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建立CRTSⅠ型轨道板有限元模型,对0.5℃/cm温度梯度荷载作用下的轨道板变形及应力进行分析。计算结果表明,轨道板“上冷下热”温度状况下变形为中部下沉四角翘曲,最大翘曲量为1.37 mm,上表层出现拉应力,最大值为1.97 MPa;“上热下冷”温度状况下变形为中部上拱四角下沉,最大上拱量为0.65 mm,下表层出现拉应力,最大值为2.05 MPa;轨道板抗上拱能力比抗四角上翘能力强。将理论计算与现场实测数据进行比较,二者吻合较好。分析认为在板体温度均匀或“上冷下热”情况下灌注CA砂浆有利于防止四角离缝过大,指出板上下表面纵横向均将受到温度拉、压应力的反复作用,为防止板体开裂,须采用双层双向预应力体系并严格保证施加质量。
The CRTS Ⅰ track plate finite element model was established to analyze the deformation and stress of the track plate under the temperature gradient load of 0.5 ℃ / cm. The results show that the warp of the middle plate sinks to 1.37 mm and the maximum strain is 1.97 mm, and the maximum value is 1.97 MPa. Under the cold “under the condition of deformation deformation of the central four corners of the arch sinking, the largest arch on the amount of 0.65 mm, the lower surface of the tensile stress occurs, the maximum value of 2.05 MPa; Comparing the theoretical calculation with the field measured data, the two are in good agreement. It is considered that CA mortar infusing CA mortar at a uniform temperature of the plate body or under the condition of ”cooling down on the cold" is good for preventing the seams from being excessively large. It is pointed out that the vertical and horizontal surfaces of the upper and lower plates will be repeatedly subjected to temperature pull and compressive stress, Board cracking, to be double-bi-directional prestressed system and strictly ensure the quality of application.