公路预应力混凝土桥梁承载力的施工可靠性分析与参数控制

发布时间：2018-01-15 22:08

本文关键词：公路预应力混凝土桥梁承载力的施工可靠性分析与参数控制　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：在预应力混凝土桥梁工程建设过程中,质量是工程的关键内容。工程出现质量问题,会给工程带来严重的后果,直接影响到桥梁的使用功能,因此有必要对桥梁的施工质量做出综合评价。《公路工程质量检验评定标准》对桥梁施工质量采用加权打分算法,但这种方法没有充分考虑到施工过程中的随机性。本文在考虑随机性的基础上,研究了预应力混凝土梁承载力的施工可靠性,并根据质量控制理论提出了预应力混凝土梁的施工过程参数控制。主要的工作内容如下： (1)本文对预制预应力混凝土T梁的施工材料和预应力张拉水平进行了调查,并采用数理统计方法对上述随机变量分布进行拟合并获取了相关随机变量的统计参数。然后运用贝叶斯更新方法将现场观测数据的统计参数和经验统计结果进行综合,得到统计量数值。 (2)利用改进一次二阶矩法(验算点法)对上述施工可靠性进行编程计算,得出承载力的施工可靠性,并利用蒙特卡洛算法对上述结果进行了验证。计算结果表明：预应力混凝土梁承载力的施工可靠度指标为4.04,通过对工程项目的数值模拟,4000片梁的承载力均能达到设计要求。 (3)对影响承载力施工可靠性的因素进行参数分析,辨别施工可靠性对上述随机变量的敏感程度,并基于此提出与目标施工可靠性相匹配的质量控制要求(参数控制)。引用质量控制理论中的控制图方法对混凝土强度、钢绞线的张拉水平的均值和标准差进行监控。
[Abstract]:In the process of prestressed concrete bridge construction, the quality is the key content of the project. The quality problems in the project will bring serious consequences to the project, and directly affect the use of the bridge function. Therefore, it is necessary to make a comprehensive evaluation of the construction quality of the bridge. However, this method does not fully consider the randomness of the construction process. On the basis of considering randomness, this paper studies the construction reliability of prestressed concrete beam bearing capacity. According to the theory of quality control, the parameter control of the construction process of prestressed concrete beam is put forward. The main work contents are as follows: In this paper, the construction materials and prestressing tensioning level of prefabricated prestressed concrete T-beams are investigated. The statistical parameters of the related random variables are obtained by using mathematical statistical method, and the statistical parameters of the field observation data and the empirical statistical results are obtained by using Bayesian updating method. Synthesis. The statistical value is obtained. 2) using the improved first order second order moment method (check point method) to program and calculate the above construction reliability, and to obtain the construction reliability of bearing capacity. Monte Carlo algorithm is used to verify the above results. The calculation results show that the construction reliability index of prestressed concrete beam is 4.04, through the numerical simulation of the project. The bearing capacity of 4000 beams can meet the design requirements. 3) the factors affecting the reliability of the construction are analyzed, and the sensitivity of the reliability to the above random variables is identified. Based on this, the quality control requirements matching with the reliability of the target construction are put forward (parameter control). The control chart method in the quality control theory is used for the strength of concrete. The mean and standard deviation of the tensioning level of the steel strands are monitored.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.35;U445

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