scholarly journals DETERMINATION OF THE MODAL PARAMETERS OF A FIVE STORY REINFORCED CONCRETE STRUCTURE USING ULTRA-LOW LEVEL EXCITATION AND COMPUTATIONAL ANALYSIS

2012 ◽  
Author(s):  
Adam Russell Rendon
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Computational Analysis ◽  
Modal Parameters ◽  
Reinforced Concrete Structure ◽  
Low Level

Calculation Models of the Bearing Capacity of Span Reinforced Concrete Structure Support Zones

2019 ◽  
Vol 968 ◽  
pp. 209-226
Author(s):  
Vasyl M. Karpiuk ◽  
Yulia A. Syomina ◽  
Diana V. Antonova
Keyword(s):  
Reinforced Concrete ◽  
Crack Resistance ◽  
Cross Sections ◽  
Concrete Structure ◽  
Strain State ◽  
Complex Stress ◽  
Deformation Analysis ◽  
Reinforced Concrete Structures ◽  
Reinforced Concrete Structure

Experience gained in design, erection and operation of span reinforced concrete structures has proved that practically all of them are subject to complex stress-strain state. At that, the researchers pay considerable greater attention to calculation of strength, deformation analysis and determination of crack resistance in normal cross-sections than to calculation of their support zones, including oblique sections, which results are generally taken into account for determining the section dimensions and the quantity of the cross reinforcement.

Determination of Thermography Modes for Recording Delamination between Composite Material and Reinforced Concrete Structures

2015 ◽  
Vol 243 ◽  
pp. 97-104 ◽  
Author(s):  
A. Bykov ◽  
I. Shardakov ◽  
A. Shestakov
Keyword(s):  
Composite Material ◽  
Reinforced Concrete ◽  
Concrete Structure ◽  
Fiber Composite ◽  
Thermal Response ◽  
Operating Conditions ◽  
Reinforced Concrete Structure ◽  
Ir Thermography ◽  
Fiber Sheet

This paper presents the results of experimental and theoretical studies justifying the possibility of using infrared (IR) thermography for detection of deformation debonding of composite material from a reinforced concrete structure that occurs under operating conditions and develops according to the cohesion scenario. The analysis of the results allowed us to determine the optimal inspection parameters of IR thermography to assure best registration of the presence of fiber composite material debonding from the surface of a concrete structure. It has been found that the most accurate and timely information about debonding in a carbon fiber sheet/epoxy/concrete/delamination/concrete system can be obtained during the cooling stage after pulse heating of the structure surface, since at this stage the magnitude of thermal response to debonding reaches its maximum.

Test and Study on Impact of Corrosion on Bond Force between Steel and Concrete

2010 ◽  
Vol 36 ◽  
pp. 176-181
Author(s):  
Xian Feng He ◽  
Shou Gang Zhao ◽  
Yuan Bao Leng
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Concrete Structure ◽  
Steel Corrosion ◽  
Reinforced Concrete Structure ◽  
Bond Force ◽  
Steel Bars ◽  
Protection Layer ◽  
Corrosion Of Steel ◽  
The Impact

The corrosion of steel will have a bad impact on the safety of reinforced concrete structure. In severe cases, it may even be disastrous. In order to understand the impact of steel corrosion on the structure, tests are carried out to study corrosion and expansion rules of steel bars as well as the impact rules of corrosion on bond force between steel and concrete. The results show that wet and salty environment will result in steel corrosion; relatively minor corrosion will not cause expansion cracks of protection layers; when steel rust to a certain extent, it will cause cracks along the protection layer; when there exists minor corrosion in steel and the protection layer does not have expansion cracks, the bond force is still large and rapidly decreases as the corrosion rate increases.

Assessment of the aftertreatment quality of concrete

2021 ◽  
Author(s):  
Lisa Ptacek ◽  
Alfred Strauss ◽  
Clémence Bos ◽  
Martin Peyerl
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Test Methods ◽  
Reinforced Concrete Structure ◽  
Process Step ◽  
Simple Tool ◽  
Lack Of Control ◽  
Complex Construction

<p>The curing of concrete is extremely important for the durability of a reinforced concrete structure. In practice, due to the complex construction processes, the very limited phases and the lack of control, aftertreatment is often neglected by executing companies. Hence infrastructure operators are therefore very interested in having a robust, simple tool that enables aftertreatment to be easily checked and, as a result, to convey the importance of this process step to the client. In the project presented here, classic and novel test methods are presented and discussed, as well as their suitability for the detection of the aftertreatment quality on laboratory samples and subsequently on some real structures.</p>

scholarly journals Numerical Analysis of a Moderate Fire inside a Segment of a Subway Station

2018 ◽  
Vol 8 (11) ◽  
pp. 2116 ◽  
Author(s):  
Rodrigo Díaz ◽  
Hui Wang ◽  
Herbert Mang ◽  
Yong Yuan ◽  
Bernhard Pichler
Keyword(s):  
Reinforced Concrete ◽  
Surface Temperature ◽  
Concrete Structure ◽  
Fire Test ◽  
Material Behavior ◽  
Sensitivity Analyses ◽  
Subway Station ◽  
Elastic Model ◽  
Reinforced Concrete Structure ◽  
Actual Distribution

A 1:4 scaled fire test of a segment of a subway station is analyzed by means of three-dimensional Finite Element simulations. The first 30 min of the test are considered to be representative of a moderate fire. Numerical sensitivity analyses are performed. As regards the thermal boundary conditions, a spatially uniform surface temperature history and three different piecewise uniform surface temperature histories are used. As regards the material behavior of concrete, a temperature-independent linear-elastic model and a temperature-dependent elasto-plastic model are used. Heat transfer within the reinforced concrete structure is simulated first. The computed temperature evolutions serve as input for thermomechanical simulations of the fire test. Numerical results are compared with experimental measurements. It is concluded that three sources of uncertainties render the numerical simulation of fire tests challenging: possible damage of the structure prior to testing, the actual distribution of the surface temperature during the test and the time-dependent high-temperature behavior of concrete. In addition, the simulations underline that even a moderate fire represents a severe load case, threatening the integrity of the reinforced concrete structure. Tensile cracking is likely to happen at the inaccessible outer surface of the underground structure. Thus, careful inspection is recommended even after non-catastrophic fires.

scholarly journals Determination of the neutralization depth of concrete under the aggressive environment influence

2018 ◽  
Vol 33 ◽  
pp. 02010 ◽  
Author(s):  
Anastasia Morzhukhina ◽  
Stanislav Nikitin ◽  
Elena Akimova
Keyword(s):  
Reinforced Concrete ◽  
Chloride Ions ◽  
The Body ◽  
Chemical Plants ◽  
Reinforced Concrete Structure ◽  
Load Bearing Capacity ◽  
High Rise ◽  
Capacity Loss ◽  
Air Penetration

Aggressive environments have a significant impact on destruction of many reinforced concrete structures, such as high-rise constructions or chemical plants. For example, some high-rise constructions are equipped with a swimming pool, so they are exposed to chloride ions in the air. Penetration of aggressive chemical substances into the body of concrete contributes to acceleration of reinforced concrete structure corrosion that in turn leads to load bearing capacity loss and destruction of the building. The article considers and analyzes the main technologies for calculating penetration depth of various aggressive substances into the body of concrete. The calculation of corrosion depth was made for 50-year service life.

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