scholarly journals Investigation of crack prediction in reinforced concrete liquid containing structures

2021 ◽  
Author(s):  
Armin Zyarishalmani
Keyword(s):  
Reinforced Concrete ◽  
Prediction Models ◽  
Theoretical Calculations ◽  
Experimental Tests ◽  
Fiber Reinforced Polymers ◽  
Water Leakage ◽  
Positive Role ◽  
Reinforced Polymers ◽  
Cracking Behavior ◽  
Advantages And Disadvantages

Cracking in liquid containing structures, if it is not properly controlled, can have serious detrimental effects on the overall system functionality. Having a consistent knowledge of concrete cracking characteristics is essential for a designer to ensure serviceability requirements of the structure. In spite of several proposed crack prediction models that have been used as the base for design codes, still a lack of certainty can be clearly felt in predicting cracking behavior of reinforced concrete. This is due to the fact that cracking is a very complex phenomenon in which numerous factors are involved, and it is always too cumbersome to take the effects of all these influential aspects into account. In order to acquire more insight into this issue, a comprehensive attempt has been made both experimentally and theoretically here in this study. This research is primarily dealing with cracks that develop under monotonic increasing load which is the main cause for the formation of wide cracks among other causes such as shrinkage or temperature. In this regard, several laboratory tests were conducted on a one meter wide strip of a tank wall. These experiments covered a range of loading configuration that would enable various combinations of stresses across the reinforced concrete section. Cracking behavior and water tightness of the slab were closely monitored and reported. Fiber reinforced polymers were shown to be a suitable means of remediation in reducing water leakage or recovering structural strength. A positive role of concrete autogenous healing on water leakage was investigated during the practical test. A comparison is made between experimental results and several recent well-known crack prediction models, through which their advantages and disadvantages are revealed and discussed. Several finite element models (FEM) have been successfully built with the aid of computer program ABAQUS/6.5 to capture the post-failure stress/strain condition in concrete and reinforcement, the results of which are perfectly matching with those obtained from experimental tests and theoretical calculations.

scholarly journals Investigation of crack prediction in reinforced concrete liquid containing structures

2021 ◽  
Author(s):  
Armin Zyarishalmani
Keyword(s):  
Reinforced Concrete ◽  
Prediction Models ◽  
Theoretical Calculations ◽  
Experimental Tests ◽  
Fiber Reinforced Polymers ◽  
Water Leakage ◽  
Positive Role ◽  
Reinforced Polymers ◽  
Cracking Behavior ◽  
Advantages And Disadvantages

Cracking in liquid containing structures, if it is not properly controlled, can have serious detrimental effects on the overall system functionality. Having a consistent knowledge of concrete cracking characteristics is essential for a designer to ensure serviceability requirements of the structure. In spite of several proposed crack prediction models that have been used as the base for design codes, still a lack of certainty can be clearly felt in predicting cracking behavior of reinforced concrete. This is due to the fact that cracking is a very complex phenomenon in which numerous factors are involved, and it is always too cumbersome to take the effects of all these influential aspects into account. In order to acquire more insight into this issue, a comprehensive attempt has been made both experimentally and theoretically here in this study. This research is primarily dealing with cracks that develop under monotonic increasing load which is the main cause for the formation of wide cracks among other causes such as shrinkage or temperature. In this regard, several laboratory tests were conducted on a one meter wide strip of a tank wall. These experiments covered a range of loading configuration that would enable various combinations of stresses across the reinforced concrete section. Cracking behavior and water tightness of the slab were closely monitored and reported. Fiber reinforced polymers were shown to be a suitable means of remediation in reducing water leakage or recovering structural strength. A positive role of concrete autogenous healing on water leakage was investigated during the practical test. A comparison is made between experimental results and several recent well-known crack prediction models, through which their advantages and disadvantages are revealed and discussed. Several finite element models (FEM) have been successfully built with the aid of computer program ABAQUS/6.5 to capture the post-failure stress/strain condition in concrete and reinforcement, the results of which are perfectly matching with those obtained from experimental tests and theoretical calculations.

scholarly journals Behavior of Columns Confined With FRP Fabrics under Repeated Lateral Loads

2019 ◽  
pp. 1-19
Author(s):  
Hesham A. Haggag ◽  
Nagy F. Hanna ◽  
Ghada G. Ahmed
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Axial Load ◽  
Axial Loading ◽  
Concrete Columns ◽  
Fiber Reinforced Polymers ◽  
Lateral Loads ◽  
Reinforced Concrete Columns ◽  
Reinforced Polymers ◽  
Axial Capacity

The axial strength of reinforced concrete columns is enhanced by wrapping them with Fiber Reinforced Polymers, FRP, fabrics.  The efficiency of such enhancement is investigated for columns when they are subjected to repeated lateral loads accompanied with their axial loading.  The current research presents that investigation for Glass and Carbon Fiber Reinforced Polymers (GFRP and CFRP) strengthening as well.  The reduction of axial loading capacity due to repeated loads is evaluated. The number of applied FRP plies with different types (GFRP or CFRP) are considered as parameters in our study. The study is evaluated experimentally and numerically.  The numerical investigation is done using ANSYS software. The experimental testing are done on five half scale reinforced concrete columns.  The loads are applied into three stages. Axial load are applied on specimen in stage 1 with a value of 30% of the ultimate column capacity. In stage 2, the lateral loads are applied in repeated manner in the existence of the vertical loads.  In the last stage the axial load is continued till the failure of the columns. The final axial capacities after applying the lateral action, mode of failure, crack patterns and lateral displacements are recorded.   Analytical comparisons for the analyzed specimens with the experimental findings are done.  It is found that the repeated lateral loads decrease the axial capacity of the columns with a ratio of about (38%-50%).  The carbon fiber achieved less reduction in the column axial capacity than the glass fiber.  The column confinement increases the ductility of the columns under the lateral loads.

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