论文部分内容阅读
基于系统动力学和有限元理论,建立荷载-板式轨道力学分析模型,模拟了路基余弦不均匀沉降对板式轨道结构动力响应的影响,分析了不同路基沉降量对轨道板和混凝土底座的动应力和动位移的差异影响。结果表明:在速度为300 km/h的移动荷载下,路基沉降量从0 mm增加到30 mm,混凝土构件的纵向应力、垂向应力、动位移呈先陡后缓的增长趋势,拐点为20 mm沉降量;处于沉降槽起始部位的1号轨道板上表面和位于沉降槽中心的3号混凝土底座下表面受沉降量影响最大,为易发生破坏部位。
Based on the theory of system dynamics and finite element, the load-plate mechanical analysis model is established to simulate the influence of uneven settlement of subgrade cosine on the dynamic response of the slab track structure. The dynamic response of the track slab and concrete base to dynamic response of the slab- Differences in the effects of dynamic displacement. The results show that under the moving load of 300 km / h, the settlement of roadbed increases from 0 mm to 30 mm. The longitudinal stress, vertical stress and dynamic displacement of concrete members show the first steep and then slow increasing trend, and the inflection point is 20 mm settlement. The upper surface of track No. 1 in the initial part of the settling tank and the lower surface of the No. 3 concrete base in the center of the settling tank are most affected by the settlement, which is prone to damage.