International Journal of Emerging Trends in Engineering Research , 2024
This article is focused on determination of fixed-end reactions, displacements, internal forces a... more This article is focused on determination of fixed-end reactions, displacements, internal forces and internal moments for the spatial curved bi-fixed beam with varying curvature and varying cross-sectional area. The objective is to analyze spatially curved beam without involving analytical differentiation and integration of the governing equations. A finite displacement transfer method to analyze spatially curved beam is used to obtain numerically approximate analysis results and to eliminate analytical differentiation and integration, completely. The results of the analysis procedure are compared with the results of other methods found in the literature. For the specific case of the circular helical beam, the fixed end reactions' values have absolute maximum and minimum percentage differences of 1.23% and 0.06%, respectively. For the specific case of the elliptic-helical beam, the fixed end reactions' values have absolute maximum and minimum percentage differences of 1.13% and 0.0%, respectively. The finite difference method, along with the recursive scheme, gives reasonably accurate results without involving complex calculations.
International Journal of Civil, Mechanical and Energy Science
Among the various lateral load resisting systems of the tall structures, diagrid structural syste... more Among the various lateral load resisting systems of the tall structures, diagrid structural system is a unique structural system and found effective compared to other bracing systems, which is increasingly popular from the past decades. The diagrids are perimeter structural configurations characterized by a grid of diagonal members which are involved both in gravity and in lateral load resistance. The diagrid structure ensures the overall stiffness and strength of the building only engaging the diagonal members in a purely axial behaviour and fully braces the interior gravity columns for stability only at joints of diagrid. The intermediate floors, are not laterally restrained by the global behaviour of the diagrid system, means if diagonals are continuous throughout the module height, the floors would derive a certain degree of lateral stiffness only from the flexural stiffness of the diagrids. Although diagrid system is good enough to perform well in lateral load resisting compare to other simple frame and shear wall building, we can combined the diagrid structure with shear walls for optimum design. The present study aimed to understand the behaviour of the diagrid structural system with shear walls at core. For this study a regular square plan of 30m × 30m diagrid structure considering different storey module (i.e. 4, 6, 8 & 12) with and without core Shear Walls is modelled and analyzed. For minimum displacement and drift different plan shape of shear wall are taken and one of them with optimum results is used for further analysis. Then behaviour of diagrid structure with and without shear wall along the height is also studied considering 24, 36 and 48 storey. ETABS software is used for modelling and analysis. Parameters such as inter storey drift-ratio, storey displacement, base shear and reduction in lateral load on diagrid are taken into consideration.
The development of high strength concrete, higher grade steel, new construction techniques and ad... more The development of high strength concrete, higher grade steel, new construction techniques and advanced computational technique has resulted in the emergence of a new generation of tall structures that are flexible, low in damping, slender and light in weight. These types of flexible structures are very sensitive to dynamic wind loads and adversely affect the serviceability and occupant comfort. This paper presents the results of Computational Fluid Dynamics technique using Ansys CFX software on rectangular building models having the same plan area and height but different side ratios of 1.25, 1.5, 1.75, 2.00 and 2.25. The wind pressure coefficients on all the models were evaluated from pressure records obtained from software under boundary layer flow for normal wind directions. It is observed that the side ratio of buildings significantly affects the wind pressures on leeward and sidewalls, whereas wind pressure on windward wall is almost independent of side ratio.
International Journal of Advanced Structural Engineering, 2010
This paper presents an Auto Redundant Technique for analysis of grid with curved members. This te... more This paper presents an Auto Redundant Technique for analysis of grid with curved members. This technique is based on the force method, but in the technique choice of the redundant is completely eliminated. The analysis technique is found very effective, accurate and programmable. A comprehensive C++ program has been developed to compute internal forces at the end of each member of the grid for different load cases and their combinations. Presently in this paper analysis of grid is carried out with fixed support when it is subjected to concentrated point load, twisting moment, bending moment, full/partial uniformly distributed load and full/partial uniformly varying load. In this technique, any number of load cases can be accommodated without creating any additional node(s) on the member. The power of the analysis procedure is effectively demonstrated through the solution of one benchmark problem. The results obtained through the program for complementary load cases are compared with...
Diagrids have emerged as an architectural choice i n the creation of tall buildings. Diagrids are... more Diagrids have emerged as an architectural choice i n the creation of tall buildings. Diagrids are able to adapt to a wi de range of non-rectilinear geometric forms, including irregular curves and angles. No other type of framed structure is capable of this task. Uniform angle diagrid structures are employed for some notable tall buildings such as Hearst Headquarters T o we rs in New York and diagrids with angle variations along the height is employed by Lotte S uper Tower Project in S eoul. This paper presents another way of varying angle for diagrid, angle variation along the width, which has not been employed in any real tall building. A regular floor plan of 40 m x 40 m is considered for 36,48 and 60 storey diagrid structures with different angle variation along the width is considered. ETABS software is used for modelling and analysis of structural members. Comparison in terms of displacement, time peri od a n d steel mass is presented for different varying angle diagrid along width.
