基于不等波长模型的II型轨道板上拱稳定性公式

来源期刊:中南大学学报(自然科学版)2020年第12期

论文作者:杨俊斌 张光明 杨荣山 刘学毅

文章页码:3566 - 3575

关键词:不等波长模型;II型轨道板;上拱稳定性;形变能

Key words:models of unequal wavelength; CRTS-II track slab; stability of the upper arch; deformation energy

摘    要:为了研究II型轨道结构在夏季高温天气时轨道板上拱伤损的形成机理,基于结构稳定性理论,采用能量准则下的不等波长模型,推导由轨道板压缩形变能、弯曲形变能及重力势能作为总能量时的轨道板上拱稳定性临界力计算公式;参考高速铁路维修规则及轨道板生产标准,确定临界力计算公式中轨道板允许变形矢度、弹性初始弯曲及塑性初始弯曲这3个关键参数;基于上述2项工作,确定计算最小临界力所需的初始波长及变形后波长;建立II型轨道板上拱稳定性三维数值模型,通过比较数值模型与临界力计算公式的计算结果,验证本文推导的临界力计算公式的正确性;将本文推导的临界力计算公式与已有的基于等波长模型的临界力计算公式的计算结果进行对比分析。研究结果表明:本文推导的临界力计算公式适用于轨道板上拱稳定性研究;在采用本文推导的临界力计算公式进行相关研究时,建议将轨道板的允许变形矢度、弹性初始弯曲及塑性初始弯曲这3个参数均取为2 mm;在相同的假设条件下,本文推导的临界力计算公式比基于等波长模型的临界力计算公式所得计算结果大15%左右。

Abstract: In order to study the formation mechanism of the upper arch damage on the track slab of the type II track structure in the high temperature weather in summer, based on the structural stability theory and the unequal wavelength model with the energy criterion, the calculation formula of the critical force of the upper arch stability of the track slab was derived. The track slab compression deformation energy, bending deformation energy and gravitational potential energy were used as the total energy. With reference to high-speed railway maintenance rules and track slab production standards, the three key parameters of the track slab allowable deformation vector, elastic initial bending and plastic initial bending in the critical force calculation formula were determined. Based on the above two studies, the length of the initial wavelength and the length of the deformed wavelength were determined to calculate the minimum critical force. A three-dimensional numerical model for the stability of the upper arch on the type II track slab was established, and the accuracy of the formula was verified by comparing the numerical model result with the calculation result of the critical force calculation formula. The calculation results of the critical force calculation formula deduced in this paper and the existing calculation results of the critical force calculation formula based on the equal wavelength model were compared and analyzed. The results show that the critical force calculation formula deduced is suitable for the study of the stability of the upper arch on the track slab. When the critical force calculation formula derived in this article for related research is applied, it is recommended to take the three parameters of the allowable deformation vector, elastic initial bending and plastic initial bending of the track slab as 2 mm. With the same assumptions, the calculation result of the critical force calculation formula deduced in this paper is about 15% larger than that of the critical force calculation formula based on the equal wavelength model.

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