波形钢腹板PC组合箱梁连续刚构桥的施工过程力学分析
发布时间:2019-06-20 17:38
【摘要】:波形钢腹板箱梁桥采用新的钢—混凝土组合结构形式,充分利用混凝土和钢的材料特点。恩阳河大桥是一座典型的波形钢腹板预应力混凝土箱梁连续刚构桥,本文以该桥梁为工程背景,用ANSYS对该桥的施工过程进行力学分析。论文首先介绍了大跨度连续刚构桥的施工方法、施工控制内容和施工控制的计算分析方法。恩阳河大桥是一座波形钢腹板箱梁连续刚构桥,施工中采用了悬臂浇筑法。根据该类型桥梁的结构特点和施工特点,最终选用施工控制中的正装计算法。因该类型桥梁在施工过程中受力复杂,须采用有限元法进行施工过程的受力分析。采用有限元软件ANSYS建立了波形钢腹板箱梁桥的有限元模型。建模具体步骤为:建立底板、横隔板、顶板、预应力钢筋和钢腹板的几何模型,划分单元后对称建立中跨一半的单元,最终形成2#墩处的T构有限元模型。并在附录中就给出建模命令流。研究了该桥在施工过程中的应力和线形。计算结果表明,2#墩顶与0#块结合处应力始终处于受压的安全状态。悬臂施工过程中,0#块与1#块的交界面在各个施工阶段的最大拉压应力均满足要求。每一施工阶段浇筑混凝土后和张拉预应力后梁体的线形变化表明,浇筑混凝土会引起梁体向下的位移,张拉预应力会产生上翘位移。施工中的最大上翘位移发生在6#节段,7#节段后梁体的上翘位移逐渐变小。施工过程中的梁体最大悬臂端出发生向下的位移为9.11mm。所以需给出合理的张拉预应力束才能保证施工过程中梁体线形与设计标高相符。
[Abstract]:The curved steel web box girder bridge adopts a new steel-concrete composite structure, which makes full use of the material characteristics of concrete and steel. Enyang River Bridge is a typical continuous rigid frame bridge with prestressed concrete box girder with wavy steel webs. In this paper, the construction process of the bridge is analyzed by ANSYS with the bridge as the engineering background. This paper first introduces the construction method, construction control content and construction control calculation and analysis method of long-span continuous rigid frame bridge. Enyang River Bridge is a continuous rigid frame bridge with curved steel web box girder. Cantilever pouring method is used in the construction. According to the structural and construction characteristics of this type of bridge, the formal calculation method in construction control is finally selected. Because the force of this type of bridge is complex in the construction process, the finite element method should be used to analyze the force in the construction process. The finite element model of curved steel web box girder bridge is established by using finite element software ANSYS. The specific steps of modeling are as follows: the geometric models of bottom plate, diaphragm, roof, prestressed steel bar and steel web are established, and the middle span element is symmetrically established after dividing the element, and finally the T structure finite element model at pier 2 # is formed. The modeling command flow is given in the appendix. The stress and alignment of the bridge in the construction process are studied. The calculation results show that the stress at the joint of 2 # pier top and 0 # block is always in a safe state of compression. In the process of cantilever construction, the maximum tensile and compressive stress of the interface between 0 # block and 1 # block meets the requirements in each construction stage. The linear changes of the beam body after pouring concrete and tensioned prestress in each construction stage show that the pouring concrete will cause the downward displacement of the beam body, and the tensioned prestress will produce the upward warping displacement. The maximum upwarping displacement occurred in 6 # segment, and the upper warping displacement of 7 # segment rear beam decreased gradually. The downward displacement of the maximum cantilever end of the beam in the construction process is 9.11 mm. Therefore, it is necessary to give a reasonable tensioned prestressed beam in order to ensure that the beam alignment is consistent with the design elevation in the construction process.
【学位授予单位】:西南交通大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:U445.4;U448.23
本文编号:2503400
[Abstract]:The curved steel web box girder bridge adopts a new steel-concrete composite structure, which makes full use of the material characteristics of concrete and steel. Enyang River Bridge is a typical continuous rigid frame bridge with prestressed concrete box girder with wavy steel webs. In this paper, the construction process of the bridge is analyzed by ANSYS with the bridge as the engineering background. This paper first introduces the construction method, construction control content and construction control calculation and analysis method of long-span continuous rigid frame bridge. Enyang River Bridge is a continuous rigid frame bridge with curved steel web box girder. Cantilever pouring method is used in the construction. According to the structural and construction characteristics of this type of bridge, the formal calculation method in construction control is finally selected. Because the force of this type of bridge is complex in the construction process, the finite element method should be used to analyze the force in the construction process. The finite element model of curved steel web box girder bridge is established by using finite element software ANSYS. The specific steps of modeling are as follows: the geometric models of bottom plate, diaphragm, roof, prestressed steel bar and steel web are established, and the middle span element is symmetrically established after dividing the element, and finally the T structure finite element model at pier 2 # is formed. The modeling command flow is given in the appendix. The stress and alignment of the bridge in the construction process are studied. The calculation results show that the stress at the joint of 2 # pier top and 0 # block is always in a safe state of compression. In the process of cantilever construction, the maximum tensile and compressive stress of the interface between 0 # block and 1 # block meets the requirements in each construction stage. The linear changes of the beam body after pouring concrete and tensioned prestress in each construction stage show that the pouring concrete will cause the downward displacement of the beam body, and the tensioned prestress will produce the upward warping displacement. The maximum upwarping displacement occurred in 6 # segment, and the upper warping displacement of 7 # segment rear beam decreased gradually. The downward displacement of the maximum cantilever end of the beam in the construction process is 9.11 mm. Therefore, it is necessary to give a reasonable tensioned prestressed beam in order to ensure that the beam alignment is consistent with the design elevation in the construction process.
【学位授予单位】:西南交通大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:U445.4;U448.23
【引证文献】
相关硕士学位论文 前1条
1 高明天(Cao Minh Thien);多工作面悬浇施工波形钢腹板PC组合箱梁桥力学性能分析[D];东南大学;2017年
,本文编号:2503400
本文链接:https://www.wllwen.com/kejilunwen/daoluqiaoliang/2503400.html