基于灰色理论的PC连续刚构桥线形控制研究
发布时间：2019-03-13 16:03
【摘要】：为了使PC连续刚构桥的内力、位置等情况尽可能的与设计值吻合,必须在桥梁施工时对其进行准确合理的线形控制。桥梁的线形控制中最重要的就是桥梁预拱度的设置问题。本文简要阐述桥梁线形控制的相关理论,以及线形控制中预测预拱度的方法,着重研究用灰色理论预测模型作为预拱度预测的方法。在原有灰色理论预测模型法基础上,提出一种修改原模型中背景值与紧邻均值的新预测模型,通过对几组数据的对比研究证明其具有更高的预测精度。最后,结合某大型PC连续刚构桥实例,通过运用有限元软件MIDAS/CIVIL建立刚构桥模型,并将70~73四个节点预拱度的理论设计值与施工测量值的比值作为原始数据代入新预测模型,再将预测的下一节段预拱度的数值与实际测量值进行比对,结果证明:改进的灰色理论预测模型在桥梁预拱度的预测上,满足施工精度的要求,可以用来指导桥梁的线形施工问题。
[Abstract]:In order to make the internal force and position of PC continuous rigid frame bridge coincide with the designed value as much as possible, it is necessary to carry out accurate and reasonable linear control during the construction of the bridge. The most important problem in the linear control of bridge is the setting of bridge pre-camber. In this paper, the relevant theory of bridge alignment control and the prediction method of pre-camber in linear control are briefly described, and the grey theory prediction model is emphatically studied as the prediction method of pre-camber. On the basis of the original grey theory prediction model, a new prediction model is proposed, which modifies the background value and the close neighbor mean value in the original model. The comparison of several sets of data proves that it has higher prediction accuracy. Finally, combined with an example of a large-scale PC continuous rigid frame bridge, the rigid frame bridge model is established by using the finite element software MIDAS/CIVIL, and the ratio of the theoretical design value to the construction measurement value of the pre-camber of the four nodes 70m 73 is taken as the original data into the new prediction model. Then the predicted pre-camber value of the next segment is compared with the actual measured value. The results show that the improved grey theory prediction model meets the requirements of construction accuracy in the prediction of the bridge pre-camber, and the results show that the improved grey theory prediction model can meet the requirements of the construction accuracy. It can be used to guide the linear construction of bridges.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.23
本文编号：2439544
[Abstract]:In order to make the internal force and position of PC continuous rigid frame bridge coincide with the designed value as much as possible, it is necessary to carry out accurate and reasonable linear control during the construction of the bridge. The most important problem in the linear control of bridge is the setting of bridge pre-camber. In this paper, the relevant theory of bridge alignment control and the prediction method of pre-camber in linear control are briefly described, and the grey theory prediction model is emphatically studied as the prediction method of pre-camber. On the basis of the original grey theory prediction model, a new prediction model is proposed, which modifies the background value and the close neighbor mean value in the original model. The comparison of several sets of data proves that it has higher prediction accuracy. Finally, combined with an example of a large-scale PC continuous rigid frame bridge, the rigid frame bridge model is established by using the finite element software MIDAS/CIVIL, and the ratio of the theoretical design value to the construction measurement value of the pre-camber of the four nodes 70m 73 is taken as the original data into the new prediction model. Then the predicted pre-camber value of the next segment is compared with the actual measured value. The results show that the improved grey theory prediction model meets the requirements of construction accuracy in the prediction of the bridge pre-camber, and the results show that the improved grey theory prediction model can meet the requirements of the construction accuracy. It can be used to guide the linear construction of bridges.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.23
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