西固黄河大桥施工全过程有限元分析
发布时间：2018-08-04 19:49
【摘要】：结合梁斜拉桥具有施工快捷、跨越能力较大和较为经济等优势,在中国近年来得到了广泛的应用,可以说,结合梁斜拉桥是大跨桥梁中较为具有竞争力的桥型之一。由于结合梁斜拉桥也是一种高次超静定的复杂结构,再加上独特的悬臂拼装施工工艺,施工中斜拉索索力的调整,施工拼装的线性控制、结构自重和施工外加荷载与设计值的偏差等因素,都会对最终成桥状态的线形与应力分布产生较大的影响。由于主梁框架、横梁、混凝土桥面板等构件是事先在预制场预制好的,然后现场进行悬臂拼装,用高强螺栓进行连接,因此,严格把关施工控制成为了结合梁斜拉桥施工的关键。本文基于西固黄河大桥拟建工程项目,探讨了结合梁斜拉桥施工全过程中的静力性能做了一些研究。查阅相关文献,了解了结合梁斜拉桥的起源、发展与分类,还简单介绍了钢混结合梁的特点、分类及结合梁斜拉桥的国内外的发展现状。斜拉桥是高次超静定结构,施工阶段受力相对较复杂,从而对斜拉桥的施工阶段受力特点和规律进行了总结。详细地叙述了有限元方程的数值解法和施工过程分析方法。以兰州西固黄河大桥拟建工程项目为背景,根据斜拉桥结构设计原理、施工阶段受力特点及其悬臂拼装施工工艺,借助Midas Civil 2012通用有限元桥梁软件,分别建立西固黄河大桥施工全过程有限元双主梁模型和简化模型,运用正装分析法确定了合理的成桥状态,对其关键施工阶段的主梁位移和应力做对比分析,以校核模型的准确性。对该桥施工过程静力进行了系统性分析,分析得出悬臂拼装施工过程中的主塔纵向位移、主塔应力、主梁竖向位移、主梁内力、主梁应力、桥面板应力和斜拉索索力的变化。并通过分析得出各施工阶段结构位移、内力和应力的变化规律,结果表明:施工阶段中各项指标满足规范要求,结构受力安全,成桥状态下主梁、主塔和斜拉索索力均满足成桥目标的要求。另外,在正常使用阶段,进行了两种荷载基本组合,检算了该桥分别在这两种作用效应组合荷载工况下,主梁应力、主塔应力和斜拉索的安全系数满足相关规范要求,结构受力是安全的。
[Abstract]:Combined girder cable-stayed bridge has the advantages of quick construction, large span capacity and more economical. It has been widely used in China in recent years. It can be said that the combined girder cable-stayed bridge is one of the more competitive bridge types in long-span bridges. Combined with beam cable-stayed bridge is also a kind of high order statically indeterminate complex structure, plus the unique cantilever assembling construction technology, the adjustment of cable-stayed cable force in construction, and the linear control of construction assembly. The factors such as the weight of the structure and the deviation between the construction load and the design value will have a great influence on the line shape and stress distribution of the final bridge state. Because the main beam frame, crossbeam, concrete deck slab and other components are prefabricated in the precast yard, then the cantilever assembly is carried out in the field, and the high strength bolts are used to connect, so, Strict control of construction has become the key to the construction of cable-stayed bridge combined with beam. Based on the proposed project of Xigu Yellow River Bridge, this paper discusses the static performance of the girder cable-stayed bridge during the construction process. The origin, development and classification of cable-stayed bridge with composite beam are discussed in this paper. The characteristics of steel-concrete composite beam, the classification and the development of cable-stayed bridge with composite beam at home and abroad are also briefly introduced. The cable-stayed bridge is a high-order statically indeterminate structure, which is relatively complicated in construction stage. Therefore, the stress characteristics and law of cable-stayed bridge in construction stage are summarized. The numerical solution of finite element equation and the analysis method of construction process are described in detail. Taking the proposed project of Lanzhou Xigu Yellow River Bridge as the background, according to the design principle of cable-stayed bridge structure, the stress characteristics of the construction stage and the construction technology of cantilever assembly, the general finite element bridge software Midas Civil 2012 is used. The finite element double main beam model and the simplified model of Xigu Yellow River Bridge during the whole construction process are established respectively. The reasonable state of the bridge is determined by using the normal fitting analysis method, and the displacement and stress of the main beam in the key construction stage are compared and analyzed. To check the accuracy of the model. Based on the systematic analysis of the static force during the construction of the bridge, the changes of the longitudinal displacement of the main tower, the stress of the main tower, the vertical displacement of the main beam, the internal force of the main beam, the stress of the deck slab and the cable force of the cable are obtained. And through the analysis of the structural displacement, internal force and stress changes in each construction phase, the results show that: in the construction stage, the indexes meet the requirements of the code, the structure is safe, the main beam under the state of the bridge, Both the main tower and cable-stayed cable force meet the requirements of the bridge target. In addition, in the normal service stage, two basic combinations of loads are carried out. Under the combined load conditions of the two effects respectively, the stress of the main beam, the stress of the main tower and the safety factor of the stay cables meet the requirements of the relevant codes. The force on the structure is safe.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445;U448.27
