再生混凝土梁正截面裂缝宽度计算方法研究

基金项目:

陕西省教育厅专项科研项目(2013JK0973);中国博士后科学基金资助项目(2013M532022);国家科技支撑计划项目(2008-BAK48B05)

STUDY ON CRACK WIDTHS OF NORMAL SECTIONS OF RECYCLED CONCRETE BEAMS

1.
1. School of Science,Xi’an University of Architecture &Technology,Xi’an 710055,China;
2.
2. School of Civil Engineering,Xi’an University of Architecture &Technology,Xi’an 710055,China;
3.
3. Post-Doctoral Research Station of Materials Science and Engineering,Xi’an University of Architecture &Technology,Xi’an 710055,China;
4.
4. Shenzhen Construction Group Company,Shenzhen 518048,China;
5.
5. Department of Civil and Materials Engineering,Henan University of Urban Construction,Pingdingshan 467036,China

摘要: 通过短期荷载作用下再生混凝土梁裂缝宽度试验，分析再生混凝土裂缝开展机理与宽度影响因素，对比再生混凝土与普通混凝土构件裂缝开展机理异同。以黏结滑移理论为基础，结合试验拟合系数，建立再生混凝土构件正截面裂缝最大宽度计算公式。研究结果表明：再生骨料取代率并不是影响再生混凝土裂缝宽度的主要因素，其裂缝整体分布呈现离散性高的特点。通过对多组试验结果反算，验证建议公式的计算精度满足设计要求。
- 再生混凝土 /
- 裂缝宽度 /
- 黏结滑移
Abstract: Based on the crack widths of normal sections of recycled concrete beams under short term loading, the similarities and differences between normal concrete and recycled concrete were compared.It was focused on the crack developing mechanism and width influencing factors of recycled concrete crack.The expression of flexural crack width of recycled concrete beams was presented based on the bond-slip theory and the experiments result.The results showed that the recycled aggregate replacing rate was the extraessential factor of recycled concrete crack, and high discreteness was the main features.The calculation precision of the crack width formula was proved sufficient to meet the demand of design by the test results.
- recycled concrete /
- crack width /
- bond-slip