高强轻骨料混凝土梁的长期性能试验研究

孙海林; 叶列平; 郭玉顺; 丁建彤

doi:10.13204/j.gyjz200606024

高强轻骨料混凝土梁的长期性能试验研究

doi: 10.13204/j.gyjz200606024

1.
1. 清华大学土木工程系北京 100084;
2.
2. 南京水利科学研究院南京 210029

基金项目:

交通部2002年西部开发交通科技项目(编号:2002-318-767-31)。

详细信息

作者简介:
孙海林男 1978年4月出生博士研究生 E-mail:shl97@mails.tsinghua.edu.cn

中图分类号: TU375.1
计量
- 文章访问数: 79
- HTML全文浏览量: 12
- PDF下载量: 95
- 被引次数: 2
出版历程
- 收稿日期: 2006-02-16
- 刊出日期: 2006-06-20

LONG-TERM DEFLECTION OF HIGH-STRENGTH LIGHTWEIGHT AGGREGATE CONCRETE BEAMS

1.
1. Department of Civil Engineering,Tsinghua University Beijing 100084;
2.
2. Nanjing Hydraulic Research Institute Nanjing 210029

摘要

摘要: 进行了28d强度为60.8MPa和64.4MPa的3根高强轻骨料混凝土梁近1年的长期荷载试验。试验结果表明,在持续荷载作用下,轻骨料混凝土梁的长期变形在初期发展较快,后期发展较慢;受压区配筋能够约束梁的长期变形发展,配筋率越高,长期变形越小。结合编制的混凝土结构长期性能分析程序,基于材料收缩和徐变试验数据,对试验梁进行了计算分析,计算值与试验结果吻合较好。还分别采用几个规范方法对长期挠度增大系数进行了分析,结果表明,ACI318和ACI435方法与试验结果比较吻合,而《混凝土结构设计规范》(GB 50010-2002)与《轻骨料混凝土桥梁技术规程》(报批稿)的计算结果对试验偏于不安全。
- 高强轻骨料混凝土 /
- 长期变形 /
- 收缩 /
- 徐变 /
- 有限元
Abstract: Three high-strength lightweight aggregate concrete (LWAC) beams were experimented for long-term deflections,which lasted for nearly 1 year, with the average 28-day compressive strength 601 8MPa and 6414MPa. From the test results it is observed that long-term deflections developed quickly at early ages and reinforcement ratio for compression steel had a significant effect on time-dependent deflections. Finite element methods had been developed to account for time-dependent deflections of reinforced concrete members and a good agreement was achieved. It isfound that ACI318 and ACI435methodshad resulted in good estimates for the time-dependent deformation and the design methods of current Chinese codes may be unsafe.
- high-strength lightweight aggregate concrete /
- long-term deflection /
- shrinkage /
- creep /
- finite element method