When fillet weld loaded in the out-of-plane eccentricity there will be contact between the plates... more When fillet weld loaded in the out-of-plane eccentricity there will be contact between the plates. The strength of fillet weld depends on weld yielding and bearing between the connected plates. But, the contact between plates is not considered in the present Indian standard code (IS 800, General construction in steel—code of practice. Bureau of Indian Standards, New Delhi, 2007), Euro code (EC 3, Eurocode 3: design of steel structures—part 1–8: design of joints. European Committee for Standardization, Brussels, 1993) and Australian Code (AS 4100, Steel structures. Standards Australia, Homebush, 1998). For this, a finite element analysis (FEA) of weld was made for a plate thickness and varying weld sizes with no gap between plates. The study was limited to elastic state of weld and a significant difference was observed in elastic state between codes and FEA for the bending stresses that are developed due to loading. The comparison was also carried out between stress distribution in weld for the case of gap between plates and no gap between plates. Analysis was carried out for different loading pattern i.e., combinations of moment, shear and axial force.
Abstract This paper aims to provide a detailed review of the web crippling investigations carried... more Abstract This paper aims to provide a detailed review of the web crippling investigations carried out for different types of cold-formed sections. This paper summarizes the theoretical research and provides a brief comparison of the prediction performance of the design specifications with available experimental and numerical studies. Web crippling investigations on built-up sections, single and multi-web sections, perforated sections are reviewed, demonstrating the requirement of additional experimental and theoretical research in these sections. The research on the development of generalized beam theory and finite strip method to investigate web crippling phenomena is summarized. The shortcomings of the current design specifications regarding the strength prediction and the limitations of web crippling investigations are discussed. After evaluation of the current state-of-the-art, certain future areas of research are highlighted in this paper.
2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT), 2016
In the design of steel portal frames, we assume that the connections behave as it is pinned or ri... more In the design of steel portal frames, we assume that the connections behave as it is pinned or rigid. Truly the connection would not behave as ideally pinned or ideally rigid. The connection falls between pinned and rigid, and it is known as semi-rigid. Change in the connection behavior changes the behavior of structure. Increase in the flexibility of connection leads to the secondary effects in the structures like drift. The proper behavior of structure can be known by incorporating the connection response in the structural analysis. The behavior of connection can be known by Moment Rotation response. In this paper Authors analyze and classify the Moment Rotation relations given in literature and developed a program to plot Moment Rotation curves.
Assembly free FEM bypasses the assembly step and solves the system of linear equations at the ele... more Assembly free FEM bypasses the assembly step and solves the system of linear equations at the element level using Conjugate Gradient (CG) type iterative solver. The smaller dense Matrix-vector Products (MvPs) are encapsulated within the CG solver and are computed either at element level or degree of freedom (DoF) level. Both these strategies exploit the computing power of GPU effectively, but the performance is lagging due to the uncoalesced global memory access on GPU. This paper proposes an improved MvP strategy in assembly free FEM, which improves the performance by coalesced global memory access using on-chip faster shared memory and using the texture cache memory on GPU. Since GPU has limited shared memory (in few KBs), the proposed technique suffers from a problem known as low occupancy. Despite the low occupancy issue, the proposed strategy outperforms both element based and DoF based MvP strategies on GPU. Numerical experiments compared with element level and DoF level strategies on GPU and found that, GPU instance of proposed MvP outperforms both strategies approximately by factor of 7 and 1.5 respectively.
Presently, communication technology has become significantly important. The need for tall towers ... more Presently, communication technology has become significantly important. The need for tall towers has been increasing with the requirements for effective communication, particularly for television, radio, GSM, and Internet traffic. Analysis and design of these dynamically sensitive towers are generally governed by the wind loads. Wind excitation induces fluctuating stresses in the members of the tower leading to fatigue damages of the members. In achieving safety with economy for construction, accurate determination of wind load is important. Design wind loads are calculated from the provisions given in the codes and standards. Communication towers subject to vibrations due to wind gusts, which are analyzed using the gust load factor method. This method gives an accurate estimation of wind response of the structure as it considers the resonant component of wind loads. In this paper, microwave lattice tower heights of 21, 30, and 50 m are considered and wind forces are determined usin...
In this paper, mathematical models available for eight commonly used beam-to-column connections l... more In this paper, mathematical models available for eight commonly used beam-to-column connections like single-web angle, double-web angle, top and seat angle with and without web angles, extended end-plate, flushed end-plate, and header plate connections are studied from literature. Connection analysis program is developed to obtain moment–rotation response of each type of connection using empirical data available models in the literature. Bjorhovde’s classification system is used for the classification of the connections. Each type of connection as listed are analyzed; moment–rotation response of each connection is obtained using available models in literature; and results are compared.
