河床下切引起的桩柱式桥墩病害加固研究

发布时间：2018-06-19 20:26

本文选题：河床下切 + 桩柱式桥墩　；参考：《华中科技大学》2014年硕士论文

【摘要】：随着河床下切导致桥梁垮塌事故的频繁发生，河床下切引起的桥梁病害加固研究越来越引起人们的高度重视。本文针对目前河床下切引起的桩柱式桥墩病害加固研究方向和研究工作的不足，，依托实际工程主要在河床下切引起的桩柱式桥墩病害加固改造方法以及加固参数优化方面展开了研究。本文的主要研究内容如下：以课题组近些年来加固的一些工程实例为基础，总结了河床下切引起的桩柱式桥墩常见病害并对其成因进行了分析，阐述了河床下切后桩柱式桥墩屈曲失稳定义以及桩柱式桥墩屈曲的几个主要影响因素，并简要归纳了河床下切引起的桩柱式桥墩病害的常用加固改造方法。结合工程实例，针对课题组提出并采用的加固改造方法，探讨其加固措施和加固机理，并运用midas civil软件对河床下切前、河床下切后加固前、加固后及远期河床下切四种状态进行数值分析，以证明这些加固方法的有效性和远期的可靠性。运用控制变量法，分别选取不同的加固参数作为变量，在控制其他因素都相同的条件下，选取桥墩上各点的水平位移作为优化指标。分别建立模型进行计算，对比分析计算结果，总结出合理的加强桩桩径及桩间距，并提出了控制桩柱式桥墩水平位移的方法。
[Abstract]:With the frequent occurrence of bridge collapse caused by river bed cutting, people pay more and more attention to the bridge disease reinforcement caused by river bed cutting. This paper aims at the deficiency of the research direction and research work of the pile-column pier disease reinforcement caused by the river bed cutting at present. Based on the practical engineering, the method of strengthening and improving the disease of pile-column pier and the optimization of reinforcement parameters caused by the cutting of river bed are studied. The main contents of this paper are as follows: based on some engineering examples of reinforcement in recent years, the common diseases of pile-column pier caused by river bed cutting are summarized and the causes of formation are analyzed. This paper expounds the definition of buckling instability of pile-column pier after river bed cutting and several main influencing factors of pile-column pier buckling, and briefly summarizes the commonly used reinforcement methods of pile-column pier diseases caused by river bed down-cutting. Combined with engineering examples, this paper discusses the reinforcement measures and reinforcement mechanism of the reinforcement methods proposed and adopted by the research group, and uses midas civil software to cut the river bed before and after the river bed cutting and strengthening. In order to prove the effectiveness and long-term reliability of these reinforcement methods, the four states of river bed are analyzed numerically after reinforcement and long-term river bed cutting. By using the control variable method, different reinforcement parameters are selected as variables, and the horizontal displacement of each point on the pier is chosen as the optimization index under the same conditions of controlling other factors. The model is established to calculate, and the results are compared and analyzed. The reasonable strengthening pile diameter and pile spacing are summarized, and the method to control the horizontal displacement of pile-type bridge pier is put forward.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.7

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