Device for Time-Varying Mechanical Performance of Columns under Coupling Effects of Load and Environment

2014 ◽  
Vol 578-579 ◽  
pp. 1567-1570
Author(s):  
Qiang Li ◽  
Jian Jiang ◽  
Jing Tong
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Performance ◽  
Coupling Effect ◽  
Reinforced Concrete Structures ◽  
Time Varying ◽  
Measuring Instrument ◽  
Analog Device ◽  
Measuring Systems ◽  
Sustained Loading ◽  
Rebar Corrosion

To study the durability of reinforced concrete structures under coupling effect of load and environmental, an analog device is developed. Device includes sustained loading, accelerated environmental corrosion and measuring systems. The load applied to the column is real-time monitored by the pressure sensor and compensated according to the stiffness degradation and stress relaxation of column due to the rebar corrosion. Electrode is placed in the column so that the arrangement of the measuring instrument is not restricted. Device successfully realizes monitoring the time-varying mechanical performance degradation of reinforced concrete under the coupling effect of load and environment.

Reliability Analysis of Reinforced Concrete Structural during Construction

2011 ◽  
Vol 71-78 ◽  
pp. 310-314
Author(s):  
Jun Zhao
Keyword(s):  
Reinforced Concrete ◽  
Stochastic Analysis ◽  
Reliability Index ◽  
Structural Reliability ◽  
Reinforced Concrete Structures ◽  
Time Varying ◽  
Calculation Algorithm ◽  
Random Field Theory ◽  
Reliability Calculation ◽  
Practical Engineering

According to random field theory, combined with the construction of the characteristics of reinforced concrete structures, based on the geometric significance of the reliability index, the optimization algorithm of the reliability was established, and the reliability calculation algorithm of reinforced concrete structural during construction is proposed based on stochastic finite element method. Based on a stochastic analysis of the practical engineering, the time-varying laws of the reinforced concrete structural reliability index during construction are concluded.

Research on Corrosion of Reinforced Concrete Structures by Chloridion in Port Engineering Construction

2011 ◽  
Vol 90-93 ◽  
pp. 2483-2486 ◽  
Author(s):  
Yan Ying Dong ◽  
Li Shan Zhang ◽  
Ming Zhang ◽  
Tian Zhi Zhu
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Raw Materials ◽  
Concrete Structures ◽  
Raw Material ◽  
Reinforced Concrete Structures ◽  
Engineering Construction ◽  
Rebar Corrosion ◽  
The Right ◽  
Port Engineering

In port engineering construction, the source of chloridion is concrete raw materials, admixtures and the penetration of seawater. Chloridion makes rebar corrosion, and makes the expansion and crack of reinforcement concrete, leading to concrete structural damage. By selecting the right concrete raw material, appropriate admixtures and to ensure concrete construction quality, in order to effectively avoid chloridion to the damage of reinforced concrete structures in construction.

scholarly journals Cover cracking model in reinforced concrete structures subject to rebar corrosion

2014 ◽  
Vol 15 (7) ◽  
pp. 496-507 ◽  
Author(s):  
Zhi Wang ◽  
Xian-yu Jin ◽  
Nan-guo Jin ◽  
Xiang-lin Gu ◽  
Chuan-qing Fu
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Cover Cracking ◽  
Rebar Corrosion

Rebar corrosion detection, protection, and rehabilitation of reinforced concrete structures in coastal environments: A review

2019 ◽  
Vol 224 ◽  
pp. 1026-1039 ◽  
Author(s):  
Amala James ◽  
Ehsan Bazarchi ◽  
Alireza A. Chiniforush ◽  
Parinaz Panjebashi Aghdam ◽  
M. Reza Hosseini ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Coastal Environments ◽  
Corrosion Detection ◽  
Rebar Corrosion

scholarly journals Compressive Performance of Corroded Reinforced Concrete Columns

2020 ◽  
Vol 38 (11A) ◽  
pp. 1618-1628
Author(s):  
Mushtaq S. Radhi ◽  
Maan Hassan ◽  
Iqbal Gorgis
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Performance ◽  
Load Capacity ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Concrete Columns ◽  
Small Scale ◽  
Uniaxial Compression Test ◽  
Reinforced Concrete Structures ◽  
Reinforced Concrete Columns

Corrosion of reinforcement has been identified as the deterioration mechanism of reinforced concrete structures, which seriously affects the safety and integrity of structures. The corrosion of the embedded reinforcing steel in concrete is a major problem facing civil engineers today, which initiates 80% of the reinforced concrete structures deterioration. This paper reveals the outcomes of an experimental investigation on the mechanical performance (residual strength) of circular steel reinforced columns which have been damaged by corrosion of the steel rebar. Small scale circular reinforced concrete columns with a diameter of 100 mm and 300 mm in height were adopted.  Different rates of steel reinforcement mass loss (corrosion damage) ranged between 10%, 20% to 30 % were created in the columns by using a galvanostatic accelerated corrosion method combined with wetting-drying cycles. The uniaxial compression test was implemented for damaged columns up to failure. Based on the experimental outcomes, it was revealed that the corrosion damage had substantially reduced the performance of columns. The decrement of the load capacity of corroded columns ranged between 19% to 40% and for corrosion, level ranged from 10% to 30%, respectively. The decrement of the final deformation of corroded columns ranged between 15% to 30% and for corrosion, level ranged from 10% to 30%, respectively. Likewise, the failure mode and relationship between the stress and strain for corroded columns had been adversely affected by corrosion.

scholarly journals Study of epoxy composites and sisal fibers as reinforcement of reinforced concrete structure

2019 ◽  
Vol 12 (2) ◽  
pp. 255-287
Author(s):  
H. M. FRANCKLIN ◽  
L. A. C. MOTTA ◽  
J. CUNHA ◽  
A. C. SANTOS ◽  
M. V. LANDIM
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Performance ◽  
Concrete Structures ◽  
Experimental Program ◽  
Reinforced Concrete Structures ◽  
Reinforced Concrete Structure ◽  
Structural Reinforcement ◽  
Reinforced Beams ◽  
Load Increase ◽  
Sisal Fibers

Abstract The application of structural reinforcement has presented a significant growth in the present days. The development of new materials for this purpose has aroused the interest of many researchers. The present work aim evaluate the production and application of polymers reinforced with vegetable fibers (PRFVeg) for reinforcement of reinforced concrete structures. An experimental program was developed using composites with 50%, 60% and 70% fibers volume content. The composites’s tensile mechanical properties were evaluated in order to choose the fiber content with better mechanical performance. Epoxy matrix and sisal fibers were adopted in the production of PRFVeg. The reinforcement design was performed by numerical simulation using the finite element method. The reinforced beams were submitted to a 3-point flexural test until rupture and the performance of the material produced was compared to carbon fiber reinforced epoxy (PRFC) composites commonly used as reinforcement of reinforced concrete structures. The results obtained showed that the PRFVeg present similar performance compared to composites reinforced with carbon fibers, obtaining a load increase of up to 62% compared to the beams without polymer reinforcement.

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