π型主梁曲线斜拉桥若干设计参数研究
发布时间：2018-12-15 16:49
【摘要】：曲线斜拉桥是主梁呈曲线的斜拉桥。其兼具弯梁桥和斜拉桥的受力特点,主梁在承受弯矩、剪力作用的同时承受了较大的扭矩作用,其力学行为比直线斜拉桥更为复杂,具有高度的空间性。针对π型主梁曲线斜拉桥的理论分析及设计优化等问题,依托刚果(布)布拉柴维尔滨河大道曲线斜拉桥项目,以桥梁专用分析软件Midas/Civil作为计算平台,主要针对曲线斜拉桥最主要的影响参数—圆心角(弧长比例、曲率半径)及其余较重要的设计参数(辅助墩设置位置、桥塔塔跨比)开展研究分析工作。论文研究的主要内容如下:1、详细介绍了曲梁桥及斜拉桥的计算分析理论,通过推导Vlasov方程阐述π型曲线主梁"弯扭耦合"作用,以便对曲线斜拉桥进行精确分析;2、建立全桥有限元模型,将计算结果与实桥实测数据进行对比,以验证有限元模型的正确性和合理性;3、结合专业知识及工程实践,选取对曲线斜拉桥结构受力行为有重要影响的设计参数即辅助墩设置位置、桥塔塔跨比、弧长比例、曲率半径4个关键参数进行参数分析。基于全桥有限元模型,以通过分别改变这4个设计参数取值的方式,建立多个有限元模型,对计算结果进行对比分析,得出单个设计参数改变对结构力学行为的影响规律及其合理取值范围。4、基于正交试验设计和极差分析方法对若干设计参数进一步进行优化。以辅助墩设置位置、桥塔塔跨比、弧长比例、曲率半径为4个因素,每个因素在较合理范围内确定3个水平,选取能够反应曲线斜拉桥整体受力性能的10个特性值作为试验指标,选用L9(34)正交表,并运用极差分析法,确定4个因素对单个指标的影响程度大小,找出各指标对应的主要因素和次要因素,并得出各因素变化对各个指标的影响规律,从而进一步优化4个设计参数的合理取值范围。
[Abstract]:Curved cable-stayed bridge is a curved cable-stayed bridge with main girder. Its mechanical behavior is more complex than that of linear cable-stayed bridge, and its mechanical behavior is more complicated than that of linear cable-stayed bridge. In view of the theoretical analysis and design optimization of 蟺 type main girder curved cable-stayed bridge, the special analysis software Midas/Civil is used as the calculation platform based on the Congo (Brazzaville) Riverside Avenue Curve Cable-Stayed Bridge Project. This paper mainly focuses on the research and analysis of the most important parameters of curved cable-stayed bridge such as the center angle (arc length ratio, curvature radius) and other important design parameters (auxiliary pier location, tower / span ratio). The main contents of this paper are as follows: 1. The theory of calculation and analysis of curved girder bridge and cable-stayed bridge is introduced in detail, and the "bending and torsional coupling" action of 蟺 type curved main girder is explained by deducing the Vlasov equation in order to accurately analyze the curved cable-stayed bridge; 2. The finite element model of the whole bridge is established, and the calculation results are compared with the measured data of the real bridge in order to verify the correctness and rationality of the finite element model. 3. Combined with professional knowledge and engineering practice, the design parameters which have important influence on the stress behavior of curved cable-stayed bridge are analyzed, including the location of auxiliary piers, the ratio of tower to span, the ratio of arc length, and the radius of curvature. Based on the full-bridge finite element model, several finite element models are established by changing the values of the four design parameters, and the calculated results are compared and analyzed. The influence of single design parameter on structural mechanical behavior and its reasonable value range are obtained. 4. Some design parameters are further optimized based on orthogonal design and range analysis method. The location of auxiliary piers, the ratio of tower to tower span, the ratio of arc length and curvature radius are four factors, and each factor is determined three levels within a reasonable range. In this paper, 10 characteristic values which can respond curve cable-stayed bridge are selected as test index, L9 (34) orthogonal table is selected, and the degree of influence of four factors on single index is determined by using range analysis method. The main and secondary factors corresponding to each index are found out, and the influence law of each factor change on each index is obtained, so as to further optimize the reasonable value range of the four design parameters.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27
本文编号：2380985
[Abstract]:Curved cable-stayed bridge is a curved cable-stayed bridge with main girder. Its mechanical behavior is more complex than that of linear cable-stayed bridge, and its mechanical behavior is more complicated than that of linear cable-stayed bridge. In view of the theoretical analysis and design optimization of 蟺 type main girder curved cable-stayed bridge, the special analysis software Midas/Civil is used as the calculation platform based on the Congo (Brazzaville) Riverside Avenue Curve Cable-Stayed Bridge Project. This paper mainly focuses on the research and analysis of the most important parameters of curved cable-stayed bridge such as the center angle (arc length ratio, curvature radius) and other important design parameters (auxiliary pier location, tower / span ratio). The main contents of this paper are as follows: 1. The theory of calculation and analysis of curved girder bridge and cable-stayed bridge is introduced in detail, and the "bending and torsional coupling" action of 蟺 type curved main girder is explained by deducing the Vlasov equation in order to accurately analyze the curved cable-stayed bridge; 2. The finite element model of the whole bridge is established, and the calculation results are compared with the measured data of the real bridge in order to verify the correctness and rationality of the finite element model. 3. Combined with professional knowledge and engineering practice, the design parameters which have important influence on the stress behavior of curved cable-stayed bridge are analyzed, including the location of auxiliary piers, the ratio of tower to span, the ratio of arc length, and the radius of curvature. Based on the full-bridge finite element model, several finite element models are established by changing the values of the four design parameters, and the calculated results are compared and analyzed. The influence of single design parameter on structural mechanical behavior and its reasonable value range are obtained. 4. Some design parameters are further optimized based on orthogonal design and range analysis method. The location of auxiliary piers, the ratio of tower to tower span, the ratio of arc length and curvature radius are four factors, and each factor is determined three levels within a reasonable range. In this paper, 10 characteristic values which can respond curve cable-stayed bridge are selected as test index, L9 (34) orthogonal table is selected, and the degree of influence of four factors on single index is determined by using range analysis method. The main and secondary factors corresponding to each index are found out, and the influence law of each factor change on each index is obtained, so as to further optimize the reasonable value range of the four design parameters.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27
【引证文献】
相关硕士学位论文 前1条
1 郭珊;曲线斜拉桥模型设计及试验研究[D];西南交通大学;2017年
，本文编号：2380985
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