NXZT非对称独塔转体斜拉桥的变形和受力状态研究

发布时间：2018-01-04 06:21

本文关键词：NXZT非对称独塔转体斜拉桥的变形和受力状态研究　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：NXZT桥是一座孔跨布置为112m+80m+32m的三跨独塔双索面单线铁路预应力混凝土斜拉桥。该桥主梁采用槽型截面,桥塔与主梁固结两个方向都为倒Y字形结构,112m+80m主跨采用转体施工。该桥结构新颖,受力复杂。本文对该桥在转体前、转体时和成桥状态的受力性能进行了较为系统的研究。主要工作和成果如下： 1、采用有限单元法,计算确定了80m跨梁体的压重,以确保转体过程中塔底受力平衡,为NXZT桥悬臂转体施工创造了条件。 2、反复计算确定了转体时的目标索力、张拉顺序和张拉力。按此给定的目标索力、张拉顺序和张拉力,张拉过程安全,转体时梁体基本平直,梁、塔受力合理,保证了转体时NXZT桥的安全性和转体到位后梁端的顺利落座。 3、反复计算确定了成桥状态的目标索力、张拉顺序和张拉力,按此给定的目标索力、张拉顺序和张拉力,张拉过程和张拉完毕后桥梁受力合理,减少了斜拉索张拉次数、提高人员工作效率。 4、考虑施工过程和施工方法对NXZT桥完成了恒载和最不利活载组合作用下的变形和受力性能分析。结果表明,该桥施工过程安全,桥梁有足够的强度和刚度。本文的研究成果为NXZT桥的设计和施工监控提供了可靠的依据,对其他类似非对称转体斜拉桥也有一定的参考价值。
[Abstract]:NXZT bridge is a span layout for three span single tower and double cable plane 112m+80m+32m single track railway prestressed concrete cable-stayed bridge. The main girder is groove section of pylon and beam consolidation in two directions for the inverted Y shape structure, the main span of 112m+80m. The bridge Swivel Construction with novel structure and complex stress. The bridge before swiveling, twist and stress performance of bridge condition was studied systematically. The main work and results are as follows:
1, the finite element method is used to calculate the pressure weight of the 80m cross beam to ensure the balance of the bottom of the tower during the turning process, which creates conditions for the construction of the cantilever body of the NXZT bridge.
2, repeatedly calculated swivel target of cable force, tension sequence and tension force. According to the given target of cable force, tension order and tension, tension process safety, twist beam basic straight beam, the tower stress is reasonable, to ensure that the NXZT bridge with the safety and swivel in place after the end of beam smooth seat.
3, repeated calculation determines the target cable force, tension sequence and tension force of the finished bridge. According to the given target cable force, tension sequence and tension force, tension process and tension after completion, the force of the bridge is reasonable, which reduces the tension times of the stay cables and improves the work efficiency of the personnel.
4, considering the construction process and construction method, the deformation and mechanical performance of the NXZT bridge under the combined action of the dead load and the most unfavorable live load is analyzed. The results show that the bridge is safe in construction process, and the bridge has enough strength and stiffness.
The research results of this paper provide a reliable basis for the design and construction monitoring of the NXZT bridge, and also have some reference value for other similar asymmetrical rotary cable-stayed bridges.

【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.27

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