Method of constructing new and old concrete bond constraint shrinkage finite element model

A new and old concrete, construction method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as easy cracking, affecting structural bearing capacity and durability

Inactive Publication Date: 2015-12-02
FUJIAN JIANGXIA UNIV
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Problems solved by technology

If the tensile stress exceeds the tensile strength of new concrete or the bonding strength of new and old

Method used

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  • Method of constructing new and old concrete bond constraint shrinkage finite element model
  • Method of constructing new and old concrete bond constraint shrinkage finite element model
  • Method of constructing new and old concrete bond constraint shrinkage finite element model

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0062] Please refer to figure 1 , the present invention provides a method for constructing a finite element model of new and old concrete bonding constrained shrinkage, comprising the following steps:

[0063] Step S1: if figure 1 Shown is the finite element model schematic diagram of the present invention, utilizes the linear reduction integral unit (C3D8R) in ABAQUS finite element software to set up new and old concrete models, in order to ensure the unit size of the described new and old concrete models of the accuracy of calculation is 10mm.

[0064] Step S2: In the new and old concrete model, the new concrete and the old concrete are connected by defining contact, and the bond-slip between the new concrete 1 and the old concrete 2 is not considered, and a binding constraint (tie) is used to simulate the bond, so The contact properties of the bind...

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Abstract

The invention relates to a method of constructing a new and old concrete bond constraint shrinkage finite element model. The method includes the following steps that a new and old concrete model is built through a linear shrinkage integral unit in ABAQUS finite element software; new concrete is associated with old concrete through definition contact in the new and old concrete model, bond slip between the new concrete and the old concrete is not considered, and bond is simulated through binding constraint; the creep coefficient of the concrete is determined; the change of elasticity modulus along with the age of the concrete is calculated; the bond face of the new concrete is defined to be an auxiliary face in the model, the bond face of the old concrete is defined to be a main face, the shrinkage value is converted into equivalent temperature difference, and calculation is conducted on the new concrete through action of the form of a temperature field. The model constructed by the method can provide a practical analysis model for researches on stress and deformation generated in the new and old concrete bond shrinkage process in reinforcing engineering.

Description

technical field [0001] The invention relates to a method for constructing a finite element model of bonded constrained shrinkage of old and new concrete. Background technique [0002] In the concrete structure, the shrinkage of concrete is an inevitable phenomenon, which refers to the reduction of the volume of the concrete due to deformation under the condition of no force. When the concrete structure is in a free state, such shrinkage is not harmful. However, in the actual reinforcement project, the new and old concrete are bonded to each other, and the shrinkage of the old concrete has basically stopped. If the newly poured concrete shrinks, it will be restrained by the old concrete and cause tensile stress. If the tensile stress exceeds the tensile strength of new concrete or the bonding strength of new and old concrete, cracks will easily occur, which will affect the bearing capacity and durability of the structure. Therefore, it is necessary to establish a simple and...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 陈峰
Owner FUJIAN JIANGXIA UNIV
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