【作者】 侯旋；

【导师】 贺拴海；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 目前,国内外对于既有钢筋混凝土梁桥的可靠度研究较多,可靠度分析理论也比较完善,但关于钢筋混凝土梁桥加固后可靠度的研究和资料较少,对于加固后桥梁动态可靠度的研究尚未见诸报道。本文就此展开研究,具有重要的工程应用价值。本文首先阐述了钢筋混凝土桥梁可靠度分析的现状及存在问题,并以基于可靠度理论的桥梁可靠性评估方法作为重点,详细论述了可靠度理论的基本原理及计算可靠指标的基本方法：JC法和蒙特卡洛法。其次,针对抗力衰减的问题,本文在混凝土结构耐久性研究的基础上,建立了钢筋混凝土梁桥的抗力衰减模型,并推导了梁桥采用钢板加固法前后抗力参数的计算公式。基于对钢筋混凝土桥梁的荷载效应及抗力的模型的建立和对可靠度理论和动态可靠度理论充分理解的基础上,应用Matlab语言编写出钢筋混凝土桥梁加固后的动态可靠指标计算程序。最后,通过实际工程示例,利用编写好的计算动态可靠指标的Matlab程序计算桥梁加固后的动态可靠指标。分析时采用JC法和蒙特卡洛法两种方法进行计算并相互校核了计算结果,并分析了恒荷载变异系数、活荷载变异系数、钢板厚度等参数对加固后桥梁动态可靠指标的影响,得出了部分参数对加固后构件可靠指标的变化规律。更多还原

【Abstract】 At present, domestic and foreign regarding already has the reinforced concrete beam-bridge reliability research to be many, reliability analysis theory is also quite perfect, but after reinforced concrete beam-bridge strengthened reliability research and the material are few, there have not been reported the studies which calculate dynamic reliability of reinforced bridge. Therefore, it is very essential to the reinforced concrete beam-bridge strengthened reliability carries on the analysis computation.In this article, firstly, introduced the reliability analysis of reinforced concrete bridge, the status quo and existing problems. And the method based upon reliability theory is the emphasis. The basic principles of reliability theory and the basic calculation methods of reliability index:JC method and Monte Carlo method are detailed introduced.Secondly, in the aspect of resistance degradation, based on the studies of concrete durability by the predecessors, one resisting force model is established, and the calculation formulas of the resistance parameters are deduced. Based upon the model establishment of the resistance and the load effect, and the comprehending of the reliability theory, one program used to calculate the time-dependent index of the bending member is compiled by MATLAB language.At last, through the practical engineering examples, with compiled MATLAB procedure which calculate dynamic reliability index, calculated reinforced bridge dynamic reliability index. When analyzing, used JC method and Monte Carlo method to calculate, and checked mutually the calculation results. Meanwhile, analyzed the parameters’influence for reinforced bridge dynamic reliability index, which constant load coefficient variation, Live load coefficient variation and the thickness of the steel plate, obtained relevant variation discipline.更多还原