粘弹性基础上的长细梁大挠度模型及其应用  

APPLICATION AND MODEL BUILDING OF SLENDER BEAM AND LARGE DEFLECTION ON THE VISCOELASTIC FOUNDATION

作　　者：陈春霞[1] 张燕[1] 

机构地区：[1]上海师范大学建筑工程学院,上海201418

出　　处：《建筑技术开发》2010年第8期12-16,共5页Building Technology Development

基　　金：上海师范大学校级科研项目DKL928

摘　　要：针对软土-隧道体系这样复杂的三维结构,现阶段还没有已成形的模型可以应用,在理论分析上存在较大困难;而在整段已运营地铁隧道中进行大型现场试验,也并无先例可循,使得试验系统需要输入的很多数据不好估计范围。针对以上问题,建立了软土-隧道动力学模型,该模型采用了粘弹性基础上的大挠度长细梁,选取了与实测段一致的尺寸,考虑了不同的支座边界条件,用Mathematic编制程序,计算出模型的前十阶自振频率和前三阶振型,计算结果可用于与实测数据对比。At the present stage, theoretical analysis on the soft soil-tunnel system which is complicated three-dimensional structure is provided with great limitations. The reason is that the mature model can＇t be used. Now we will develop the spot experiment in the operated subway tunnel, but a little date makes it difficult in estimation data range in experiment system. To solve the above problem, we create the soft soil-tunnel dynamic model, which is the model of slender beam and large deflection on the viscoelastic foundation. This model selects the same dimension as the spot experiment, takes into account the different boundary conditions, and completes the calculation of natural frequency and vibration mode using Mathematic. Its calculation results can be used to compare with the experiment data.

关 键 词：软土-隧道体系 粘弹性基础 大挠度模型 自振频率 振型 

分 类 号：TU348[建筑科学—结构工程]