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Analysis of Flexural Performance and Rational Design of Prestressed UHPC Beam(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2018年02期
Page:
38-46
Research Field:
Publishing date:

Info

Title:
Analysis of Flexural Performance and Rational Design of Prestressed UHPC Beam
Author(s):
LI Li-feng;  FAN Xin;  SHI Xiong-wei;  WANG Lian-hua
College of Civil Engineering, Hunan University
Keywords:
bridge engineering;  UHPC;  flexural performance;  finite element analysis;  rational design
PACS:
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DOI:
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Abstract:
In order to study the basic mechanical performance and rational design method of prestressed ultra-high performance concrete (UHPC) beam，the full process flexural loading test of a large-scale prestressed UHPC-T beam was completed. Nonlinear finite element model of prestressed UHPC beam based on concrete damage plasticity (CDP) model was established, the test process was carefully simulated and the analysis results were compared with the test results. Based on the simulation model, the influences of number of prestressed tendons, tensile stress, compressive and tensile strength of UHPC materials on the flexural properties of UHPC beams were studied. The formula for calculating the prestressed reinforcement ratio of UHPC beam was put forward, and its reasonable range was suggested. The rational design method of UHPC beam was preliminarily discussed. The results show that the finite element model based on the CDP model can better simulate the flexural performance of prestressed UHPC beam. The analysis ]results are in good agreement with the test results. Increasing the prestress can effectively improve the bearing capacity, but reduce the ductility. Increasing the compressive strength of UHPC material has little effect on the mechanical properties at elastic and cracking stages, but can effectively improve the ductility of component. Increasing the tensile strength can effectively improve the crack resistance and ductility of component, and improve the ultimate bearing capacity.

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Last Update: 2018-04-04