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Experimental and Theoretical Research on Beams with HRB500High Strength Steel Bars

Author: LiuPing
Tutor: LiuChunYuan
School: Hebei University of Technology
Course: Structural Engineering
Keywords: HRB500steel bar reinforced concrete beam reliability numerical simulation engineering practice
CLC: TU375.1
Type: PhD thesis
Year: 2012
Downloads: 74
Quote: 0
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Abstract


HRB500steel bar is a kind of high strength and strong ductility steel bar. It has a number ofadvantages, such as saving energy and reducing the material consumption. It has been widelyused in developed countries. It has been taken in by Code for design of concretestructures(GB50010-2010). However, the concrete beam with HRB500high strength steel barsmay appear oversized cracks, which can not satisfy the requirement for applicability anddurability. Therefore, it is very meaningful to research the structure with HRB500high strengthsteel bars.The flexural specimens and shear specimens with HRB500high strength steel bars werecarried out. The bearing capacity, failure pattern, crack width and deformation of concrete beamsreinforced with HRB500high strength steel bar were analyzed. Furthermore, comparativeexperimental research on8flexural members added polypropylene fibers was carried out inorder to research the bending capacity, deformation and crack width of beams reinforced bypolypropylene fiber. It is shown that concrete beams reinforced with HRB500high strength steelbar can work well as the common reinforced concrete beams. The bending capacity, shearcapacity, deformation and crack width of polypropylene fiber concrete beams reinforced withhigh strength steel bar can still be calculated according to GB50010-2010and GB50010-2002.Such method as adding polypropylene fiber can enhance anti-crack performance of specimensand reduce the crack spacing and crack width to meet the limits of the maximum crack width.Comparative analysis of reliability based on crack width in serviceability limit statebetween reinforced concrete with HRB500reinforcements and members reinforced bypolypropylene fibers. The analysis results indicate that reliability indexs based on crack width inserviceability limit state of reinforced concrete with HRB500reinforcements is low andreliability index of the others is promoted with polypropylene fibers.Adopting the finite element method to analyze the polypropylene fibers reinforced concretebeam was the further studied. The3-D finite element model was established and nonlinear finiteelement method was used to analyze the mechanical process of polypropylene fibers concrete beam.The numerical results of ultimate montion, load-deflection curve and load-steel stresscurve showed good agreement with the experimental results. It is indicates that nonlinear finiteelement method can effectively simulate the flexural polypropylene fibers concrete beam.Based on the experiment of beams with HRB500high strength steel bars, it has beenapplied to engineering practice. The demonstration project of Hebei province constructionservice center were built up and filed test and economical benefits analysis were done. TheHRB500steel bars are applied in foundation project of school of Civil Engineering HebeiUniversity of Technology. It is shown that the HRB500steel bar has economic, social benefitsand extremely wide application prospect.

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Reinforced concrete structures > Girder
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