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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

27卷

期数:

2010年03期

页码:

1-7

栏目:

出版日期:

2010-09-20

文章信息/Info

Title:

Design of Late Spare Tendon for Long-span PC Box Girder Bridge Based on Uncertainty Analysis

作者:

潘钻峰,吕志涛

东南大学 混凝土及预应力混凝土结构教育部重点实验室,江苏 南京 210096

Author(s):

PAN Zuan-feng, LU Zhi-tao

Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China

关键词:

大跨径PC箱梁桥;  备用束;  拉丁超立方抽样;  徐变;  收缩;  预应力损失

Keywords:

long-span PC box girder bridge;  spare tendon;  Latin hypercube sampling;  creep;  shrinkage;  prestress loss

分类号:

U448.35

DOI:

-

文献标志码:

A

摘要:

介绍了大跨径PC箱梁桥时变效应的不确定性分析方法,在数值模拟中采用了拉丁超立方抽样(LHS)方法,减少了抽样次数,对实桥的长期变形进行了预测,并给出了具有一定置信水平的长期变形区间。对体外备用束的布置方案进行了对比,并根据长期变形置信界限值与确定性计算值的差值确定后期备用束的数量。结果表明:布置体外顶板束和折线束对改善长期下挠病害比较有效。

Abstract:

Uncertainty analysis method of the time-dependent effect for long-span prestressed concrete(PC)box girder was introduced. Latin hypercube sampling(LHS)method was adopted to improve sampling precision and decrease sampling number in numerical simulation. The time-dependent deformation at mid-span due to concrete creep and shrinkage was analyzed, and the confidence interval of the deformation at mid-span was provided, considering modeling uncertainties and random properties of influencing factors. Moreover, the efficiencies of different arrangement schemes of spare tendons were compared, and the determination of spare tendons was performed according to the differences between the lower limit of the confidence interval of the deformation and the certain value of that. The results show that external tendons and curved tendons are more effective on improving long-term deflection.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2010-06-10
基金项目:交通部科技攻关项目(20063180001)
作者简介:潘钻峰(1981-),男,江苏高邮人,工学博士研究生,E-mail:jsgyppp@163.com。

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更新日期/Last Update: 2010-09-20