【作者】 董飞； 董军； 孙玮泽；

【Author】 DONG Fei~1,DONG Jun~(1,2),SUN Wei-ze~1 (1.School of Civil Engineering and Traffic Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China; 2.Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials,Beijing 100044,China)

【机构】 北京建筑工程学院土木与交通工程学院； 工程结构与新材料北京市高等学校工程研究中心；

【摘要】 基于在建地铁工程,使用刚度折减体现地铁隧道结构在运营期不同阶段的疲劳劣化行为。利用数值模拟研究长期循环动载作用下含初始损伤的地铁隧道动力学响应,得到隧道在不同损伤程度下一次列车荷载作用后的结构响应。对比分析了在左线隧道列车动载下,左(右)线隧道不同测点的加速度响应,特别是在三种刚度下左(右)线隧道拱顶、右侧拱墙及仰拱的动力响应。研究结果表明,刚度的衰减对结构的动力响应影响较小,但是在长期荷载作用下在疲劳裂纹处容易产生较大的应力集中进而使结构发生突然破坏。更多还原

【Abstract】 Based on a subway construction project,deterioration characteristics of the existed subway tunnels under long-term train loads is studied by using the method of stiffness discount which could reflect fatigue damage of the structure in this paper.Firstly, dynamic response of the tunnel with initial defect under long-term train loads is analyzed according numerical simulation,and some results under different degree of fatigue are obtained.Then,numerical results of acceleration responses at different points such as the upper vault,the side wall and the inverted arch in two tunnels,and compared with each other while the train loads is applied at the left tunnel,especially under three different stiffness.Our investigation shows that local structural damage in the position with initial cracks will be caused by a high cycle stress although there are fewer influences of stiffness changes on dynamic response of tunnels.更多还原