天津外环线京津塘分离式立交施工风险评价及应用研究

发布时间：2018-01-22 02:48

本文关键词： 立交桥梁工程风险识别风险评价 BP神经网络　出处：《南华大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着国家城镇化的进程和经济发展的需要,桥梁工程在道路工程和市政工程中“扮演”着越来越多的角色,施工企业在项目施工过程中面临着更多的风险。尤其在情况更为复杂的大型市政工程中,立交桥施工过程中所遭遇的风险更难以预测。因此,对此桥梁工程的施工过程进行风险识别及评价研究具有普遍价值。本文在桥梁施工风险国内外现状研究和大量阅读文献的基础上,对立交桥梁施工风险的基本理论进行了详细的分析。首先界定了桥梁施工风险的定义;对风险识别的基本概念进行了介绍,分析了风险识别的特点和基本步骤,为后面对立交桥梁施工的风险识别做好理论铺垫;对风险估计的概念进行了分析,并分别介绍了其中的概率估计和损失估计以及在桥梁施工中的作用;对风险评价的基本理论进行了介绍,其中包括风险评价的基本概念、风险等级的划分、风险的可接受准则和常见风险评价方法的介绍,为后面对立交桥梁施工中的风险评价做好理论基础;分析了桥梁施工中主要的风险类型,主要针对市政工程中的立交桥梁建设进行了风险辨识,得出施工各部分的危险源;然后对风险发生重点部位,即梁身形变的质量控制方面进行风险识别,为后面的风险评价做铺垫;根据评价体系构建原则和工程实例得出了评价节点和神经网络训练模型;对收集的数据进行样本训练,然后输入所需预测的梁段信息并运用BP神经网络进行综合评价,得出评价结果,并做出相应改进。本文根据天津外环线调线工程的京津塘分离式立交建设工程的实际情况,将建立起的风险识别和BP神经网络模型应用于实际工程,对该工程的桥梁上部结构进行预测式的综合评价。并将评价得到的结果与实际工程情况进行对比,以得出工程实际的风险情况。同时也为桥梁线性质量方面风险评价提供了一种新的可行性方法。
[Abstract]:With the process of urbanization and the need of economic development, bridge engineering is playing more and more roles in road engineering and municipal engineering. Construction enterprises are facing more risks in the construction process of the project. Especially in the more complex large-scale municipal projects, the risks encountered in the construction process of the overpass are more difficult to predict. It is of universal value to study the risk identification and evaluation of the bridge construction process. This paper is based on the study of the current situation of the bridge construction risk at home and abroad and a large number of reading documents. The basic theory of bridge construction risk is analyzed in detail. Firstly, the definition of bridge construction risk is defined. The basic concept of risk identification is introduced and the characteristics and basic steps of risk identification are analyzed. The concept of risk estimation is analyzed, and the probabilistic estimation and loss estimation, as well as their roles in bridge construction, are introduced respectively. The basic theory of risk evaluation is introduced, including the basic concept of risk evaluation, the classification of risk grade, the acceptable criteria of risk and the introduction of common risk evaluation methods. It is the theoretical basis for the risk assessment in the construction of the interchange bridge. The main risk types in the bridge construction are analyzed, and the risk identification of the interchange bridge construction in the municipal engineering is carried out, and the dangerous source of each part of the construction is obtained. Then risk identification is carried out on the key part of risk occurrence, that is, the quality control of beam shape change, so as to pave the way for the risk evaluation in the future. According to the construction principle of evaluation system and engineering examples, the training model of evaluation node and neural network is obtained. The collected data is trained by sample, and then the information of the beam segment is input and the BP neural network is used for comprehensive evaluation, and the evaluation results are obtained. According to the actual situation of the Beijing-Tianjin-Tangshan separation interchange construction project, the risk identification and BP neural network model are applied to the actual project. A comprehensive evaluation of the bridge superstructure of the project is carried out, and the results obtained are compared with the actual engineering situation. At the same time, it provides a new feasible method for bridge linear quality risk evaluation.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.1

【相似文献】