考虑跨数和墩高随机的目标震致轨道几何不平顺研究  

Study on Target Earthquake-induced Geometric Track Irregularity Considering Random Span Number and Pier Height

作　　者：余建 蒋丽忠[1,2] 周旺保[1,2] 冯玉林 赖智鹏 刘祥 YU Jian;JIANG Lizhong;ZHOU Wangbao;FENG Yulin;LAI Zhipeng;LIU Xiang(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha 410075,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075 [3]华东交通大学土木建筑学院,江西南昌330013 [4]福建工程学院土木工程学院,福建福州350118

出　　处：《铁道学报》2023年第9期123-132,共10页Journal of the China Railway Society

基　　金：国家自然科学基金(51408449,51778630,52078487);湖南创新型省份建设专项(2019RS3009);中南大学创新驱动计划(502501006)。

摘　　要：我国高速铁路规划布局逐渐向西部地震地区延伸,列车震后速度阈值计算的关键在于目标震致轨道几何不平顺的确定。基于短时傅里叶变换和零相位分布假定,提出一种目标震致轨道不平顺的计算方法,探讨考虑跨数和墩高随机的目标震致轨道不平顺等效方法。研究结果表明:震致轨向不平顺幅值显著,其余不平顺幅值基本为零;震致轨道几何不平顺的低频成分在演变功率谱密度密度中占据主导地位;震致轨道几何不平顺集的演变功率谱密度具有稳定性,满足对数正态分布假定;计算目标震致轨道几何不平顺时,跨数随机结构可按照9跨进行等效,墩高随机结构可按照与其最高墩高度相同的等墩高结构等效。China′s high-speed railway construction is gradually extending to western earthquake-prone areas.The key to calculating the speed threshold of trains after earthquakes is to determine the target earthquake-induced geometric track irregularity(TEGTI).Based on short-time Fourier transform and the assumption of zero phase distribution,a calculation method of TEGTI was proposed,followed by a discussion on the equivalent method of TEGTI considering random span number and pier heights.The results show that under the action of transverse earthquakes,tracks suffer obvious alignment irregularity,and the amplitude for cross-level,vertical and gauge irregularity is basically zero.The low-frequency components of earthquake-induced geometric track irregularity play a leading role in the evolution power spectral density.The evolution power spectral density of earthquake-induced track alignment set is stable and meets the assumption of lognormal distribution.When calculating TEGTI,the structures with random span number can be equivalent as the structures with 9 spans,and the structures with random pier heights can be equivalent as the structures with equal pier height(taking the highest pier height).

关 键 词：随机地震 震致轨道几何不平顺 短时傅里叶变换 演变功率谱密度 假设检验 

分 类 号：U24[交通运输工程—道路与铁道工程]