# [1]王俊孔亚美刘立新.折线先张法预应力混凝土梁 长期挠度实用计算公式[J].郑州大学学报(工学版),2015,36(02):47-51.[doi:10.3969/ j. issn.1671 -6833.2015.02.011] 　WANG Jun,KONG Ya-mei,LIU Li-xin.Calculation Model for Long-term Deflection of Prestressed ConcreteBeam with Pretensioned Bent-up Tendons[J].Journal of Zhengzhou University (Engineering Science),2015,36(02):47-51.[doi:10.3969/ j. issn.1671 -6833.2015.02.011] 点击复制 折线先张法预应力混凝土梁 长期挠度实用计算公式() 分享到： var jiathis_config = { data_track_clickback: true };

36卷

2015年02期

47-51

2015-04-30

## 文章信息/Info

Title:
Calculation Model for Long-term Deflection of Prestressed ConcreteBeam with Pretensioned Bent-up Tendons

1.许昌学院土木工程学院,河南许昌461000;2.郑州大学土木工程学院,河南郑州450001
Author(s):
1. Department of Civil Engineering,Xuchang University,Xuchang 461000, China; 2.College of Civil Engineering, ZhengzhouUniversity,Zhengzhou 450001 ,China

Keywords:

U448.21+7 TU378.1
DOI:
10.3969/ j. issn.1671 -6833.2015.02.011

A

Abstract:
Precisely predicting the long term deflection is one of the most important advantages of prestressedconcrete beam with pretensioned bent-up tendons. By loading three prestressed concrete beams with preten-sioned bent-up tendons in a long term,the mid-span deflection and section creep strain were studied. Togetherwith the numerical relationship expression between creep coefficient and creep deflection coefficient which wasestablished earlier,the numerical relationships among creep coefficient,long-term deflection coefficient,andcreep deflection coefficient were further studied. The results show that: The value of the long-term deflectioncoefficient is 1.1 times that of the creep coefficient. Finally,a practical expression was derived for calculatingthe long-term deflection of prestressed concrete beam with pretensioned bent-up tendons,which took a numberof influencing factors into consideration ,such as concrete shrinkage,concrete creep,partially prestressed rati-os,the axial compression and the moment value due to prestressing，component equivalent sectional area andthe section modulus of bending，etc. .