When fillet weld loaded in the out-of-plane eccentricity there will be contact between the plates... more When fillet weld loaded in the out-of-plane eccentricity there will be contact between the plates. The strength of fillet weld depends on weld yielding and bearing between the connected plates. But, the contact between plates is not considered in the present Indian standard code (IS 800, General construction in steel—code of practice. Bureau of Indian Standards, New Delhi, 2007), Euro code (EC 3, Eurocode 3: design of steel structures—part 1–8: design of joints. European Committee for Standardization, Brussels, 1993) and Australian Code (AS 4100, Steel structures. Standards Australia, Homebush, 1998). For this, a finite element analysis (FEA) of weld was made for a plate thickness and varying weld sizes with no gap between plates. The study was limited to elastic state of weld and a significant difference was observed in elastic state between codes and FEA for the bending stresses that are developed due to loading. The comparison was also carried out between stress distribution in weld for the case of gap between plates and no gap between plates. Analysis was carried out for different loading pattern i.e., combinations of moment, shear and axial force.
Abstract This paper aims to provide a detailed review of the web crippling investigations carried... more Abstract This paper aims to provide a detailed review of the web crippling investigations carried out for different types of cold-formed sections. This paper summarizes the theoretical research and provides a brief comparison of the prediction performance of the design specifications with available experimental and numerical studies. Web crippling investigations on built-up sections, single and multi-web sections, perforated sections are reviewed, demonstrating the requirement of additional experimental and theoretical research in these sections. The research on the development of generalized beam theory and finite strip method to investigate web crippling phenomena is summarized. The shortcomings of the current design specifications regarding the strength prediction and the limitations of web crippling investigations are discussed. After evaluation of the current state-of-the-art, certain future areas of research are highlighted in this paper.
2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT), 2016
In the design of steel portal frames, we assume that the connections behave as it is pinned or ri... more In the design of steel portal frames, we assume that the connections behave as it is pinned or rigid. Truly the connection would not behave as ideally pinned or ideally rigid. The connection falls between pinned and rigid, and it is known as semi-rigid. Change in the connection behavior changes the behavior of structure. Increase in the flexibility of connection leads to the secondary effects in the structures like drift. The proper behavior of structure can be known by incorporating the connection response in the structural analysis. The behavior of connection can be known by Moment Rotation response. In this paper Authors analyze and classify the Moment Rotation relations given in literature and developed a program to plot Moment Rotation curves.
Assembly free FEM bypasses the assembly step and solves the system of linear equations at the ele... more Assembly free FEM bypasses the assembly step and solves the system of linear equations at the element level using Conjugate Gradient (CG) type iterative solver. The smaller dense Matrix-vector Products (MvPs) are encapsulated within the CG solver and are computed either at element level or degree of freedom (DoF) level. Both these strategies exploit the computing power of GPU effectively, but the performance is lagging due to the uncoalesced global memory access on GPU. This paper proposes an improved MvP strategy in assembly free FEM, which improves the performance by coalesced global memory access using on-chip faster shared memory and using the texture cache memory on GPU. Since GPU has limited shared memory (in few KBs), the proposed technique suffers from a problem known as low occupancy. Despite the low occupancy issue, the proposed strategy outperforms both element based and DoF based MvP strategies on GPU. Numerical experiments compared with element level and DoF level strategies on GPU and found that, GPU instance of proposed MvP outperforms both strategies approximately by factor of 7 and 1.5 respectively.
Presently, communication technology has become significantly important. The need for tall towers ... more Presently, communication technology has become significantly important. The need for tall towers has been increasing with the requirements for effective communication, particularly for television, radio, GSM, and Internet traffic. Analysis and design of these dynamically sensitive towers are generally governed by the wind loads. Wind excitation induces fluctuating stresses in the members of the tower leading to fatigue damages of the members. In achieving safety with economy for construction, accurate determination of wind load is important. Design wind loads are calculated from the provisions given in the codes and standards. Communication towers subject to vibrations due to wind gusts, which are analyzed using the gust load factor method. This method gives an accurate estimation of wind response of the structure as it considers the resonant component of wind loads. In this paper, microwave lattice tower heights of 21, 30, and 50 m are considered and wind forces are determined usin...
In this paper, mathematical models available for eight commonly used beam-to-column connections l... more In this paper, mathematical models available for eight commonly used beam-to-column connections like single-web angle, double-web angle, top and seat angle with and without web angles, extended end-plate, flushed end-plate, and header plate connections are studied from literature. Connection analysis program is developed to obtain moment–rotation response of each type of connection using empirical data available models in the literature. Bjorhovde’s classification system is used for the classification of the connections. Each type of connection as listed are analyzed; moment–rotation response of each connection is obtained using available models in literature; and results are compared.
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Papers by Arvind Vyavahare