scholarly journals Performance of piezoceramic sensors

2021 ◽  
Author(s):  
Rummaan Syed Ahmed
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Large Scale ◽  
Failure Modes ◽  
Concrete Strength ◽  
Small Scale ◽  
Active Monitoring ◽  
Concrete Members ◽  
Concrete Crack ◽  
Base Width

This study is in continuation of the previous research conducted at Ryerson University to develop a model for active monitoring of reinforced concrete members using piezo-ceramic sensor. In the previous research large concrete beam were investigated. The following study examines the performance of piezo-ceramic sensor to monitor maturity of concrete and to evaluate crack width of large base width concrete plates. Small scale beams and large scale slabs specimens were tested under three and four points bending respectively to evaluate the effectiveness of piezo-sensors at different failure modes. Test results from small scale beams were used to model correlation between concrete crack width/strains and sensor signals. The test result indicated that piezo-sensor can be used for active concrete strength monitoring at later stages. It can also be used as an effective indicator of crack width for reinforced concrete members with small base width.

scholarly journals Performance of piezoceramic sensors

2021 ◽  
Author(s):  
Rummaan Syed Ahmed
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Large Scale ◽  
Failure Modes ◽  
Concrete Strength ◽  
Small Scale ◽  
Active Monitoring ◽  
Concrete Members ◽  
Concrete Crack ◽  
Base Width

This study is in continuation of the previous research conducted at Ryerson University to develop a model for active monitoring of reinforced concrete members using piezo-ceramic sensor. In the previous research large concrete beam were investigated. The following study examines the performance of piezo-ceramic sensor to monitor maturity of concrete and to evaluate crack width of large base width concrete plates. Small scale beams and large scale slabs specimens were tested under three and four points bending respectively to evaluate the effectiveness of piezo-sensors at different failure modes. Test results from small scale beams were used to model correlation between concrete crack width/strains and sensor signals. The test result indicated that piezo-sensor can be used for active concrete strength monitoring at later stages. It can also be used as an effective indicator of crack width for reinforced concrete members with small base width.

scholarly journals Axial Compressive Strength Models of Eccentrically-Loaded Rectangular Reinforced Concrete Columns Confined with FRP

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3498
Author(s):  
Haytham F. Isleem ◽  
Muhammad Abid ◽  
Wesam Salah Alaloul ◽  
Muhammad Kamal Shah ◽  
Shayan Zeb ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Practice Research ◽  
Small Scale ◽  
Technical Literature ◽  
Rc Columns ◽  
Strength Models

The majority of experimental and analytical studies on fiber-reinforced polymer (FRP) confined concrete has largely concentrated on plain (unreinforced) small-scale concrete columns, on which the efficiency of strengthening is much higher compared with large-scale columns. Although reinforced concrete (RC) columns subjected to combined axial compression and flexural loads (i.e., eccentric compression) are the most common structural elements used in practice, research on eccentrically-loaded FRP-confined rectangular RC columns has been much more limited. More specifically, the limited research has generally been concerned with small-scale RC columns, and hence, the proposed eccentric-loading stress-strain models were mainly based on the existing concentric-loading models of FRP-confined concrete columns of small scale. In the light of such demand to date, this paper is aimed at developing a mathematical model to better predict the strength of FRP-confined rectangular RC columns. The strain distribution of FRP around the circumference of the rectangular sections was investigated to propose equations for the actual rupture strain of FRP wrapped in the horizontal and vertical directions. The model was accomplished using 230 results of 155 tested specimens compiled from 19 studies available in the technical literature. The test database covers an unconfined concrete strength ranging between 9.9 and 73.1 MPa, and section’s dimension ranging from 100–300 mm and 125–435 mm for the short and long sides, respectively. Other test parameters, such as aspect ratio, corner radius, internal hoop steel reinforcement, FRP wrapping layout, and number of FRP wraps were all considered in the model. The performance of the model shows a very good correlation with the test results.

Concrete Strength and Deformation Property under Sea Water Erosion Environment

2012 ◽  
Vol 446-449 ◽  
pp. 2554-2559 ◽  
Author(s):  
Jian Jun Cai ◽  
Feng Zhang ◽  
Wei Cui ◽  
Shou Shan Chen ◽  
Pu Lun Liu
Keyword(s):  
Large Scale ◽  
Failure Modes ◽  
Deformation Property ◽  
Sea Water ◽  
Dynamic Stiffness ◽  
Concrete Strength ◽  
Strain Curve ◽  
Water Erosion ◽  
Strength And Deformation ◽  
Erosion Environment

In order to effectively assess the concrete strength and deformation property under sea water erosion environment, concrete stress and strain curve was researched with the number of wet and dry cycle of 0 times, 10 times , 20 times, 30 times, 40 times, 50 times and 60 times based on the large-scale static and dynamic stiffness servo test set. The stress - strain curves of concrete was tested for the lateral pressure 10.8MPa, 14.4MPa, and 18.8MPa at different dry-wet cycles, The failure modes and superficial cracking characteristics of specimens are reported at different dry-wet cycles. Concrete elastic modulus and compressive strength were researched. Based on concrete mechanical theory , the classic Kufer-Gerstle strength criteria of concrete was used, a large number of test samples of multivariate data were nonlinear regressed, a biaxial concrete strength criterion was established taking into account the stress ratio and the number of dry-wet cycles.

scholarly journals Experimental study of the influence of crack width due to corrosion behaviour using different measurement methods and different exposures

2019 ◽  
Vol 289 ◽  
pp. 08005
Author(s):  
Martin Schneider ◽  
Georg Gardener
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Corrosion Behaviour ◽  
Concrete Strength ◽  
Concrete Structures ◽  
Chloride Ions ◽  
Reinforced Concrete Structures ◽  
Reinforcing Steel ◽  
Surface Corrosion ◽  
Potential Mapping

