悬臂浇注施工斜拉桥的误差控制方法

汪劲丰; 徐兴; 项贻强

悬臂浇注施工斜拉桥的误差控制方法

浙江大学建筑工程学院，浙江杭州 310027

基金项目:

国家自然科学基金项目 50708091

详细信息

作者简介:
汪劲丰(1976-), 男, 安徽怀宁人, 浙江大学副教授, 工学博士, 从事桥梁仿真分析及施工控制研究

中图分类号: U441.5;U448.27
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- 被引次数: 0
出版历程
- 收稿日期: 2008-01-11
- 刊出日期: 2008-08-25

Method of construction error control for cantilever-casting cable-stayed bridge

School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, Zhejiang, China

More Information

Author Bio:
WANG Jin-feng(1976-), male, associate professor, PhD, +86-571-87951804, wangjfcong@126.com

摘要

摘要: 在预应力混凝土(PC)斜拉桥悬臂施工中, 为了减小索力及线形误差, 分析了误差原因及其控制现状, 提出了模型误差及悬浇效应误差的控制方法。结合三维实体等参元和板壳单元的优点, 构造了适用于复杂桥梁结构空间分析的实体退化单元, 建立了离散钢筋模型。根据挂篮牵索锚固点处的变形协调条件, 推导出牵索索力随混凝土浇筑的增量计算公式, 建立了悬浇过程中各工况下挂篮前端标高控制的计算公式。应用结果表明: 在悬浇施工过程, 牵索索力控制精度达到了3%, 成桥索力控制精度达到5%, 悬臂端标高误差控制在1 cm内, 因此, 提出的控制方法可实现PC斜拉桥悬浇过程各工况下索力及线形的准确预测。
- 桥梁工程 /
- 混凝土斜拉桥 /
- 误差控制 /
- 悬臂浇注 /
- 施工误差
Abstract: During the cantilever-casting construction of prestressed concrete(PC) cable-stayed bridge, in order to reduce the errors of cable tension and line shape, the error cause and present situation of control means were analyzed, and the control methods of model error and cantilever-casting simulation error were discussed.With the combination of 3D isoparametric element and shell element, degenerated solid element was proposed for the spatial analysis of complex PC bridge, and discrete bar model was set up.According to the deformation compatibility condition of traction cable's anchorage, the increment of cable tension during casting concrete was computed, and the calculation formula of traveler's front level was educed.Application result indicates that the control precision of trailing cable tension is within 3%, the control precision of final cable tension is within 5%, and the error of traveler's front level is within 1 cm.Therefore, the cable tension and line shape of PC cable-stayed bridge under all construction conditions can be well predicted by the proposed method.
- bridge engineering /
- concrete cable-stayed bridge /
- error control /
- cantilever casting /
- construction error

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图 1 单元中预应力筋

Figure 1. Prestressing steels in element

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图 2 牵索挂篮受力

Figure 2. Actions on cable-suspended traveler

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图 3 主桥立面

Figure 3. Elevation view of main bridge

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图 4 有限元网格

Figure 4. Finite element meshes

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图 5 考虑预应力筋的有限元网格

Figure 5. Finite element meshes with prestressing tendon

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图 6 正应力的横向分布

Figure 6. Transversal distributions of axial stresses

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图 7 正应力的横向分布随施工过程变化

Figure 7. Change of transversal distributions for axial stresses during building

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图 8 挠度比较

Figure 8. Deflection comparison

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表 1 牵索索力控制结果

Table 1. Control result of cable tension

工况	实测值/kN	预测值/kN	差值/ kN
空挂篮	0.0	0.0	0.0
第1次牵索	1 050.0	1 050.0	0.0
浇前一半混凝土	1 397.5	1 408.5	-11.0
第2次牵索	2 100.0	2 100.0	0.0
浇后一半混凝土	2 526.0	2 514.5	11.5

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表 2 相对标高控制结果

Table 2. Control result of relative elevation

工况	实测值/m	预测值/m	差值/m
空挂篮	0.000	0.000	0.000
第1次牵索	0.118	0.123	-0.005
浇前一半混凝土	-0.012	-0.003	-0.009
第2次牵索	0.048	0.054	-0.006
浇后一半混凝土	-0.046	-0.044	-0.002
注: 相对标高是以立模位置为基准点。

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表 3 索力比较

Table 3. Comparison of cable tensions

索号	实测值/kN	预测值/kN	相对误差/%
1	4 367.4	4 400.0	0.74
2	3 989.7	4 197.0	-4.94
3	3 631.5	3 731.8	-2.68
4	3 387.5	3 369.9	0.52
5	3 074.5	3 164.0	-2.80
6	2 925.9	2 993.1	-2.24

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表 4 索力误差比较

Table 4. Comparison of cable tension errors

误差/%	> 10	9~10	8~9	7~8	6~7	5~6
平面分析	4	3	4	12	10	17
本文分析	1	0	0	4	3	12
注: 表中数据为斜拉索的根数, 全桥共152根索。

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