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Concrete beam nonlinear model correction method based on response surface method

A technology of nonlinear model and response surface model, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as stress state and later performance prediction

Active Publication Date: 2019-11-22
XIANGTAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for correcting the nonlinear model of concrete beams based on the response surface method in view of the fact that the existing linear material model correction technology cannot accurately predict the current stress state and later performance

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  • Concrete beam nonlinear model correction method based on response surface method
  • Concrete beam nonlinear model correction method based on response surface method
  • Concrete beam nonlinear model correction method based on response surface method

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Embodiment 1

[0055] Embodiment 1: Take a reinforced concrete simply supported beam as an example, such as figure 2 , image 3 As shown, the section size of the simply supported beam is 200mm×400mm, the calculated span is 4.1m, the concrete strength grade is C30, the ordinary steel bar under the force adopts the ribbed steel bar with a diameter of 22mm and HRB335, and the structural steel bar uses a diameter of 8mm, HRB335 Ribbed steel bar, the grid division size is 10cm, a total of 41 units are divided.

[0056] In actual engineering, due to the influence of on-site construction technical conditions, gradual aging of materials, and the decline of effective stress caused by prestress relaxation, the design values ​​and actual values ​​of parameters such as material density, elastic modulus, and component geometric dimensions often exist. Certain difference. Considering that ordinary reinforced concrete structures are very easy to crack and most of them work with cracks, this example anal...

Embodiment 2

[0118] Embodiment two: take a prestressed reinforced concrete beam as an example, as Figure 4 As shown, the calculated span of the prestressed concrete simply supported beam is 8m, the cross-sectional size is 300mm×500mm, the strength grade of the concrete is C50, the ordinary tensile steel bar adopts HRB335 ribbed steel bar with a diameter of 14mm, and the structural steel bar adopts a diameter of 10mm HRB335 ribbed steel bar, the prestressed steel bar adopts the standard tensile strength value of 1860MPa, and the nominal diameter is the prestressed steel bar of 15.24mm, and the grid division size of the simply supported beam in this embodiment is 10cm.

[0119] The specific implementation steps are as follows:

[0120] Step 1: Obtain the measured deflection curve under the load of 40kN in the mid-span of the beam and the measured load-deflection curve under the stepwise loads of 10kN, 20kN, 30kN, 40kN, 50kN, and 60kN in the mid-span of the beam through the static test.

[...

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Abstract

The invention discloses a concrete beam nonlinear model correction method based on a response surface method. The concrete beam nonlinear model correction method comprises the following steps: obtaining a deflection curve under a certain-stage load of a beam or a load-deflection curve at a certain position of the beam through a static test; selecting a proper material constitutive equation; preliminarily screening parameters influencing the constitutive equation of the material as initial to-be-corrected parameters; determining a reasonable parameter value interval of the material constitutiveequation; performing test design on parameters of the material constitutive equation to obtain a sample space of the parameters, and calculating response values corresponding to the sample points through a nonlinear program; determining a response surface model, screening the parameters of the material constitutive equation through variance analysis, and reserving the parameters having significant influence on deflection to fit the response surface equation; performing precision inspection on the fitted response surface equation; and obtaining a correction value of the parameter by using an optimization algorithm to complete nonlinear model correction. The method can be applied to reference model establishment of the nonlinear material beam and beam structure state evaluation.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and in particular relates to a method for correcting a nonlinear model of a concrete beam based on a response surface method. Background technique [0002] Model correction is an important part of the bridge structure health monitoring system. It is a hot research field at home and abroad to invert the working state of the bridge structure according to the collected signal data and establish an accurate finite element model. There is often a certain difference between the calculation results of the finite element model and the experimental test data. The error of the modeling parameters is one of the main reasons, such as the density of the material, the modulus of elasticity, and the geometric size of the component. can be obtained accurately. The correction of the linear material model is an earlier research and more application method. However, the concrete structure has...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 唐盛华简余张学兵秦付倩成鹏杨文轩刘宇翔张佳奇
Owner XIANGTAN UNIV
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