提高基于拱桥静动载试验评测结果客观性的分析研究

发布时间：2018-05-24 14:13

本文选题：拱桥 + 冲击系数　；参考：《重庆交通大学》2016年硕士论文

【摘要】：混凝土拱桥以其结构美观、承载力潜力大等特点在重庆等山区省份的公路、城市交通中应用十分广泛,保有量巨大,因此准确测定混凝土拱桥在试验荷载作用下的力学性能指标,客观评价结构性能,对保证桥梁的安全营运和功能维持具有重要的意义。但是这种方法在对拱桥结构评测结果的客观性上仍然存在诸多不足的地方,本文主要采用理论研究、建模和统计分析的方法对拱桥的动静载试验做了如下几方面的探讨和分析:1.本文对影响混凝土拱桥校验系数的因素进行了系统分析和探讨,通过数值计算定量分析了因温度变化产生畸变的规律,结果表明实测量值越小,结构安全储备越大,评价客观性反而越差。2.本文对拱桥加载方法进行了优化,其中包括通过采用数值计算对小跨径桥梁荷载形式的选取进行探讨,发现了桥跨径小于50m的时候四种控制荷载计算结果有一定的差异。3.对大跨度拱桥的测量方法进行了比较分析和误差定量计算,提出了大跨度拱桥挠度测量的合理方法和建议。4.目前在利用主拱圈线形对结构性能进行评价的针对性不强,本论文通过典型结构的异常线形建立有限元模型、数值分析,提出了利用拱圈线形直观评价结构受力性能的合理化建议。5.基于样本分析统计,对混凝土拱桥冲击系数进行回归分析,并对04规范中关于冲击系数计算结果的客观性进行分析和探讨。
[Abstract]:Concrete arch bridges are widely used in urban traffic in mountainous provinces such as Chongqing because of their beautiful structure and great bearing capacity potential. Therefore, it is of great significance to measure the mechanical performance of concrete arch bridge under test load and to evaluate the structure performance objectively for ensuring the safe operation and function maintenance of the bridge. However, this method still has many shortcomings in the objectivity of the evaluation results of arch bridge structure. This paper mainly uses the methods of theoretical research, modeling and statistical analysis to discuss and analyze the dynamic and static load test of arch bridge in the following aspects: 1. In this paper, the factors influencing the check coefficient of concrete arch bridge are systematically analyzed and discussed, and the law of distortion caused by temperature change is quantitatively analyzed by numerical calculation. The results show that the smaller the measured value is, the greater the safety reserve of the structure is. On the contrary, the objectivity of evaluation is worse. In this paper, the loading method of arch bridge is optimized, including the selection of load form of small span bridge by numerical calculation. It is found that there are some differences in calculation results of four kinds of control loads when span is less than 50 m. The measurement methods of long-span arch bridge are compared and calculated quantitatively, and the reasonable method and suggestion of deflection measurement of long-span arch bridge are put forward. At present, the performance of the structure is not evaluated by the main arch ring alignment. In this paper, the finite element model is established through the abnormal alignment of the typical structure, and the numerical analysis is carried out. The rational suggestion of using arch ring linear shape to evaluate the mechanical performance of structure is put forward. Based on the sample analysis and statistics, the impact coefficient of concrete arch bridge is analyzed by regression analysis, and the objectivity of the calculation result of impact coefficient in Code 04 is analyzed and discussed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U446.1;U448.22

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