地面汽车荷载影响下邻近建筑物的振动响应规律研究

发布时间：2018-01-24 22:34

本文关键词： 汽车荷载有限元方法结构振动响应环境影响评估　出处：《河北工程大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国工业化的迅猛发展,不仅使得城市化进程加剧,而且促使汽车数量急速增加,汽车荷载引起的环境振动问题日益凸显。汽车荷载的动态作用特性会诱发邻近建筑物的二次振动,严重时会直接影响居民居住舒适度及精密仪器的正常使用。因此,本文采用有限元方法对汽车荷载影响下建筑结构的振动响应规律、环境影响程度进行了深入分析,本文主要工作如下:1、利用有限元方法建立了汽车荷载-地基-建筑物的三维模型。将汽车荷载简化为简谐变化的冲击荷载,建筑物选用框架结构模型,并考虑不同土质对建筑结构振动响应的影响。最后分析了汽车荷载影响下建筑物振动响应的整个过程。2、为了解决振动波在数值模型边界处的反射,介绍了粘弹性边界和无限元两种常用的边界处理方法,结合已有算例对比分析了两种方法的精度。结果表明无限元边界处理方法精度更好,因此,无限元方法作为地基振动等相关问题的边界处理方法具有更多优势。3、结合本文数值模型,对振源距离、路面不平整度、地基土质、行车速度、汽车荷载轴重等因素进行了深入分析。以建筑物的振动加速度、幅频特性为指标评价了结构振动响应变化规律,以振级指标评价了振动引起的环境影响程度。结果表明:减小振源距离、增大路面不平整度、提高汽车行驶速度、增大汽车荷载轴重、地基土土质软化都会使建筑物结构振动响应变大,环境影响程度加强。
[Abstract]:The rapid development of our country's industrialization not only makes the urbanization process aggravation, but also impels the automobile quantity to increase rapidly. The problem of environmental vibration caused by vehicle load is becoming more and more serious. The dynamic characteristics of vehicle load will induce the secondary vibration of adjacent buildings. When it is serious, it will directly affect the residents' living comfort and the normal use of precision instruments. Therefore, the finite element method is used to the vibration response law of the building structure under the influence of vehicle load. The main work of this paper is as follows: 1. Using the finite element method, the three-dimensional model of vehicle load-soil-building is established, and the vehicle load is simplified as a harmonic impact load. The frame structure model is selected and the influence of different soil quality on the vibration response of building structure is considered. Finally, the whole process of building vibration response under the influence of automobile load is analyzed. In order to solve the problem of vibration wave reflection at the boundary of the numerical model, two common boundary treatment methods, viscoelastic boundary and infinite element, are introduced. The accuracy of the two methods is compared with existing examples. The results show that the accuracy of the infinite element boundary processing method is better. The infinite element method as the boundary treatment method of foundation vibration and other related problems has more advantages. 3. Combined with the numerical model of this paper, the vibration source distance, road roughness, foundation soil, driving speed. Based on the vibration acceleration and amplitude-frequency characteristic of the building, the variation law of structural vibration response is evaluated. The degree of environmental impact caused by vibration is evaluated with the index of vibration level. The results show that the distance of vibration source is reduced, the road roughness is increased, the driving speed of the vehicle is increased, and the load axle load of the vehicle is increased. The softening of foundation soil will increase the vibration response of building structure and strengthen the environmental impact.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU311.3

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