全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

现浇箱梁预应力钢筋张拉方式影响分析

, PP. 83-88

Keywords: 桥梁工程,现浇箱梁,有限元分析,预应力钢筋张拉方式,预应力损失,有效预应力

Full-Text   Cite this paper   Add to My Lib

Abstract:

为研究预应力钢筋张拉方式对主梁变形、应力和有效预应力的影响,确保桥梁在施工过程的安全及成桥状态下受力合理,以从莞高速东莞段某匝道桥第1联——3×20m现浇混凝土箱梁为工程背景,采用MIDAS/CIVIL空间有限元分析软件,考虑匝道桥的平弯、纵坡、混凝土的收缩徐变、强度形成过程及预应力钢筋的5项损失等,在不改变预应力线形和张拉控制应力情况下,对逐跨单端张拉(方案1)、先单跨后两跨单端张拉(方案2)和三跨两端张拉(方案3)3种张拉方式进行了施工过程模拟分析,并对施工阶段主梁应力、成桥阶段主梁应力、变形、预应力钢筋有效预应力进行分析比较。结果表明在施工阶段,方案1、方案2在距桥台侧梁端46.71m处主梁顶面出现了大于混凝土设计值的拉应力;在成桥阶段,方案1主梁变形值最大,方案3主梁变形值最小,但在距桥台侧梁端31.71m处主梁顶面存在最大值为0.17MPa的拉应力;张拉方式直接影响有效预应力值的大小及分布情况,与方案1相比,方案2、方案3在中跨跨中附近处的有效预应力较小,设计验算时应给予关注。

References

[1]  JTGD 62—2004,公路钢筋混凝土及预应力混凝土桥 涵设计规范[S]. JTGD 62—2004,Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts [S].
[2]  李双一,王艳琴,张一玉.浅谈后张法预应力施工过 程中的应力损失分析及控制[J].辽宁交通科技, 2005(9):52-56. LI Shuangyi,WANG Yanqin,ZHANG Yiyu.Analysis and Control of Stress Loss in the Process of Presstressed Contruction by Post-tensioning Method [J].Liaoning Communication Science and Technology,2005(9):52- 56.
[3]  程寿山,李兴庆,于刚勤,等.预应力连续梁桥预应力损失预测及测试方法研究[J].公路交通科技, 2006,23(4):71-73. CHENG Shoushan,LI Xingqing,YU Gangqin,et al. Research on Predication and Test Method to Prestressed a Concrete Continuous Beam Bridge [J].Journal of Highway and Transportation Research and Development, 2006,23(4):71-73.
[4]  BARR P J,KUKAY B M,HALLING M W.Comparison of Prestress Losses for a Prestress Concrete Bridge Made with High-performance Concrete [J].Journal of Bridge Engineering,2008,13(5):468-475.
[5]  朱琛.预应力高性能混凝土桥的预应力损失比较 [J].世界桥梁,2010(3):23-27. ZHU Chen.Comparison of Prestress Losses for a Prestressed Concrete Bridge Made with High-performance Concrete [J].World Bridges,2010(3):23-27.
[6]  王存江.高性能混凝土桥梁的预应力损失分析[J]. 交通标准化,2010(13):217-219. WANG Cunjiang.Prestress Loss of High Performance Concrete Bridge [J].Transport Standardization,2010 (13):217-219.
[7]  李准华,刘钊.大跨度预应力混凝土梁桥预应力损失 及敏感性分析[J].世界桥梁,2009(1):36-39. LI Zhunhua,LIU Zhao.Analysis of Prestressing Loss and Sensitivity of Long Span Prestressed Concrete Beam Bridge [J].World Bridges,2009(1):36-39.
[8]  沈成武,闻骥骏,黄志刚,等.大跨度桥梁预应力损 失的遗传算法识别[J].武汉理工大学学报,2002, 24(1):62-65. SHENG Chengwu,WEN Jijun,HUANG Zhigang,et al. Genetic Algorithm in Identifying Pre-stress Loss of the Long Span Bridge [J].Journal of Wuhan University of Technology,2002,24(1):62-65.
[9]  胡狄,陈政清.考虑反向摩阻的后张法PC 构件锚固 损失的计算[J].中国公路学报,2004,17(1): 38-42. HU Di,CHEN Zhengqing.Computation of Stress Loss in Prestressed Steel due to Anchorage Set Considering Function of Reverse-friction in PC Members [J].China Journal of Highway and Transport,2004,17(1):38- 42.
[10]  袁伦一.考虑管道反摩擦的预应力钢筋预应力回缩损 失的简化计算[J].公路,2002(5):7-8. YUAN Lunyi.A Simplified Method of Calculation for Loss of Prestress of a Tendon due to Draw-in of Anchorage Counting Counter-friction of a Sheath [J].Highway, 2002(5):7-8.
[11]  邵旭东,夏红波,程翔云.后张连续预应力筋锚固损 失精确计算[J].湖南大学学报:自然科学版, 2008,35(9):15-18. SHAO Xudong,XIA Hongbo,CHENG Xiangyun.Precise Computation of Anchoring Loss in Continuous Prestressed Steel [J].Journal of Hunan University:Natural Science Edition,2008,35(9):15-18.
[12]  丁南宏,钱永久,林丽霞.分批张拉预应力损失的空 间简化计算方法[J].公路交通科技,2006,23 (6):66-68,71. DING Nanhong,QIAN Yongjiu,LIN Lixia.A Simplified Spatial Method to Calculate the Prestressing Loss Caused by Batched Tension Process [J].Journal of Highway and Transportation Research and Development,2006,23 (6):66-68,71.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133