本文编号：2164964
[Abstract]:Combined girder cable-stayed bridge has the advantages of quick construction, large span capacity and more economical. It has been widely used in China in recent years. It can be said that the combined girder cable-stayed bridge is one of the more competitive bridge types in long-span bridges. Combined with beam cable-stayed bridge is also a kind of high order statically indeterminate complex structure, plus the unique cantilever assembling construction technology, the adjustment of cable-stayed cable force in construction, and the linear control of construction assembly. The factors such as the weight of the structure and the deviation between the construction load and the design value will have a great influence on the line shape and stress distribution of the final bridge state. Because the main beam frame, crossbeam, concrete deck slab and other components are prefabricated in the precast yard, then the cantilever assembly is carried out in the field, and the high strength bolts are used to connect, so, Strict control of construction has become the key to the construction of cable-stayed bridge combined with beam. Based on the proposed project of Xigu Yellow River Bridge, this paper discusses the static performance of the girder cable-stayed bridge during the construction process. The origin, development and classification of cable-stayed bridge with composite beam are discussed in this paper. The characteristics of steel-concrete composite beam, the classification and the development of cable-stayed bridge with composite beam at home and abroad are also briefly introduced. The cable-stayed bridge is a high-order statically indeterminate structure, which is relatively complicated in construction stage. Therefore, the stress characteristics and law of cable-stayed bridge in construction stage are summarized. The numerical solution of finite element equation and the analysis method of construction process are described in detail. Taking the proposed project of Lanzhou Xigu Yellow River Bridge as the background, according to the design principle of cable-stayed bridge structure, the stress characteristics of the construction stage and the construction technology of cantilever assembly, the general finite element bridge software Midas Civil 2012 is used. The finite element double main beam model and the simplified model of Xigu Yellow River Bridge during the whole construction process are established respectively. The reasonable state of the bridge is determined by using the normal fitting analysis method, and the displacement and stress of the main beam in the key construction stage are compared and analyzed. To check the accuracy of the model. Based on the systematic analysis of the static force during the construction of the bridge, the changes of the longitudinal displacement of the main tower, the stress of the main tower, the vertical displacement of the main beam, the internal force of the main beam, the stress of the deck slab and the cable force of the cable are obtained. And through the analysis of the structural displacement, internal force and stress changes in each construction phase, the results show that: in the construction stage, the indexes meet the requirements of the code, the structure is safe, the main beam under the state of the bridge, Both the main tower and cable-stayed cable force meet the requirements of the bridge target. In addition, in the normal service stage, two basic combinations of loads are carried out. Under the combined load conditions of the two effects respectively, the stress of the main beam, the stress of the main tower and the safety factor of the stay cables meet the requirements of the relevant codes. The force on the structure is safe.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445;U448.27
【参考文献】
相关期刊论文 前2条
1 王勋文,辛学忠,潘家英,程庆国;确定PC斜拉桥合理恒载索力方法的探讨[J];桥梁建设;1996年04期
2 曹海滨,郝景雨,蔡志娥,金建新;斜拉桥拉索无应力长度的算法研究[J];中南公路工程;2004年02期
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