CAJ | 학술논문

无砟轨道轨道板在施工和运营中存在空洞及裂缝等伤损，伤损的出现会改变结构的动力学特性，由模态分析理论可知，系统特性的改变必然会引起模态参数的改变。建立轨道板-砂浆有限元模型，通过单元刚度的折减来模拟轨道板单处伤损和多处伤损，运用曲率模态识别伤损的方法对轨道板横向和纵向分别进行曲率模态计算分析。计算结果表明：轨道板横向和纵向任一方向的曲率模态和曲率模态差都能准确的识别出伤损位置，并且可以依据这两个指标识别出轨道板的多处伤损。
무사궤도궤도판재시공화운영중존재공동급렬봉등상손，상손적출현회개변결구적동역학특성，유모태분석이론가지，계통특성적개변필연회인기모태삼수적개변。건립궤도판-사장유한원모형，통과단원강도적절감래모의궤도판단처상손화다처상손，운용곡솔모태식별상손적방법대궤도판횡향화종향분별진행곡솔모태계산분석。계산결과표명：궤도판횡향화종향임일방향적곡솔모태화곡솔모태차도능준학적식별출상손위치，병차가이의거저량개지표식별출궤도판적다처상손。
Hollows and cracks develop in ballastless track slab during construction and operation. The occurrence of the damages will change the system dynamic characteristic. The modal analysis theory shows the change of the system characteristics will inevitably change the modal parameters. This paper illustrates the process to establish the finite element model of track slab-mortar, and to simulate single damage and multi damages of track slab by means of stiffness reduction of element. The calculation and analysis of curvature modal in transverse or longitudinal direction of track slab is conducted with the method of curvature modal damage identification. The results show that the curvature modal and curvature modal difference in either transverse or longitudinal direction of track slab can locate a single damage and multiple damages of track slab can also be identified.