基于冲击荷载作用下场道传力杆力学性能研究

发布时间：2018-07-06 07:43

本文选题：传荷系数 + 传力杆　；参考：《中国民航大学》2017年硕士论文

【摘要】：水泥混凝土道面是我国机场普遍采用的道面类型,为了减小由于温度变化所引起的内部应力,通常会在相应部位设置接缝,这使得接缝成为整个道面比较薄弱的部分,在外荷载的长期作用下,接缝处会出现沉陷、错台等病害从而影响道面的正常使用。由此看来,接缝传荷能力的检测与评价对于水泥混凝土道面的维护及延长使用寿命等方面起到很重要的作用。我国通常是用FWD设备来进行接缝传荷能力的检测,但这会存在诸如设备运输不便、加载效率低等很多弊端,为解决这些不足之处,本文提出了用跳车荷载代替FWD设备的作用,从而能够从道面板的振动特性来反映接缝传荷能力,具体研究内容如下:1.通过对比分析了不同模拟道面不平整度的方法,选用三角函数合成法模拟生成了不同等级的道面2.根据所研究的问题选取了四分之一车辆模型来模拟跳车冲击荷载,并分析了不同车辆行驶速度、不同道面平整度等因素在不同跳车高度下对于冲击系数的影响规律。3.运用ABAQUS有限元软件,建立了考虑传力杆与混凝土接触作用的三维实体模型,研究了传力杆自身参数及结构层参数对于接缝传荷系数及位移差的影响规律。4.在所建立的有限元模型上施加所求得的跳车冲击荷载,首先将提取的相应点的加速度信号导入MATLAB中进行频谱分析,得到道面板的频率、受荷板与未受荷板幅值及受荷板与未受荷板相位差,然后探讨了传力杆自身参数及结构层参数的变化对于道面板振动特性的影响规律,最后分别建立了传荷系数与(未受荷板与受荷板)幅值比、(受荷板与未受荷板)相位差之间的关系式,这对于传荷能力的评价提供了一种新的方法。5.以相似理论为基础,建立了水泥混凝土道面室外模型,通过试验分别求得了在静荷载作用下的传荷系数及冲击荷载作用下(未受荷板与受荷板)幅值比,验证了以(未受荷板与受荷板)幅值比评价传荷系数的可行性。
[Abstract]:Cement concrete pavement is a kind of pavement type commonly used at the airport in China. In order to reduce the internal stress caused by the change of temperature, the joint is usually set in the corresponding part, which makes the seam a relatively weak part of the whole pavement. Under the long-term effect of the external load, the joints will be subsided and the dislocation and other diseases will affect the road. It seems that the detection and evaluation of the transmission capacity of the joint plays an important role in the maintenance of cement concrete pavement and the prolongation of the service life. In our country, the FWD equipment is usually used to detect the capacity of the joint transmission, but there are many disadvantages such as the inconvenience of the equipment transportation and the low loading efficiency. In order to solve these shortcomings, this paper proposes the use of jumping load instead of FWD equipment, and thus can reflect the capacity of joint transfer from the vibration characteristics of the pavement panel. The specific research contents are as follows: 1. through comparison and analysis of the different simulation path roughness method, the three angle function synthesis method is selected to simulate the formation of different grade of the road surface 2. According to the problems studied, 1/4 vehicle models are selected to simulate the impact load of the vehicle, and the influence of the driving speed of different vehicles and the roughness of different road surface on the impact coefficient at different height of the vehicle.3. is analyzed by using the ABAQUS finite element software, and the three-dimensional contact of the force bar and the concrete is established. The effect of the parameters of the force pole and the parameters of the structural layer on the transfer coefficient and displacement difference of the joint.4. is applied to the finite element model. The acceleration signal of the corresponding point is first introduced into the MATLAB for frequency spectrum analysis, and the frequency of the channel panel is obtained and the loading plate is obtained. With the amplitude of the unloaded plate and the phase difference between the loading plate and the unloaded plate, the influence of the change of the parameters of the force pole and the structural layer on the vibration characteristics of the pavement slab is discussed. Finally, the relation between the load transfer coefficient and the amplitude ratio of the unloaded plate to the loaded plate, and the phase difference between the charged plate and the unloaded plate, is established. The evaluation of load transfer capability provides a new method,.5., based on the similarity theory, and establishes an outdoor model of cement concrete pavement. Through the test, the load transfer coefficient and the amplitude ratio of the unloaded plate to the loaded plate under the action of the static load are calculated respectively. It is proved that the ratio of the amplitude ratio of the unloaded plate to the loaded plate is evaluated. The feasibility of the charge coefficient.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.216;V351.11

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