【作者】 刘晨箐；

【导师】 刘光栋； 方志；

【作者基本信息】 湖南大学 ， 桥梁与隧道工程， 2004， 硕士

【摘要】 本文结合湖南省交通厅批准立项的钢筋混凝土圆管涵合理设计与施工方法研究课题，从工程实用的角度出发，对高等级公路中圆管涵在振动压路机作用下的受力性能进行了研究，主要内容包括： 1．通过对安装在振动压路机上振动器工作原理的详细说明，解释了振动压路机产生振动的原因以及与静力压路机的区别。 2．详细分析了目前针对振动压路机设计而建立起来的各种压路机——土壤力学模型，并对振动压路机设计中普遍采用的Tai-SungYoo模型建立微分方程组，运用Matlab进行求解，得到振动轮对土壤的作用。 3．通过相应的假设，本文提出将振动压路机激振力与前轮分配重量之和作为压路机对土壤的作用荷载，并将该荷载用于有限元的计算中，通过对计算结果与实测数据的比较认为本文提出的对作用荷载的模拟较为合理。 4．现场试验测试了不同填土高度时振动压路机作用下涵管的各项响应值，观察到振动压路机对涵管作用随填土高度增大而减小的趋势。 5．本文将涵管及其周围土体作为整体研究对象，考虑土体参与结构的相互作用，采用大型有限元分析软件ANSYS对其进行了三维动力弹性分析，并将计算结果与实测结果进行了比较。认为运用ANSYS所建立的三维模型符合实际情况。 6．通过横轴向不同填土高度强弱振的计算与对比，经回归分析得到了管顶内侧拉应变与填土高度、振动压路机激振力以及自重有关的计算公式。在此基础上，对振动压路机在不同激振力的情况下进行组合与计算，得到不同组合情况下的临界填土高度。 7．以强弱振幅值作为静力荷载对涵管进行分析，并将结果与相应动力进行比较，得到动力冲击系数。在与各相关规范的比较中，本文认为现行公路规范中的动力冲击系数偏小，建议采用本文提供的动力冲击系数。更多还原

【Abstract】 In this thesis, the following contents about the response of the circular culvert, which is buried in the highway and under the action of vibratory roller, have been studied. The main contents are as follows:1. Through describing the vibrator’s working principles, the vibratory function is demonstrated. Also dose the distinction between vibratory roller and static one.2. Lot kinds of models about the vibratory roller-soil are analyzed considering the roller design. Among them, the Tai-SungYoo’ model is adopted ordinarily as the standard one in vibratory roller’s design. According to the model, the dynamic differential equations are established. With the application of software MatLab, the solutions of the equations are achieved, then the dynamic load which roller applies to the soil is determined.3. By corresponding assumptions, another dynamic load is presented by this thesis. The load’s numerical value equals to the sum of vertical centrifugal force and the weight supported by the front drum. Using it the calculation in the chapter back indicates the load is in accord with the actual conditions.4. In the field test, the response of the culvert under the action of vibratory roller and different soil height are measured. It is found with the rise of the soil height the response of the culvert becomes weaker and weaker.5. Considering the interaction of soil and structure, the soil is taken as part of the whole 3D model with culvert. The FEM analysis of the whole model has been completed by using the analytic software-ANSYS. The rationality of the whole model is confirmed by the result comparison of calculate conclusion and field test.6. The expression of the strain on top culvert is achieved through regression analysis and the comparison of different soil heights and load grades in the culvert axis-upright direction. Based on the expression, the critical soil heights under the combination of different load gradesand roller’s weights are achieved.7. Corresponding with the vibratory action, the static analysis is processed, and the impact factor is got through the comparison of the two calculated conclusion. The same time, the impact factors given by the corresponding codes are smaller comparatively. The factor presented in the thesis is recommended.更多还原