Corrosion of reinforcing steel has a great influence in reducing the lifetime of concrete structures; Carbonation of the concrete pore solution causes surface corrosion on the steel and diffusion of chloride ions through the capillary system of the concrete cover causes pitting corrosion on the steel surface. Corrosion of metals is highly dependent on the environmental conditions. Exposure to chloride ions can be critical to the service life of reinforced concrete structures. The durability of reinforced concrete structures exposed to deicing salt or marine environments can be affected by impact of chloride ions. Detection methods for the rate of corrosion of non-destructive and destructive procedures were analysed. The potential mapping applied on the concrete surface was discussed as a standard method for corrosion detection and will be explained in detail including the application boundaries of the method. It is assumed that the corrosion behaviour of reinforcing steel depends on crack widths. To analyse that, 8 coated and 8 uncoated test samples with different concrete strength classes were used. The concrete objects were exposed to a 3% sodium chloride solution. The corrosion behaviour of reinforcing steel is analysed by using potential mapping with different reference electrodes (Ag/AgCl and Cu/CuSO4). The results show a significant correlation between crack size and protection system on the surface. The maximum crack width with a low indication of corrosion was found to be 0.1 mm.

Cracking behaviour of concrete beams reinforced with fiber reinforced plastic rebars

1996 ◽  
Vol 23 (6) ◽  
pp. 1172-1179 ◽  
Author(s):  
R. Masmoudi ◽  
B. Benmokrane ◽  
O. Chaallal
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Concrete Beams ◽  
Reinforcement Ratio ◽  
Test Results ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Concrete Members ◽  
Reinforced Plastic ◽  
Cracking Pattern

This paper presents the results of an experimental investigation on the cracking behaviour of concrete beams reinforced with fiber reinforced plastic rebars. The effects of reinforcement ratio on the cracking pattern, crack spacing, cracking moment, and crack width are investigated. The test results indicate that the reinforcement ratio has no meaningful effect on the cracking moment, which can be calculated as recommended by the ACI code. Also, the use of the equations adopted by ACI and the European codes for the prediction of crack width of conventionally reinforced concrete members is investigated and due modifications are made. Both relationships show good correlation with the test results; and the prediction of crack width of concrete beams reinforced with these two types of fiber reinforced plastic rebars is now possible. Key words: beam, cracking behaviour, cracking moment, crack width, fiber reinforced plastic, flexure, rebars, reinforced concrete, reinforcement ratio.

Analysis on Flexural Capacity of FRP Reinforced Concrete Members

2012 ◽  
Vol 446-449 ◽  
pp. 98-101
Author(s):  
Chun Xia Li ◽  
Zhi Sheng Ding ◽  
Shi Lin Yan
Keyword(s):  
Reinforced Concrete ◽  
Material Properties ◽  
Failure Modes ◽  
Reinforcement Ratio ◽  
Flexural Capacity ◽  
Steel Reinforced Concrete ◽  
Concrete Members

The balanced reinforcement ratio of FRP-reinforced concrete members and the flexural capacity under two different failure modes (concrete crushing and FRP rupture) are established, based on the analysis on flexural capacity of steel-reinforced concrete members in current concrete code. The effect of material properties on the balanced ratio, the variation of flexural capacity with different reinforcement ratio and a simplified nominal flexural capacity under FRP-rupture failure are derived.

scholarly journals Uniaxial Cyclic Tests on Reinforced Concrete Members with Lap Splices

2019 ◽  
Vol 35 (2) ◽  
pp. 1023-1043 ◽  
Author(s):  
Danilo Tarquini ◽  
João P. Almeida ◽  
Katrin Beyer
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Local Deformation ◽  
Experimental Program ◽  
Loading History ◽  
Cyclic Tests ◽  
Continuous Reinforcement ◽  
Lap Splices ◽  
Lap Splice ◽  
Concrete Members

This data paper presents the quasi-static uniaxial cyclic tests of 24 reinforced concrete members, of which 22 feature lap splices and 2 are reference units with continuous reinforcement. The objective of the experimental program is to investigate the influence of lap splice length ( ls), confining reinforcement, and loading history on the behavior of lap splices. Particular attention is placed on the measurement of local deformation quantities, such as lap splice strains and rebar-concrete slip. Details of the geometry and reinforcement layout of the specimens as well as the employed test setup, instrumentation, and loading protocols are provided. The global behavior of the test units, including the observed crack pattern and failure modes, are discussed. The organization of the experimental data, which are made available for public use under DOI: 10.5281/zenodo.1205887, is outlined in detail.

On the nonlinear behaviour of reinforced concrete frames

1990 ◽  
Vol 17 (5) ◽  
pp. 698-704 ◽  
Author(s):  
F. J. Vecchio ◽  
S. Balopoulou
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Load Capacity ◽  
Concrete Strength ◽  
Theoretical Modelling ◽  
Nonlinear Behaviour ◽  
Concrete Frames ◽  
Membrane Action ◽  
Ultimate Load Capacity ◽  
Plane Frame

An experimental investigation is described in which a large-scale reinforced concrete plane frame is tested to study factors contributing to its nonlinear behaviour under short-term loading conditions. The test results indicate that frame behaviour can be significantly affected by second-order influences such as material nonlinearities, geometric nonlinearities, concrete shrinkage, tension stiffening effects, shear deformations, and membrane action. A nonlinear frame analysis procedure, previously developed taking these mechanisms into account, is shown to accurately predict most aspects of behaviour, including deflection response, ultimate load capacity, and failure mechansim. Aspects of the theoretical modelling which are in need of further improvement are also identified. Key words: analysis, behaviour, deformation, frame, large scale, nonlinear, reinforced concrete, strength, test.

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