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

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

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[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卷 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

Author(s):: WANG Jun1; 2; KONG Ya-mei1; LIU Li-xin2; 1. Department of Civil Engineering,Xuchang University,Xuchang 461000, China; 2.College of Civil Engineering, ZhengzhouUniversity,Zhengzhou 450001 ,China

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

DOI:: 10.3969/ j. issn.1671 -6833.2015.02.011

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. .

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