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A Finite Element Simulation Method of Bonding Behavior Between Prestressed Beam and Concrete

A technology of prestressed beam and bonding performance, which can be used in instruments, measuring devices, mechanical devices, etc., and can solve the problems of high testing cost and difficulty in meeting actual needs.

Active Publication Date: 2020-05-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In different structures, the number and spatial arrangement of the steel strands in the prestressed bundles are different, and it is too costly to test the bonding performance of various prestressed bundles entirely by tests, and it is difficult to meet the actual needs

Method used

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  • A Finite Element Simulation Method of Bonding Behavior Between Prestressed Beam and Concrete
  • A Finite Element Simulation Method of Bonding Behavior Between Prestressed Beam and Concrete
  • A Finite Element Simulation Method of Bonding Behavior Between Prestressed Beam and Concrete

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Embodiment Construction

[0071] Now using the technology of the present invention to the document "Secondary anchorage in post-tensionedbridge systems, Elie El Zghayar, Kevin R. Mackie. ACI Structural Journal. 2013, 110(4): 629-638." The effective bond length is The 470mm prestressed beam specimen was simulated. The simulation method of this example includes the following steps:

[0072] Step 1: Build a geometric model.

[0073] 1) Determine the geometric parameters of the structure. The geometric size of the test piece is 470mm×1981mm×610mm, using (Seven strands) steel strand, the extension length of the tension end is 250mm, and the extension length of the free end is 100mm. The specimen adopts a concrete cuboid with a strength of C50, a grouting material with a strength of 50MPa and ordinary steel bars of HRB400. The section characteristics and main parameters of the specimen are detailed in Image 6 , The mechanical properties of concrete and steel strands are shown in Table 1.

[0074] 2) Using ANSY...

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Abstract

The invention discloses a finite element modeling method of binding performance between prestress beam and concrete, and presents a prestress beam binding slippage equivalent modeling method. The finite element modeling method includes steps of firstly, presenting a confirming principle of an overall slippage face and an effective working face of the prestress beam, building up an interface micro-unit stress balance relationship of the prestress beam, and presenting the calculating method of the prestress beam extreme binding force; secondly, providing an equivalent principle of the prestressbeam extreme binding force, and accordingly deducing the calculating formula of the equivalent maximum binding stress of single prestress rib; updating the BPE binding slippage model and making clearthe property of a spring unit of the molding binding slippage; realizing the finite element modeling of the equivalent binding slippage of single prestress rib. On this basis, the finite element modeling method of prestress beam binding slippage is realized according to the principle of acquiring prestress beam binding force by overlapping the equivalent binding force of single prestress rib and using the average slippage of single prestress rib as the prestress beam slippage. Finally, the precision of the method is verified by combining with the existing testing result.

Description

Technical field [0001] The invention relates to a finite element simulation analysis method, in particular to a finite element simulation method for the bonding performance between prestressed strands and concrete. Background technique [0002] As prestressed concrete structures are widely used in major projects, their safety problems have become more and more prominent. The bonding performance between prestressed tendons and concrete is an important factor affecting the safe use of structures. The bonding performance of the steel bar and concrete in the structure depends on the steel bar diameter and the surface geometric characteristics of the steel bar. At present, a large number of simulation studies have been carried out on the bonding performance of ordinary steel bars in the structure, and the related methods are relatively mature. However, the prestressed tendons in the structure mostly use twisted steel strands, and the bonding performance of this twisted steel strand i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/04
Inventor 王磊袁平张旭辉张建仁
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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