地震工程学报Issue(4)：857-867,11.DOI:10.3969/j.issn.1000-0844.2014.04.0857
无砟轨道路基列车动载激励及动力响应三维数值模拟
Three-dimensional Numerical Simulation for Vehicle Dynamic Load and Dynamic Response of Ballastless Track Subgrade
摘要
Abstract
With the development of high-speed railways,ballastless tracks are widely applied,and the dynamic characteristics of the subgrade form the basis for design,construction,and mainte-nance of the ballastless track/subgrade system.In a sense,the distribution rule of dynamic re-sponse under the action of train loads and the influence of subgrade parameters lags far behind the construction of high-speed railways in engineering because it is highly complicated.The dynamic system,which includes rail,track,and roadbed,is so complex that it cannot be solved by available theory.In this paper,the numerical simulation method is introduced to describe the dynamic action of a roadbed bearing high-speed rail loads.A three-dimensional(3D)finite element model of the track-subgrade system is established with the aid of ANSYS for dynamic response of ballastless track subgrades bearing vehicle dynamic loads and load input behavior.Moreover,by using the choice method and basis of unit type,a constitutive model of subgrade and material parameters is established.According to the distribution mode and behaviors of vehicle dynamic load and load in-put characteristics,a two-car,eight-wheelset vehicle model was introduced to obtain contact pres-sure time-history curves of fastening when two bogies pass between neighboring cars through Fourier transform.In addition,the rationality and applicability of the model are verified according to the data obtained from in situ testing.Vertical dynamic stress,dynamic displacement,and dy-namic acceleration are calculated for a CRTS II-type slab ballastless track and a double-block bal-lastless track when a passing train has a speed of 300 km/h and an axle load of 170 kN.Further-more,the relationship between the response laws and the rail-subgrade construction are analyzed. Interrelated analyses reveal that vertical dynamic stress,dynamic displacement,and dynamic ac-celeration decay with an increase in roadbed depth.Dynamic acceleration decay deceleration was the fastest.In addition,the type of track influenced the dynamic response only at the top of the roadbed.关键词
无砟轨道路基/列车动荷载/动力响应/数值模拟Key words
ballastless track subgrade/vehicle dynamic load/dynamic response/numerical simu-lation分类
交通工程引用本文复制引用
王晅,张家生,王启云..无砟轨道路基列车动载激励及动力响应三维数值模拟[J].地震工程学报,2014,(4):857-867,11.基金项目
国家自然科学基金项目(51378514) （51378514）
高速铁路建造技术国家工程实验室开放基金(30120512) （30120512）
