【摘要】 用弹性地基梁来模拟地下隧道结构,推出考虑弯曲、轴力、剪切、内外阻尼以及在双参数地基模型上的振动方程。引用地下管道近似的位移计算方法,计算地下隧道结构,避免积分变换的繁琐,通过一种特殊的分离变量法,使得动力荷载以强加位移和速度的方式施加,实例计算中涉及内外阻尼项,可以方便地求出自振频率和阻尼比的表达式和考虑阻尼后结构位移衰减曲线,得出对于地下结构内阻尼的影响很小的结论。更多还原

【Abstract】 The beam on elastic foundation model is used to simulate the underground tunnels structures;a vibration equation on two-parameter foundation considering the bending moment,axial force,shear deformation,external and internal damping is obtained.An approximate method for calculating of displacement of underground pipes is used to compute the displacement of underground tunnels structures,avoiding the trouble of integral transform.In numerical example involving the damping.it is convenient to use a special separated variable method to obtain natural frequencies and damping ratio,the attenuation of displacement considering damping.It is concluded that for underground structures,the effect of internal damping can be neglected.更多还原