多跨双曲拱桥的荷载试验研究

发布时间：2018-01-11 14:20

本文关键词：多跨双曲拱桥的荷载试验研究　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：在我国公路桥梁中,拱桥是一种跨越能力大,承载能力高,并且取材方便,造价经济的古老桥型。因为历史悠久,造型美观,拱桥积累了很多的技术优势,具备很强的竞争力,也因此早我国造桥史上得到了大量普及。具备我国在传统拱桥的基础上,创新性的建造出了双曲拱桥这种具有良好受力性能的新式拱桥桥型,并在之后我国桥梁的建设中得到了广泛的应用。改革开放以来,我国的经济建设取得了长足的进步,伴随着交通量以及超重车辆的迅速增加,已建拱桥的病害及承载能力问题也日益突出。为了更好地实现这些桥梁的服务功能,我们需要对桥梁进行必要的检测与评定,对桥梁实施荷载试验就是对其检测评定的一种重要手段。首先,根据相关规范以及桥梁的荷载等级并结合相关检测结果,采用桥梁专用计算软件Doctor Bridge建立有限元模型,并通过各项技术指标来对桥梁进行承载能力评估计算。在评估结果能够满足规范的承载力要求后,再通过有限元分析软件Midas/Civil建立多跨双曲拱的有限元模型,根据桥型的受力及内力计算特点来确定好加载和控制断面,加卸载的分级、终止实验条件、测试内容、方法、测点布置、仪器选配、数据处理、曲线绘制等。通过静载试验,得出各加载工况各测点的应变,挠度,再与理论计算值进行对比分析,检验桥梁的实际承载能力是否满足设计或者现今交通量下的承载能力要求。动载试验中,对桥梁的激励方式,我们采取的跑车与跳车试验。在桥梁结构的振动过程中,通过对桥梁特定部位的动力时程响应的采集,整理分析出其动力参数。同时在已经建立并计算好的有限元模型中,通过提取相应的理论数据域试验值对比,由此来对桥梁结构的使用状态进行评价。
[Abstract]:In our country highway bridge, arch bridge is a kind of old bridge with large span capacity, high bearing capacity, convenient material selection and economical cost. Because of its long history, beautiful shape, arch bridge has accumulated a lot of technical advantages. Have very strong competitiveness, but also early in the history of bridge construction in China has been a large number of popularization, with our country on the basis of traditional arch bridge. Innovative construction of hyperbolic arch bridge, a new type of arch bridge with good mechanical performance, and has been widely used in the construction of bridges in China. Since the reform and opening up. China's economic construction has made considerable progress, with the rapid increase in traffic volume and overweight vehicles. In order to better realize the service function of these bridges, we need to carry out the necessary detection and evaluation of the bridges. Load test is an important means to test and evaluate the bridge. Firstly, according to the relevant specifications and the load grade of the bridge, combined with the relevant test results. The finite element model is established by Doctor Bridge. And through each technical index to evaluate the bearing capacity of the bridge, after the evaluation results can meet the requirements of the bearing capacity of the code. Then the finite element model of multi-span hyperbolic arch is established by the finite element analysis software Midas/Civil. According to the calculation characteristics of the bridge force and internal force, the loading and controlling section and the loading and unloading classification are determined. The test conditions, test contents, methods, measuring points layout, instrument selection, data processing, curve drawing, etc. Through static load test, the strain and deflection of each measuring point under loading conditions are obtained. And then compared with the theoretical calculation value to verify whether the actual bearing capacity of the bridge meets the requirements of the design or the current traffic capacity. Dynamic load test, the excitation mode of the bridge. In the vibration process of the bridge structure, the dynamic time-history response of the specific part of the bridge is collected. At the same time, in the finite element model which has been established and calculated, the use state of the bridge structure is evaluated by extracting the corresponding theoretical data domain test data and comparing the test data.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.22;U441.2

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