混合梁斜拉桥辅助墩和结合段参数优化设计研究
发布时间：2018-11-23 11:32
【摘要】：随着我国一大批超大跨径桥梁的建成,我国正从桥梁大国向桥梁强国迈进。要想真正的实现桥梁强国的梦想,必须从大跨度桥梁的基本科研工作入手,大跨度混合梁斜拉桥的辅助墩以及结合段的科研工作就是其中一部分。大跨度斜拉桥辅助墩的设置使边跨主梁的内力分布有明显改善,而辅助墩位置以及数量的不同,对主梁内力的改善程度不同;结合段位置直接决定了不同材料主梁的长度比,也就决定了主梁自重分布情况,对主梁内力分布影响明显。因此,辅助墩位置、数量以及结合段位置最佳组合的确定对大跨度混合梁斜拉桥的设计有着很大影响,具有研究价值。本文以红水河大桥为工程背景,运用Midas/Civil和ANSYS两款有限元软件建立模型,对红水河大桥的辅助墩位置、辅助墩数量以及结合段位置进行了研究,研究内容主要包含以下几个方面:(1)分析了目前常见的斜拉桥合理成桥状态确定方法,并根据本文实际研究需要,确定了本文所采取的方法。(2)运用Midas/Civil建立红水河大桥原设计模型,并修改辅助墩位置、辅助墩数量以及结合段位置三个参数建立一系列对比模型,通过对比恒载、活载作用下主梁受力情况,得出一些有价值的结论,为接下来的结构优化设计模型的建立提供依据。(3)介绍红水河大桥ANSYS模型建立过程以及为结构优化设计计算而进行的一些简化。(4)通过对已建成的两百多座斜拉桥的数据统计,结合一些理论分析,确定红水河大桥优化设计的设计变量参数范围,基于前面计算研究,确定主梁最小弯曲应变能、边跨应力幅、结合段应力幅三个目标函数,并将多目标函数转化为统一标函数。(5)对红水河大桥的辅助墩位置、辅助墩数量和结合段位置三个参数进行了优化,并对优化结果进行分析,得出最优设计方案。
[Abstract]:With the completion of a large number of large span bridges in China, China is moving from a large bridge country to a bridge power. In order to realize the dream of a powerful bridge, we must start with the basic research work of the long-span bridge, and the auxiliary pier and the joint section of the long-span hybrid girder cable-stayed bridge are part of it. The setting of auxiliary piers of long-span cable-stayed bridge can obviously improve the distribution of internal force of side span main beam, but the position and quantity of auxiliary pier are different to the improvement degree of main beam internal force. The position of the combined section directly determines the ratio of the length of the main beam with different materials, which determines the distribution of the weight of the main beam, which has an obvious effect on the distribution of the internal force of the main beam. Therefore, the determination of the optimum combination of auxiliary piers, the number of auxiliary piers and the position of the combined section has great influence on the design of long-span hybrid girder cable-stayed bridges, which is worthy of study. Taking Hongshuihe Bridge as the engineering background, using Midas/Civil and ANSYS software to establish the model, the position of auxiliary pier, the number of auxiliary pier and the position of combined section of Hongshui River Bridge are studied in this paper. The main contents of the study are as follows: (1) the common methods for determining the reasonable state of cable-stayed bridges are analyzed, and the actual research needs of this paper are discussed. The method adopted in this paper is determined. (2) the original design model of Hongshuihe Bridge is established by using Midas/Civil, and a series of comparative models are established by modifying the position of auxiliary pier, the number of auxiliary pier and the position of section. Under the action of live load, some valuable conclusions have been drawn on the stress of the main beam. (3) introduce the process of establishing the ANSYS model of Hongshuihe Bridge and some simplification for the structural optimization design calculation. (4) through the completed 200. Statistics of many cable-stayed bridges, Combined with some theoretical analysis, the parameter range of optimum design variables of Hongshuihe Bridge is determined. Based on the previous calculation, the minimum bending strain energy of main girder, the stress amplitude of side span and the stress amplitude of section are determined. The multi-objective function is transformed into a unified standard function. (5) the position of auxiliary pier, the number of auxiliary piers and the position of joint section of Hongshuihe Bridge are optimized, and the optimization results are analyzed, and the optimal design scheme is obtained.
【学位授予单位】：交通运输部公路科学研究院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27
本文编号：2351446
[Abstract]:With the completion of a large number of large span bridges in China, China is moving from a large bridge country to a bridge power. In order to realize the dream of a powerful bridge, we must start with the basic research work of the long-span bridge, and the auxiliary pier and the joint section of the long-span hybrid girder cable-stayed bridge are part of it. The setting of auxiliary piers of long-span cable-stayed bridge can obviously improve the distribution of internal force of side span main beam, but the position and quantity of auxiliary pier are different to the improvement degree of main beam internal force. The position of the combined section directly determines the ratio of the length of the main beam with different materials, which determines the distribution of the weight of the main beam, which has an obvious effect on the distribution of the internal force of the main beam. Therefore, the determination of the optimum combination of auxiliary piers, the number of auxiliary piers and the position of the combined section has great influence on the design of long-span hybrid girder cable-stayed bridges, which is worthy of study. Taking Hongshuihe Bridge as the engineering background, using Midas/Civil and ANSYS software to establish the model, the position of auxiliary pier, the number of auxiliary pier and the position of combined section of Hongshui River Bridge are studied in this paper. The main contents of the study are as follows: (1) the common methods for determining the reasonable state of cable-stayed bridges are analyzed, and the actual research needs of this paper are discussed. The method adopted in this paper is determined. (2) the original design model of Hongshuihe Bridge is established by using Midas/Civil, and a series of comparative models are established by modifying the position of auxiliary pier, the number of auxiliary pier and the position of section. Under the action of live load, some valuable conclusions have been drawn on the stress of the main beam. (3) introduce the process of establishing the ANSYS model of Hongshuihe Bridge and some simplification for the structural optimization design calculation. (4) through the completed 200. Statistics of many cable-stayed bridges, Combined with some theoretical analysis, the parameter range of optimum design variables of Hongshuihe Bridge is determined. Based on the previous calculation, the minimum bending strain energy of main girder, the stress amplitude of side span and the stress amplitude of section are determined. The multi-objective function is transformed into a unified standard function. (5) the position of auxiliary pier, the number of auxiliary piers and the position of joint section of Hongshuihe Bridge are optimized, and the optimization results are analyzed, and the optimal design scheme is obtained.
【学位授予单位】：交通运输部公路科学研究院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27
【参考文献】
相关期刊论文 前1条
1 傅强,张泽鹏,严学寨;斜拉桥结构优化设计初探[J];湖南大学学报(自然科学版);2001年S1期
相关博士学位论文 前1条
1 颜东煌;斜拉桥合理设计状态确定与施工控制[D];湖南大学;2001年
，本文编号：2351446
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