基于贝叶斯理论的钢管混凝土劲性骨架拱桥收缩徐变效应分析

发布时间：2018-05-02 14:36

本文选题：劲性骨架拱桥 + 收缩徐变　；参考：《铁道标准设计》2017年05期

【摘要】：钢管混凝土劲性骨架拱桥施工程序复杂、施工周期长,导致混凝土收缩徐变效应十分显著,极大地影响桥梁的正常使用性能,严重时甚至威胁结构的安全。同时受收缩徐变不确定性的影响,结构的应力和位移表现出明显的离散性,使桥梁的设计施工工作变得更为困难,结构实际变形偏离其设计值的情况时有发生。为了缓解这种困难,首先改进贝叶斯方法,使其对似然函数分布与先验分布较远的情况同样适用。然后基于此方法,对北盘江大桥模型桥施工期间收缩徐变效应进行分析得到后验预测结果,并通过实测数据进行检验。计算结果表明:基于改进贝叶斯方法得到的后验预测结果与实测数据吻合良好,相较于先验预测结果,数据离散性得到明显改善。
[Abstract]:The concrete filled steel tube rigid skeleton arch bridge has a complex construction procedure and a long construction period, which results in a remarkable shrinkage and creep effect of concrete, which greatly affects the normal service performance of the bridge and even threatens the safety of the structure. At the same time, due to the uncertainty of shrinkage and creep, the stress and displacement of the structure show obvious discreteness, which makes the design and construction of the bridge more difficult, and the actual deformation of the structure deviates from its design value from time to time. In order to alleviate this difficulty, the Bayesian method is improved to make it suitable for the case where the distribution of likelihood function is far away from the prior distribution. Based on this method, the effect of shrinkage and creep during the construction of the model bridge of Beipanjiang Bridge is analyzed to obtain the result of a posterior prediction, and the results are verified by the measured data. The results show that the result of posterior prediction based on the improved Bayesian method is in good agreement with the measured data, and the data dispersion is obviously improved compared with the result of the prior prediction.
【作者单位】：西南交通大学土木工程学院桥梁工程系;
【分类号】：U441;U448.22

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