基于响应面法的曲线连续刚构桥可靠度分析

发布时间：2018-02-03 23:26

  本文关键词： 曲线连续刚构桥 施工期可靠度 响应面法 施工监控　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：曲线连续刚构桥以其能够适应公路路线,外形美观等优势得到广泛的应用,同时由于有许多不确定因素的干扰,造成结构内力和变形不断发生变化,因此在施工过程中必须进行施工监控。从可靠度理论出发,对曲线连续刚构桥的侧向位移施工期可靠度进行分析,从而得到不同的施工阶段的侧向位移变化误差允许值。而在可靠性参数灵敏度的结果分析中可以判断出对结构影响比较大的因素,为施工监控提供理论依据。本文以古蔺河1号特大桥为背景,主要工作成果如下：建立了古蔺河1号特大桥有限元模型,运用响应面法得到隐性的功能函数,从而对桥梁侧向位移的施工期可靠度进行分析。分析结果表明,在不同施工阶段,侧向位移变化允许值取不同数值时,计算得到古蔺河1号特大桥在各工况施工时主梁关键截面侧向位移的可靠度和失效概率,从而能给出该施工阶段的允许误差,当实测侧向位移误差超过误差允许值时,说明施工质量或施工监测存在问题,应该加强质量控制。研究了影响因素的可靠性参数灵敏度。分析结果表明,各参数对曲线连续刚构桥侧向位移的影响大小依次为：混凝土容重、预应力张拉值、混凝土弹性模量和钢绞线弹性模量,参数灵敏度分析结果对参数识别和线型控制均有较大的参考价值。
[Abstract]:Curved continuous rigid frame bridge has been widely used because of its advantages such as being able to adapt to highway route, beautiful appearance and so on. At the same time, due to the interference of many uncertain factors, the internal force and deformation of the structure are constantly changing. Therefore, the construction monitoring must be carried out during the construction process. Based on the reliability theory, the reliability of the curved continuous rigid frame bridge during the construction period is analyzed. Thus the allowable values of lateral displacement variation errors in different construction stages can be obtained, and the factors which have great influence on the structure can be judged in the result analysis of reliability parameter sensitivity. The main results are as follows: the finite element model of Gulin River No. 1 Bridge is established, and the implicit function function is obtained by using response surface method. The reliability of bridge lateral displacement during construction period is analyzed. The results show that the allowable values of lateral displacement change are different in different construction stages. The reliability and failure probability of the lateral displacement of the key section of the main beam during the construction of Gulin River No. 1 Bridge are calculated, and the allowable errors in the construction stage can be given. When the measured lateral displacement error exceeds the allowable value of the error, it is shown that there are problems in construction quality or construction monitoring, and quality control should be strengthened. The reliability parameter sensitivity of the influencing factors is studied. The influence of each parameter on lateral displacement of curved continuous rigid frame bridge is as follows: bulk density of concrete, prestress tensioning value, elastic modulus of concrete and elastic modulus of steel strand. The results of parameter sensitivity analysis are of great reference value for parameter identification and linear control.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.23
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本文编号：1488643