[1]王文炜,翁昌年,杨威.新老混凝土组合梁混凝土收缩徐变试验研究[J].东南大学学报(自然科学版),2008,38(3):505-510.[doi:10.3969/j.issn.1001-0505.2008.03.028]
 Wang Wenwei,Weng Changnian,Yang Wei.Experimental study on creep and shrinkage of old and new concrete composite beams[J].Journal of Southeast University (Natural Science Edition),2008,38(3):505-510.[doi:10.3969/j.issn.1001-0505.2008.03.028]
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新老混凝土组合梁混凝土收缩徐变试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
38
期数:
2008年第3期
页码:
505-510
栏目:
土木工程
出版日期:
2008-05-20

文章信息/Info

Title:
Experimental study on creep and shrinkage of old and new concrete composite beams
作者:
王文炜1 翁昌年2 杨威1
1 东南大学交通学院, 南京 2100096; 2 辽宁省大通公路工程有限公司, 沈阳 116021
Author(s):
Wang Wenwei1 Weng Changnian2 Yang Wei1
1 School of Transportation,Southeast University, Nanjing 210096,China
2 Datong Highway Engineering Co. Ltd., Shenyang 116021, China
关键词:
预应力 新老混凝土组合梁 收缩 徐变 试验研究
Keywords:
prestressing load old and new concrete composite beam shrinkage creep experimental study
分类号:
TU398
DOI:
10.3969/j.issn.1001-0505.2008.03.028
摘要:
进行了预应力作用下新老混凝土组合梁混凝土收缩徐变的试验研究,包括组合梁的挠度-时间曲线、混凝土应变-时间曲线及预应力损失的测定.试验结果表明,由于混凝土的收缩徐变,在预应力作用下组合梁的挠度、混凝土应变、新老混凝土界面间的应变差、截面曲率随时间的增长明显增加.虽然界面间的混凝土应变差值在逐渐增加,但是滑移值较小,界面间的粘结可靠.预应力前期的损失较大,随着时间的增长,损失逐渐减小.采用规范给定的混凝土收缩徐变模型分析了预应力损失.在试验研究的基础上采用随时间变化的换算弹性模量建立了新老混凝土收缩徐变的有限单元法,为了验证建立的有限单元法的正确性,对试验梁进行了分析.计算结果表明,建立的有限单元法与试验值吻合较好.
Abstract:
Two old and new concrete composite beams were tested to investigate the concrete creep and shrinkage under prestressing forces. The deflection-time curves, concrete strain-time curves and prestressed losses were observed. The test results show that the mid-span deflection, concrete strain and curvature are increased with the time extending. The bond between old and new concrete interface is strong enough to prevent interface slip. The prestressing losses are large correspondingly at initial stage and then the prestressing losses are gradually decreased with the time increasing. Based on the code for design of highway reinforced concrete and prestressed concrete bridges and culverts, the prestressing loss is calculated. A FEM(finite element method)is presented using the age adjusted effective modulus. The proposed FE model is compared to experimental beams. The calculated results show that the proposed FEM can predict the long-term structural behavior of composite beams.

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备注/Memo

备注/Memo:
作者简介: 王文炜(1971—), 男, 博士, 副教授, wenwei_wang@163.com.
基金项目: 辽宁省交通厅重点资助项目(0514).
引文格式: 王文炜,翁昌年,扬威.新老混凝土组合梁混凝土收缩徐变试验研究[J].东南大学学报:自然科学版,2008,38(3):505-510.
更新日期/Last Update: 2008-05-20