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Research Article
Comparative Analysis of Seismic Performance of RC Buildings with Variation of Column Size and Orientation
Issue:
Volume 13, Issue 1, February 2025
Pages:
1-9
Received:
16 December 2024
Accepted:
26 December 2024
Published:
14 January 2025
DOI:
10.11648/j.ajce.20251301.11
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Abstract: Enhancement of the seismic performance of RC structures plays an essential role in a country like Bangladesh, which is among the world's most tectonically active regions. In this study, G+5 storey residential building is chosen, which is situated in Rangpur City. This structure is modified into four categories based on the column size and orientation like B1 for original building, B2 for all the column are of same dimension, B3 for orientation in X direction and B4 for orientation in Y direction. For simplification, linear time history analysis is considered in dynamic analysis for all the buildings where the ground motion is taken ‘El Centro earthquake’ from the PEER Ground Motion Database. The result is evaluated based on lateral displacement, storey drift and base shear. In terms of lateral displacement and storey drift, the building B3, showed the least value for the X component of both earthquake EQx and EQy. On the other hand, the same building B3 showed the largest value for the Y component, while building B2 showed the least. This can be because of the increased rigidity of all the columns for the highest dimension in building B2 in the Y direction. Also, the same response is observed in peak-to-peak displacement. But for the base shear, building B2 showed the highest value for all cases due to the increase in building weight by 2.64%. The research showed building B2 showing optimum seismic performance against earthquake force from any direction. Also increace in seismic weight for building B2 helps in earthquake resistivity.
Abstract: Enhancement of the seismic performance of RC structures plays an essential role in a country like Bangladesh, which is among the world's most tectonically active regions. In this study, G+5 storey residential building is chosen, which is situated in Rangpur City. This structure is modified into four categories based on the column size and orientati...
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Review Article
Non-Destructive Testing Techniques for Condition Assessment of Concrete Structures: A Review
Belay Bayu Tefera*
,
Abrham Gebre Tarekegn
Issue:
Volume 13, Issue 1, February 2025
Pages:
10-31
Received:
26 November 2024
Accepted:
12 December 2024
Published:
23 January 2025
Abstract: Non-destructive testing (NDT) techniques have developed as important instruments in the evaluation of concrete structures, providing a way to analyze structural integrity and material qualities without causing damage. In analyzing the uniformity, homogeneity, approximate compressive strength, durability, the level of rebar corrosion in concrete, and other properties of damaged buildings, NDT technologies have a significant benefit. This paper offers a thorough examination of several NDT methods, emphasizing their usefulness in finding internal flaws, locating embedded items, and measuring surface-hardness and in-situ stress. Each method's applicability, limitations, and measured parameters are thoroughly addressed. The criteria for selecting appropriate NDT methods are discussed, followed by a comparison of different approaches to facilitate decision-making. The interpretation of NDT results is discussed, highlighting the significance of precise data processing and the relevance of sophisticated technology. Case studies were also provided to demonstrate the actual implementation and efficacy of NDT techniques in real-world circumstances. The assessment also suggests investing in advanced data visualization tools to better the interpretation and sharing of NDT results, as well as combining NDT data with Building Information Modeling systems to provide a more complete picture of structural problems. Finally, the paper indicates that NDT techniques are critical for assuring the safety, durability, and preservation of concrete structures, thereby significantly contributing to the upkeep of our built environment.
Abstract: Non-destructive testing (NDT) techniques have developed as important instruments in the evaluation of concrete structures, providing a way to analyze structural integrity and material qualities without causing damage. In analyzing the uniformity, homogeneity, approximate compressive strength, durability, the level of rebar corrosion in concrete, an...
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Research Article
Concrete Shear Walls with GFRP Bars: Simulation and Economic Design
Issue:
Volume 13, Issue 1, February 2025
Pages:
32-44
Received:
9 January 2025
Accepted:
24 January 2025
Published:
17 February 2025
Abstract: Premature corrosion of reinforcing steel is a significant concern for steel-reinforced concrete (RC) structures, often leading to deterioration before reaching their design life. To address this issue, glass fibre-reinforced polymer (GFRP) bars have proven effective as a corrosion-resistant alternative in structural elements such as beams, columns, and slabs. Recent studies have shown that concrete shear walls reinforced with GFRP bars exhibit acceptable performance in terms of ultimate strength. However, compared to conventional steel reinforcement, limited data exist regarding their cracking, deformation, creep susceptibility, long-term performance, and cost. In this paper, a parametric study using a finite-element analysis model, validated against experimental data, was conducted to evaluate the effect of common design variables in GFRP-reinforced concrete shear walls. The study identified optimal design solutions where GFRP-reinforced walls outperform conventional RC walls. The analysis revealed that optimal GFRP designs cost approximately 1.5 times more than steel-reinforced walls, with deflection and crack width emerging as critical factors influencing design feasibility. The use of high-strength concrete was found to have minimal impact on the feasible design region, while bond strength between GFRP bars and concrete significantly influenced crack width and overall performance. Furthermore, creep rupture was determined not to be a critical concern under typical loading conditions. The results highlight that feasible GFRP designs are governed by service conditions, whereas ultimate strength remains the primary constraint for steel-reinforced walls.
Abstract: Premature corrosion of reinforcing steel is a significant concern for steel-reinforced concrete (RC) structures, often leading to deterioration before reaching their design life. To address this issue, glass fibre-reinforced polymer (GFRP) bars have proven effective as a corrosion-resistant alternative in structural elements such as beams, columns,...
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Research Article
Study of the Behaviour of 3-Hinged Stiffening Girders Under Equivalent UDL and Point Loads Using SAP Analysis
Issue:
Volume 13, Issue 1, February 2025
Pages:
45-60
Received:
28 January 2025
Accepted:
18 February 2025
Published:
27 February 2025
Abstract: A 3-hinged stiffening girder is a structural element used in suspension bridges to provide additional stability and stiffness. It consists of a girder supported by three hinges typically at the two ends and at the centre allowing it to accommodate temperature variations, deflections, and dynamic loads while distributing stresses efficiently across the structure. This research aims to conduct a comprehensive comparative analysis of the equivalent uniform distributed load (UDL) transmitted through a 3-hinged stiffening girder cable with varying numbers of suspenders. The study has delved into the theories and definitions associated with the behaviors of suspended cables, exploring how different configurations of suspenders impact the distribution of loads and the overall structural performance of the system. The significance lies in achieving an optimal balance between load-bearing capacity, stability, and material efficiency. An insufficient number of suspenders may lead to uneven load distribution, potentially causing localized stress concentrations or overloading certain elements. On the other hand, an excessive number of suspenders may result in unnecessary complexity and increased construction costs without proportional benefits in load distribution. Understanding the influence of the number of suspenders on structural behaviors is essential for designing cost-effective and resilient suspended cable systems.
Abstract: A 3-hinged stiffening girder is a structural element used in suspension bridges to provide additional stability and stiffness. It consists of a girder supported by three hinges typically at the two ends and at the centre allowing it to accommodate temperature variations, deflections, and dynamic loads while distributing stresses efficiently across ...
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