International Journal of Emerging Trends in Engineering Research , 2024
This article is focused on determination of fixed-end reactions, displacements, internal forces a... more This article is focused on determination of fixed-end reactions, displacements, internal forces and internal moments for the spatial curved bi-fixed beam with varying curvature and varying cross-sectional area. The objective is to analyze spatially curved beam without involving analytical differentiation and integration of the governing equations. A finite displacement transfer method to analyze spatially curved beam is used to obtain numerically approximate analysis results and to eliminate analytical differentiation and integration, completely. The results of the analysis procedure are compared with the results of other methods found in the literature. For the specific case of the circular helical beam, the fixed end reactions' values have absolute maximum and minimum percentage differences of 1.23% and 0.06%, respectively. For the specific case of the elliptic-helical beam, the fixed end reactions' values have absolute maximum and minimum percentage differences of 1.13% and 0.0%, respectively. The finite difference method, along with the recursive scheme, gives reasonably accurate results without involving complex calculations.
International Journal of Civil, Mechanical and Energy Science
Among the various lateral load resisting systems of the tall structures, diagrid structural syste... more Among the various lateral load resisting systems of the tall structures, diagrid structural system is a unique structural system and found effective compared to other bracing systems, which is increasingly popular from the past decades. The diagrids are perimeter structural configurations characterized by a grid of diagonal members which are involved both in gravity and in lateral load resistance. The diagrid structure ensures the overall stiffness and strength of the building only engaging the diagonal members in a purely axial behaviour and fully braces the interior gravity columns for stability only at joints of diagrid. The intermediate floors, are not laterally restrained by the global behaviour of the diagrid system, means if diagonals are continuous throughout the module height, the floors would derive a certain degree of lateral stiffness only from the flexural stiffness of the diagrids. Although diagrid system is good enough to perform well in lateral load resisting compare to other simple frame and shear wall building, we can combined the diagrid structure with shear walls for optimum design. The present study aimed to understand the behaviour of the diagrid structural system with shear walls at core. For this study a regular square plan of 30m × 30m diagrid structure considering different storey module (i.e. 4, 6, 8 & 12) with and without core Shear Walls is modelled and analyzed. For minimum displacement and drift different plan shape of shear wall are taken and one of them with optimum results is used for further analysis. Then behaviour of diagrid structure with and without shear wall along the height is also studied considering 24, 36 and 48 storey. ETABS software is used for modelling and analysis. Parameters such as inter storey drift-ratio, storey displacement, base shear and reduction in lateral load on diagrid are taken into consideration.
The development of high strength concrete, higher grade steel, new construction techniques and ad... more The development of high strength concrete, higher grade steel, new construction techniques and advanced computational technique has resulted in the emergence of a new generation of tall structures that are flexible, low in damping, slender and light in weight. These types of flexible structures are very sensitive to dynamic wind loads and adversely affect the serviceability and occupant comfort. This paper presents the results of Computational Fluid Dynamics technique using Ansys CFX software on rectangular building models having the same plan area and height but different side ratios of 1.25, 1.5, 1.75, 2.00 and 2.25. The wind pressure coefficients on all the models were evaluated from pressure records obtained from software under boundary layer flow for normal wind directions. It is observed that the side ratio of buildings significantly affects the wind pressures on leeward and sidewalls, whereas wind pressure on windward wall is almost independent of side ratio.
International Journal of Advanced Structural Engineering, 2010
This paper presents an Auto Redundant Technique for analysis of grid with curved members. This te... more This paper presents an Auto Redundant Technique for analysis of grid with curved members. This technique is based on the force method, but in the technique choice of the redundant is completely eliminated. The analysis technique is found very effective, accurate and programmable. A comprehensive C++ program has been developed to compute internal forces at the end of each member of the grid for different load cases and their combinations. Presently in this paper analysis of grid is carried out with fixed support when it is subjected to concentrated point load, twisting moment, bending moment, full/partial uniformly distributed load and full/partial uniformly varying load. In this technique, any number of load cases can be accommodated without creating any additional node(s) on the member. The power of the analysis procedure is effectively demonstrated through the solution of one benchmark problem. The results obtained through the program for complementary load cases are compared with...
Diagrids have emerged as an architectural choice i n the creation of tall buildings. Diagrids are... more Diagrids have emerged as an architectural choice i n the creation of tall buildings. Diagrids are able to adapt to a wi de range of non-rectilinear geometric forms, including irregular curves and angles. No other type of framed structure is capable of this task. Uniform angle diagrid structures are employed for some notable tall buildings such as Hearst Headquarters T o we rs in New York and diagrids with angle variations along the height is employed by Lotte S uper Tower Project in S eoul. This paper presents another way of varying angle for diagrid, angle variation along the width, which has not been employed in any real tall building. A regular floor plan of 40 m x 40 m is considered for 36,48 and 60 storey diagrid structures with different angle variation along the width is considered. ETABS software is used for modelling and analysis of structural members. Comparison in terms of displacement, time peri od a n d steel mass is presented for different varying angle diagrid along width.
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Papers by Ashwin G. Hansora