不同参数下连续刚构桥地震响应研究
发布时间：2018-10-31 13:22
【摘要】：预应力混凝土连续刚构桥具有整体性好、跨越能力大、受力合理、造价适宜、施工技术娴熟、行车平顺、外形优美等优点。连续刚构桥通常被应用在主跨在100m至250m范围左右的高墩大跨结构形式之中。但是目前连续刚构桥梁在抗震设计中主要采用偏于保守的经验来设计然后用计算来验证,而且对于一些设计缺陷也没有引起足够的重视,所以对不同参数的连续刚构桥进行动力响应研究是十分有必要的。论文以实际工程中的一座高墩大跨预应力混凝土连续刚构桥为背景,选取了上部结构参数中的边中跨比、梁底抛物线次数、0号块梁高、跨中梁高以及下部结构中的横系梁根数作为优化变量。分别考虑上部参数对桥梁地震响应影响、横系梁对桥梁地震响应的影响以及上下部结构参数同时考虑对桥梁地震响应影响进行了正交试验分析,主要完成的工作如下:(1)介绍了常用桥梁的主要震害,中国以及日本抗震规范的发展历程,国内外专家学者对桥梁抗震研究的现状,对桥梁抗震分析方法以及优化方法进行了简单的介绍。(2)对目前国内外部分已建成的连续刚构桥的参数进行归纳整理,得出了相应的使用范围,并根据所选用的工程背景的地震设防等级,选取多个不同的目标函数。首先只考虑上部结构参数时,建立了 25个参数各异的正交模型,地震波选用相同“纵向+横向+纵向”组合。针对各个不同优化目标,在弹性状态和弹塑性状态下寻找出各自的最优参数组合;通过极差分析以及方差分析,找出各个参数对桥梁抗震的影响效果。(3)只考虑下部结构参数中的横系梁根数,建立不同的模型,地震波选用相同“纵向+横向+纵向”组合。分析了结构在弹性状态下和弹塑性状态下,针对不同的目标函数寻出最后的横系梁根数。(4)将上部参数和横系梁根数统一起来作为结构参数考虑,建立了 25个参数正交各异的模型,地震波选用相同“纵向+横向+纵向”组合。针对选取的各个不同目标,寻找出其在塑性阶段的最优参数组合。通过极差分析,找出各参数对桥梁抗震的影响效果。
[Abstract]:Prestressed concrete continuous rigid frame bridge has the advantages of good integrity, large span capacity, reasonable force, suitable cost, skillful construction technology, smooth running and beautiful appearance. Continuous rigid frame bridge is usually used in the structure of high pier and large span with the main span between 100m and 250m. However, at present, the continuous rigid frame bridges are mainly designed by conservative experience in seismic design and then verified by calculation, and some design defects are not paid enough attention to. So it is necessary to study the dynamic response of continuous rigid frame bridge with different parameters. In this paper, a prestressed concrete continuous rigid frame bridge with high piers and long spans is used as the background. The ratio of side to middle span, the number of parabola at the bottom of beam, and the height of block 0 beam are selected. The height of mid-span beam and the root number of transverse beam in the substructure are taken as optimization variables. The influence of upper parameters on bridge seismic response, the influence of transverse beam on bridge seismic response and the influence of upper and lower structural parameters on bridge seismic response are considered respectively. The main works are as follows: (1) the main earthquake damage of common bridges, the development of seismic codes in China and Japan, and the current situation of seismic research on bridges by experts and scholars at home and abroad are introduced. The aseismic analysis methods and optimization methods of bridges are introduced briefly. (2) the parameters of continuous rigid frame bridges which have been built at home and abroad are summarized and arranged, and the corresponding application scope is obtained. Several different objective functions are selected according to the earthquake fortification level of the engineering background. First, 25 orthogonal models with different parameters are established when the superstructure parameters are only considered, and the seismic wave is composed of the same longitudinal and transverse direction. According to different optimization targets, the optimal parameter combination is found in elastic state and elastic-plastic state. By means of range analysis and variance analysis, the effect of each parameter on seismic resistance of bridge is found out. (3) considering only the root number of transverse beam in substructure parameters, different models are established. The seismic wave is composed of the same "longitudinal transverse longitudinal" combination. In this paper, the final root number of transverse beam is found for different objective functions in elastic state and elastic-plastic state. (4) the upper parameter and the root number of transverse beam are unified as structural parameters. In this paper, 25 models with different orthogonal parameters are established, and the seismic waves are composed of the same "longitudinal and transverse longitudinal". The optimal combination of parameters in plastic stage is found for different targets. By means of range analysis, the effect of each parameter on bridge seismic resistance is found out.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.23
[Abstract]:Prestressed concrete continuous rigid frame bridge has the advantages of good integrity, large span capacity, reasonable force, suitable cost, skillful construction technology, smooth running and beautiful appearance. Continuous rigid frame bridge is usually used in the structure of high pier and large span with the main span between 100m and 250m. However, at present, the continuous rigid frame bridges are mainly designed by conservative experience in seismic design and then verified by calculation, and some design defects are not paid enough attention to. So it is necessary to study the dynamic response of continuous rigid frame bridge with different parameters. In this paper, a prestressed concrete continuous rigid frame bridge with high piers and long spans is used as the background. The ratio of side to middle span, the number of parabola at the bottom of beam, and the height of block 0 beam are selected. The height of mid-span beam and the root number of transverse beam in the substructure are taken as optimization variables. The influence of upper parameters on bridge seismic response, the influence of transverse beam on bridge seismic response and the influence of upper and lower structural parameters on bridge seismic response are considered respectively. The main works are as follows: (1) the main earthquake damage of common bridges, the development of seismic codes in China and Japan, and the current situation of seismic research on bridges by experts and scholars at home and abroad are introduced. The aseismic analysis methods and optimization methods of bridges are introduced briefly. (2) the parameters of continuous rigid frame bridges which have been built at home and abroad are summarized and arranged, and the corresponding application scope is obtained. Several different objective functions are selected according to the earthquake fortification level of the engineering background. First, 25 orthogonal models with different parameters are established when the superstructure parameters are only considered, and the seismic wave is composed of the same longitudinal and transverse direction. According to different optimization targets, the optimal parameter combination is found in elastic state and elastic-plastic state. By means of range analysis and variance analysis, the effect of each parameter on seismic resistance of bridge is found out. (3) considering only the root number of transverse beam in substructure parameters, different models are established. The seismic wave is composed of the same "longitudinal transverse longitudinal" combination. In this paper, the final root number of transverse beam is found for different objective functions in elastic state and elastic-plastic state. (4) the upper parameter and the root number of transverse beam are unified as structural parameters. In this paper, 25 models with different orthogonal parameters are established, and the seismic waves are composed of the same "longitudinal and transverse longitudinal". The optimal combination of parameters in plastic stage is found for different targets. By means of range analysis, the effect of each parameter on bridge seismic resistance is found out.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.23
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