摘要
基于有限元理论,建立了地铁矩形、圆形隧道内整体道床弹性地基上的"梁-板"有限元模型。通过数值模拟计算了不同混凝土等级下整体道床的变形受力情况。通过对计算结果的分析表明:在给定的配筋情况下,钢筋应力值和裂缝宽度满足容许值。矩形、圆形隧道内整体道床在常用列车荷载与降温荷载共同作用下,随着降温幅度的增大,整体道床垂向位移呈现增大趋势;纵向压应力下降幅度较大;横向压应力呈现先增大后减小的趋势;当降温幅度相同时,采用C25混凝土强度等级时整体道床垂向位移值最大。
Based on the finite element theory, the beam- plate finite element model of solid bed in rectangular and circular tunnels is established. Then the deformation and stress of solid bed in different concrete grades is analyzed, the result shows that the steel stress and crack width could meet the allowable value in such reinforcement. In rectan- gular and circular tunnels, under common train load and temperature load, following the increase of cooling magni- tude, the solid bed vertical displacement will increase; while the longitudinal compressive stress will decrease greatly; and the transverse compressive stress increases first and decreases soon afterwards. When the cooling magnitude is the same, and the grade of C25 concrete strength is adopted, the maximum vertical displacement of solid bed will happen.
出处
《城市轨道交通研究》
北大核心
2015年第2期16-18,23,共4页
Urban Mass Transit
