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PC box girder creep effect analysis based on ANSYS secondary development

Author: WengYunXin
Tutor: HuDi
School: Central South University
Course: Civil Engineering
Keywords: Prestressed concrete box girder Creep Shear Lag Relaxation ANSYS secondary development Friction Loss
CLC: U448.35;U441
Type: Master's thesis
Year: 2011
Downloads: 157
Quote: 0
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Abstract


For prestressed concrete (PC) box girder, concrete creep will cause stress redistribution caused by beam deformation changes over time cross-section steel and concrete shear lag will result in the same cross-section transverse uneven distribution of stress and additional deformation of the beam. Design, mostly used in the PC box girder structure analysis based on the the truss theory of finite element method, you can not consider shear lag effects. Therefore, based on the powerful ANSYS software secondary development to achieve the PC box girder in ANSYS Analysis of Creep Effect has important practical significance. Summarize concrete creep characteristics described methods and computing theory and Shear Lag Effect analysis methods based on ANSYS secondary development to achieve in ANSYS considering concrete creep and stress relaxation of prestressing tendons, reinforcement characteristics prestressing tendons are positive and negative factors of friction loss, shear lag effect of PC box girder creep analysis. First to ANSYS UPFs secondary development tools, combined with the FORTRAN programming language, in accordance with domestic and international norms of concrete creep characteristics expression, ANSYS provides users creep the subroutine USERCR.F changes, this PC in ANSYS box girder creep basis of the analysis of the effect. Secondly, the initial strain calculation, consider a tensioning the tendons the positive friction effect and anchorage instantly reinforced retraction anti-friction and prestressing tendons by introducing similar creep approach the calculation of the variable stress relaxation, thus with ANSYS can be fully taken into account in the analysis of PC box girder creep effect of prestress loss. Finally, the use of the ANSYS UIDL secondary development tools, and the preparation of the PC box girder creep effect analysis calculation module can be considered concrete creep loss of prestressing tendons stress, shear lag, reinforcement of the PC box girder creep effect analysis, can facilitate the calculation of the stress of the concrete and steel of any moment at any position, beam deformation. Post-secondary development of ANSYS, simply supported PC box girder and PC continuous box girder creep effect analysis, and the calculated results can not consider shear lag effects of bar system FEM calculation results were compared. The comparative analysis shows that, based on secondary development of ANSYS PC box girder creep effect analysis is feasible, reliable calculations can be applied to the calculation of the actual project.

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics
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