형판식무사궤도송개구건진행선로유호작업적종향력변화진행분석,결과발현：강궤종향력최대변화치위64.82 kN,상당우궤온변화3.38℃산생적온도력；저좌판종향력최대변화치위52.75 kN；전력치조화교량고정지좌적종향력변화균재20 kN이하。송개구건유호작업대강궤、저좌판、전력치조화고정지좌적강도영향가승수,안현행《고속철로무사궤도선로유수규칙》대대과도련속량교상CRTSⅡ형판식무사궤도송개구건진행유호작업시가행적。
A longitudinal mechanical model of CRTSⅡ slab track on the bridge is set up to simulate the effects of track maintenance operation on the stress of the track and bridge by eliminating fasteners'longitudinal resistance in some track sections. The longitudinal stress changes of CRTSⅡ slab track and 80 m+128 m+80 m long span continuous beam bridge with fasteners loosed for maintenance operation are analyzed with the model. The results show that the maximal rail longitudinal stress change is 64. 82 kN, equaling to its temperature stress caused by 3. 38℃ change. The maximal longitudinal foundation plate stress change is 52. 75 kN. The Longitudinal stress changes of shear alveolar and fixed support are both smaller than 20 kN. The effects of track maintenance with loosed fasteners on the strength of the rail, foundation plate, shear alveolar and fixed support are acceptable. Therefore, it is feasible to loose fasteners and conduct track maintenance on CRTSⅡ slab track on long span continuous beam bridge according to current Regulations for High-speed Railway Ballastless Track Maintenance.