基于实测数据模拟的随机车载作用下桥梁振动响应分析

发布时间：2018-05-15 01:06

本文选题：随机车辆荷载 + CA模型　；参考：《江西理工大学》2017年硕士论文

【摘要】：在全国经济飞速增长的环境下,工业化发展程度的不同致使各地运输行业存在显著区别。工业化程度较高的地区,其运输荷载较大,则可能会导致桥梁承受的荷载大于规范设计值。因此本文结合国家自然基金(编号:51278134)、江西省交通运输厅科技项目(编号:2014Y0012)及江西省教育厅项目(编号:2016GJJ160620)的研究,通过对两个工业化程度明显不同的粤赣地区某段高速公路实测车辆荷载数据进行分析,研究的主要内容如下:(1)基于工业发达程度不同的粤赣两地实测车辆荷载数据,对其进行统计分析得出各个车型所占比例以及各车型车重概率分布,根据实测数据建立了基于CA理论的模型。利用实测车辆荷载信息,在MATLAB程序环境下编制了涵盖车辆速度、重量、换道以及车型等参数的CA仿真模拟程序,在仿真模拟过程中发现出现较多超载车辆的广韶高速路面在同等运行状态下,路面总荷载大于赣定高速模拟结果,且广韶行车道与超车道荷载分布不均。(2)对目前现有的车致振动理论对比分析,计算了不同模型荷载作用在简支梁上引起的跨中位移,模拟结果显示,集中力和移动质量作用结果十分接近,而加入弹簧的移动质量模型则可以起到减振的作用,且在一定刚度范围内,刚度越小减振效果越明显。并提出了将CA仿真模拟程序产生的随机荷载应用到ANSYS模型下桥梁之上的实现方案。(3)以几种典型的连续刚构桥为例,利用本文提出的车致振动方法进行分析得到,随机荷载作用下桥梁跨中位移冲击系数较为接近规范冲击系数;货车拥堵运行状态下相比较于其他几种运行状态,有较大概率使桥梁产生较大跨中位移;限载对公路桥梁起到了极大的保护作用,桥梁跨中限载后产生的位移均值只有限载前的1/2;桥梁的抗弯刚度增加并不会迅速降低由随机荷载对桥面冲击造成的跨中位移值大小,但是降低桥梁抗弯刚度会使桥梁在随机荷载作用下的跨中位移值迅速增大;在增加TMD减振措施下,桥梁减振效果明显,在一定阻尼比范围内,随着阻尼比的加大,减振效果逐步加强。
[Abstract]:In the environment of rapid economic growth, the different degree of industrialization leads to significant differences in transportation industry. In the areas with high industrialization, the load of the bridge may be larger than the design value of the code. Therefore, this paper combines the research of the National Natural Fund (No.: 51278134N), the Science and Technology Project of Jiangxi Provincial Traffic and Transport Department (No.: 2014Y0012) and the Project of Jiangxi Provincial Education Department (No.: 2016GJJ160620). Based on the analysis of the measured vehicle load data of two expressway sections in Guangdong and Jiangxi provinces with different industrialization, the main contents of the study are as follows: (1) based on the measured vehicle load data of Guangdong and Jiangxi provinces with different degree of industrial development, The proportion of each vehicle type and the probability distribution of vehicle weight are obtained by statistical analysis, and the model based on CA theory is established according to the measured data. Based on the measured vehicle load information, a CA simulation program covering the parameters of vehicle speed, weight, change of track and vehicle type is developed under the environment of MATLAB program. In the course of simulation, it is found that the total load of Guangshao high speed pavement with more overloaded vehicles is larger than that of Ganding high-speed road under the same running condition. Moreover, the load distribution of Guangshao carriageway and overtaking track is uneven. Compared with the existing vehicle-induced vibration theory, the mid-span displacement caused by different model loads on simply supported beams is calculated. The simulation results show that, The results of concentrated force and moving mass are very close, but the moving mass model with spring can reduce vibration, and the smaller the stiffness is, the more obvious the damping effect is. The realization scheme of applying the random load generated by the CA simulation program to the bridge under the ANSYS model is put forward. Taking several typical continuous rigid frame bridges as an example, the vehicle induced vibration method proposed in this paper is used to obtain the results. The impact coefficient of mid-span displacement of bridge under random load is close to the standard impact coefficient, compared with the other running states, there is a greater probability that the bridge will produce larger mid-span displacement under the condition of truck congestion. The limited load has a great protective effect on the highway bridge. The average displacement produced by the bridge span after the mid-load limit is only 1 / 2 of that before the limited load, and the increase of the flexural stiffness of the bridge will not rapidly reduce the magnitude of the mid-span displacement caused by the impact of random loads on the bridge deck. However, reducing the flexural stiffness of the bridge will make the displacement of the bridge under random load increase rapidly. With the increase of TMD, the damping effect of the bridge is obvious, and in a certain range of damping ratio, the damping ratio increases with the increase of the damping ratio. The damping effect is gradually strengthened.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3

【参考文献】