Calculation Model for Long-term Deflection of Prestressed ConcreteBeam with Pretensioned Bent-up Tendons
[1]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]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
36
Number of periods:
2015 02
Page number:
47-51
Column:
Public date:
2015-04-30
- Title:
- Calculation Model for Long-term Deflection of Prestressed ConcreteBeam with Pretensioned Bent-up Tendons
- Keywords:
- prestressed concrete beam with pretensioned bent-up tendons; long-term deflection; creep coeffi-cient ; creep deflection coefficient ; calculation model
- CLC:
- U448.21+7 TU378.1
- 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. .
- References:
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