跨海大桥U-RC组合桥墩设计

林上顺; 黄卿维; 陈宝春; 陈扬弘

跨海大桥U-RC组合桥墩设计

林上顺^{1, 2,},
黄卿维^2, ,,
陈宝春²,
陈扬弘²

1.
福建工程学院福建省土木工程新技术与信息化重点实验室, 福建福州 350118
2.
福州大学土木工程学院, 福建福州 350108

基金项目:

国家自然科学基金项目 U1305245

详细信息

作者简介:
林上顺(1972-), 男, 福建永泰人, 福建工程学院副教授, 工学博士, 从事桥梁与结构工程研究

通讯作者:
黄卿维(1982-), 男, 福建惠安人, 福州大学副研究员, 工学博士

中图分类号: U443.22
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- 被引次数: 0
出版历程
- 收稿日期: 2017-03-22
- 刊出日期: 2017-08-25

Design of U-RC composite pier of sea-crossing bridge

1.
Fujian Provincial Key Laboratory of Advanced Technology and Information in Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China
2.
School of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China

More Information

Author Bio:
LIN Shang-shun(1972-), male, associate professor, PhD, +86-591-22863252, midas2008@126.com

HUANG Qing-wei(1982-), male, associate researcher, PhD, +86-591-22865349, 9380226@qq.com

摘要

摘要: 为解决跨海桥梁桥墩施工与防腐问题, 提出了超高性能混凝土(UHPC) -钢筋混凝土(RC) 组合桥墩新结构, 简称U-RC组合桥墩, 以UHPC外筒作为永久模柱, 现浇内核钢筋混凝土; 以平潭海峡大桥为工程背景, 开展了U-RC组合桥墩的结构设计与计算, 并与原设计方案的工程量和造价进行了比较; 进行了3根内核RC柱、3根UHPC模柱、3根U-RC组合桥墩的极限承载力试验, 测量了试件的混凝土纵向应变与横向应变, 研究了试件的破坏形态与裂缝发展过程, 得到了试件的极限承载力试验值, 分析了U-RC组合桥墩的受力性能。研究结果表明: U-RC组合桥墩的承载力大于设计内力, 满足现行规范要求; 采用UHPC模柱取代钢模板的桥墩设计方案, 可节约钢材约2 410t, 工程造价节省约30%;3根UHPC圆筒的极限荷载均值为1 342kN, 3根RC柱的极限荷载均值为1 370kN, 二者之和小于3根U-RC组合桥墩极限荷载均值3 033kN, 说明UHPC模柱对核心混凝土有一定的套箍作用, 采用简单迭加方法计算U-RC组合桥墩的轴压极限承载力是可行且偏保守的; 在轴压试验中, U-RC组合桥墩的破坏模式为核心混凝土的横向变形导致UHPC模柱出现竖向裂缝, 并与核心混凝土在界面处分离; 达到极限荷载破坏时, 外包UHPC层出现纵向裂缝, 荷载增大, 裂缝增长, 并有混凝土剥落现象, 但U-RC组合桥墩破坏时其外包UHPC层纵向应变未达到极限压应变。
- 桥梁工程 /
- 跨海大桥 /
- 组合桥墩 /
- 永久模柱 /
- 超高性能混凝土 /
- 钢筋混凝土 /
- 受力性能
Abstract: In order to solve the construction and anti-corrosion problems of pier of sea-crossing bridge, a new structure of composite pier of ultra-high performance concrete (UHPC) and reinforced concrete (RC) (short for U-RC composite pier) was designed, and UHPC cylinder was taken as permanent cylinder to cast core reinforced concrete. The Pingtan Strait Bridge was taken as project background, the structure design and calculation of U-RC composite pier were carried out, and the workload and cost of U-RC composite pier were compared with the ones of original design scheme. The ultimate bearing capacity tests of three core reinforced concrete columns, three UHPC cylinders and three U-RC composite piers were carried out, the longitudinal andtransverse strains of concrete for the specimens were measured, the failure modes and the developments of cracks were observed, the test values of ultimate bearing capacities were obtained, and the mechanical properties of U-RC composite pier were analyzed. Research result indicates that the bearing capacity of U-RC composite pier is greater than the design value of internal force, which meets the current specification requirement. The design scheme that adopts UHPC cylinder to replace steel template, can save about 2 410 tof steel, and the total cost saves nearly 30%. The average bearing capacities of three UHPC cylinders and three RC columns are1 342 kN and 1 370 kN, respectively, and their sum is less than the average bearing capacity of three U-RC composite piers (3 033 kN), which indicates that the UHPC cylinder has certain confinement effect for core concrete, and it is feasible and conservative to calculate the ultimate bearing capacity of U-RC pier under axial compression with simple superposition method. In the axial compression experiment, the failure mode of U-RC composite pier is that the lateral deformation of core concrete leads to the vertical fracture of UHPC cylinder and the separation of UHPC and core concrete at the interface. At the ultimate load, the coating UHPC layers have vertical cracks that grow with the increase of the load, and the flaking and spalling phenomena of concrete appear. But when the U-RC composite pier is damaged, the longitudinal strain of coating UHPC does not reach the ultimate compressive strain.
- bridge engineering /
- sea-crossing bridge /
- composite pier /
- permanent cylinder /
- ultra-high performance concrete (UHPC) /
- reinforced concrete /
- mechanical property

HTML全文

图 1 平潭海峡大桥

Figure 1. Pingtan Strait Bridge

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图 2 桥墩构造(单位: cm)

Figure 2. Structure of pier (unit: cm)

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图 3 设计桥墩构造(单位: cm)

Figure 3. Structure of designed pier (unit: cm)

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图 4 UHPC模柱接头构造(单位: cm)

Figure 4. Structure of joint of UHPC cylinder (unit: cm)

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图 5 设计桥梁有限元模型

Figure 5. Finite element model of designed bridge

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图 6 U-RC验算截面

Figure 6. Checking section of U-RC

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图 7 受力模柱

Figure 7. Cylindrical template with forces

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图 8 筒体运输

Figure 8. Transport of cylinder

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图 9 桥墩施工现场

Figure 9. Construction scene of pier

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图 10 组合桥墩构造(单位: mm)

Figure 10. Structure of composite pier (unit: mm)

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图 11 组合桥墩试件

Figure 11. Specimens of composite pier

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图 12 压力机

Figure 12. Compression machine

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图 13 U-RC1裂缝

Figure 13. Cracks of U-RC1

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图 14 U-RC1破坏

Figure 14. Damage of U-RC1

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表 1 UHPC配合比

Table 1. Mixing proportion of UHPC

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表 2 U-RC试件承载力与应变

Table 2. Bearing capacities and strains of U-RC specimens

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