Influence of the cracking moment of two reinforced concrete beams obtained through fiber optic sensors in the determination of their instant deflections = Influencia del momento de fisuración de dos vigas de hormigón armado obtenido mediante sensores de fibra óptica en la determinación de sus flechas instantáneas

Abstract This article presents the materials of deformability studies of pre-stressed steel-concrete beams reinforced with a package of reinforcement with different ratio of tape and rebar in the pure bending moment zone. The aim of the research was determination of the reinforcement percentage influence, for pre-stressed reinforced concrete beams reinforced with a package of reinforcement on their deformability. Also, the aim was to evaluate the effectiveness of using pre-stressed rebar in combined reinforcement. The practical significance of the experimental research is to study the deformability in pre-stressed bending elements with external tape and rebar reinforcement, taking into account the influence of different ratios of reinforcement areas within the combined reinforcement and development of proposals for such structures` calculation and design. The scientific novelty of the research is in obtaining the deformability characteristics of reinforced concrete beams reinforced with a package of reinforcement (tape and steel bars with periodic profile) with different ratios in the case of static loads` action.

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Calculation of steel-reinforced concrete beam for instant loading taking into account the non-linearity of the concrete diagram ε-σ

Вестник гражданских инженеров ◽

10.23968/1999-5571-2020-17-2-85-94 ◽

2020 ◽

Vol 17 (2) ◽

pp. 85-94

Author(s):

S. O. Chepilko ◽

Keyword(s):

Reinforced Concrete ◽

Concrete Beam ◽

Concrete Beams ◽

Reinforced Concrete Beam ◽

Neutral Axis ◽

Reinforced Concrete Beams ◽

System Of Equations ◽

Nonlinear System Of Equations ◽

Steel Reinforced Concrete

Issues of calculating steel-reinforced concrete beams are considered taking into account a nonlinear concrete diagram based on the Sargin formula. The nonlinear system of equations for determination of curvature and neutral axis, which is solved numerically, is written in explicit form. Explicit expressions for determination of other calculated quantities needed for design of steel-reinforced concrete beams are derived. Numerical examples are given. The analysis of accounting nonlinearity in comparison with the linear calculation is carried out.

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Damage Assessment of Reinforced Concrete Beams by Complex Ratios of Transfer Functions

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.321-323.357 ◽

2006 ◽

Vol 321-323 ◽

pp. 357-362 ◽

Cited By ~ 1

Author(s):

Chih Peng Yu ◽

Chia Chi Cheng ◽

Chih Hung Chiang

Keyword(s):

Reinforced Concrete ◽

Transfer Functions ◽

Concrete Beams ◽

Field Tests ◽

High Sensitivity ◽

Reinforced Concrete Beams ◽

Numerical Studies ◽

Complex Ratio ◽

Local Defects

In this paper, a newly developed approach for the determination of characteristics associated with local defects of a beam is briefly introduced. From the numerical studies carried out in this study, the complex ratio between two transfer functions associated with an imaginary intact beam and a damaged beam can provide such information. Based on the numerical studies, the rules in determining degree of damages and locations of defects were first briefly outlined. These idealized rules were then verified by experimental data obtained from dynamic tests of realistic specimens of simply-supported reinforced concrete beams. The preliminary results indicate that the defined ratio of transfer functions can potentially serve as an exaggerated indication for the degree of changes in certain modal responses. Thus, the proposed ratio of transfer functions can be used to assist system identification, while the nature of high sensitivity also restricts its direct application to certain complicated data associated with field tests. A variety of test setup for both receivers and impact sources were studied and the test results appear to agree with designated conditions of the specimens.

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