The large - span pc continuous bridge is one of the popular types of modern bridges . in recent years , there are a lot of examples of this kind of bridge deteriorations , which made the research on those very important 大跨pc连续梁是目前修建较多的桥梁型式之一,近年来,有不少大跨pc连续梁产生病害的例子,对该类桥梁病害的评估及加固方法的研究是十分必要的。
With the development of science and technology and traffic enterprise , the prestressed concrete continuous bridge has been growing up rapidly in recent 20 years with it ' s unique predominance of handy construction , economical cost , reasonable internal force and comfortable traveling . it almost has become the first selective bridge style when the main span is in the range from 100m to 300m 随着科学技术和交通事业的发展,预应力混凝土连续梁桥以其施工简便、造价经济、受力合理、行车舒适等独特优势在近年来得到了迅速发展,在主跨100 300m范围内几乎成为首选桥型。
In this thesis , aim to the beam axis shape be exactitude for design , the internal force of the beam be appeased by design request , the concept of modem cybernetics is applied , at the same time , the effecting parameter has collected . the paper build the ann model in predicting the beam camber an construction and discuss indetail the extraction of inputting nodes information when quoting the fundamental principle of ann model and introducing research process of the improved bnn . according to them , ann is applied in the construction control of prestressed concrete continuous bridge 本文以大桥成桥线形满足设计要求和成桥内力控制在设计容许范围内为目的,运用现代控制理论的思想,引用神经网络基本原理,详细介绍bp神经网络的研究过程,从而建立预应力混凝土连续梁桥施工预拱度的神经网络模型,并详细讨论了模型的神经网络结点信息的提取,在工程实例的基础上进行了数值计武汉理工大学硕士学位论文算,数值表明,将神经网络应用于预应力混凝土连续梁桥施工控制,获得了满意的结果,在预应力混凝土连续梁桥施工控制技术研究方面,具有方便有效、精度高的优点,具有良好的应用前景。
In this paper , a two - dimensional analysis of the tanjialiangzi bridge was first performed ; then a segment of the bridge was modeled and a three - dimensional analysis of it were carried out by employing the fem software of ansys ; after a careful analysis of the result of the calculations , the causes of the diagonal cracking in the web of the beam were given out ; and also , in the last part , common steps of damage evaluation of the long - span pc continuous bridges through fem software were summarized 本文首先对谭家梁子大桥作平面计算分析;然后运用ansys软件建立该桥局部梁段的空间有限元模型,并在此基础上进行空间局部有限元分析;通过对计算结果的整理和分析,从设计方面探讨了该桥腹板斜裂缝产生的原因:此后,针对病害成因,本文提出了裂缝修补和腹板加固的方法;最后总结了运用有限元软件分析同类桥梁病害的一般方法。