Shear Lag Effects in Angles Welded at Both Legs

Abedin, Mohammad; Maleki, Shervin; Kiani, Nafiseh; Shahrokhinasab, Esmail

doi:10.1155/2019/8041767

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…Moreover, since configuration of the suggested connection in this study is similar to double angle sections connected at both legs (Figure 13), the results of this study were compared to the shear lag coefficient of double angle connections studied by Abedin et al [7]. Table 5 shows the comparison of shear lag coefficients for two similar RHS and double angle connections with same leg sizes and connection lengths.…”

Section: Figure 11 the Proposed Equation For The Rhs Connections Conmentioning

confidence: 85%

“…The experimental results revealed that thickness of cap plates has a negligible effect on the ultimate joint capacity. Abedin et al [7,8] studied tension behaviour of single and double angle connections. The results of the numerical analyses showed that, in single angle connections, the effects of connection length, connection eccentricity, and gusset plate thickness are more pronounced, while in double-angle connections the last parameter is not very critical.…”

Section: Introductionmentioning

confidence: 99%

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Net Section Fracture Assessment of Welded Rectangular Hollow Structural Sections

et al. 2020

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Rectangular Hollow Sections (RHS) because of their high resistance to tension, as well as compression, are commonly used as a bracing member with slotted gusset plate connections in steel structures. Since in this type of connection only part of the section contributes in transferring the tensile load to the gusset plate, shear lag failure may occur in the connection. The AISC specification decreases the effective section net area by a factor to consider the effect of shear lag for a limited connection configuration. This study investigates the effective parameters on the shear lag phenomenon for rectangular hollow section members connected at corners using a single concentric gusset plate. The results of the numerical analysis show that the connection length and connection eccentricity are the only effective parameters in the shear lag, and the effect of gusset plate thickness is negligible because of the symmetric connection. The ultimate tensile capacity of the suggested connection in this study were compared to the typical RHS connection presented in the AISC and the similar double angle sections connected at both legs. The comparison indicates that tensile performance of the suggested connection in this study because of its lower connection eccentricity is much higher than the typical slotted connection and double angle connections. Therefore, a new equation is suggested based on the finite element analyses to modify the AISC equation for these connections.

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Section: Figure 11 the Proposed Equation For The Rhs Connections Conmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Net Section Fracture Assessment of Welded Rectangular Hollow Structural Sections

et al. 2020

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“…Limited studies have also been performed on the connection details of cross-frames [27] and the effect of lateral bracing and buckling of main girders after a fracture. Four types of cross-frame connection details, including the use of end-plate connection, connection plate and split-tee connection were experimentally investigated by Takahashi et al [28].…”

Section: Of 14mentioning

confidence: 99%

Effect of Cross-Frames on Load Distribution of Steel Bridges with Fractured Girder

Abedin

Mehrabi

2020

Infrastructures

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In steel girder bridges, fracture of one girder may occur without noticeable bridge profile changes. It is critical to ensure that the bridge will have adequate capacity to prevent collapse until the next cycle of inspection discovers the damage. It is realized that once one of the bridge girders is fractured, vertical loads need to be distributed through an alternative path to the intact girder(s). In this case, cross-frames can play an important role in transferring the loads and preventing from sudden collapse. This paper investigates the impact of cross-frames on load distribution after a fracture is occurred in one girder. Bridge configurations with different cross-frame spacing were studied using finite element modeling and simulation of the bridge behavior with a fractured steel plate girder. Nonlinear and dynamic solution methods were used for these analyses. Results of this investigation demonstrated the important role cross-frames can play in providing some reserved capacity for the bridge with fractured girder to enhance the bridge redundancy. The contribution of the cross-frames and the behavior of the bridge after fracture in one girder however depends on the configuration of the bridge. A study of the variation of the effect of cross-frames with respect to the number of girders is also included in this paper.

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“…If (37) be divided by positive term 1 n   , the link's flow will be obtained as it shown in the next term. (38) Since the link's flow can never be negative, the former term and consequently (28) will never hold. As a result, just when the following inequalities hold, DNDP's result in fix and variable demand conditions differs.…”

Section:  mentioning

confidence: 99%

Incorporating Variable Demand Assignment Into Discrete Network Design Problem

Rahimi¹

2020

Preprint

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The network design problem (NDP) is a bi-level problem with integer and decimal variables that aims to minimize the users' total cost under the budget constraints. Although utilizing variable demand models will theoretically change the NDP’s result, the demand was assumed to be fixed and known in the literature. In this paper, a mathematical analysis will be presented to justify the importance of using variable demand in the discrete network design problem (DNDP). The DNDP for Sioux-falls network will be solved in both variable and fixed demand conditions by using total enumeration (in the upper-level) and Frank-Wolf (in the lower-level) method. The result shows that DNDP findings for variable and fix demand conditions have significant differences, especially in the mid-budget level.

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Shear Lag Effects in Angles Welded at Both Legs

Cited by 9 publications

References 18 publications

Net Section Fracture Assessment of Welded Rectangular Hollow Structural Sections

Net Section Fracture Assessment of Welded Rectangular Hollow Structural Sections

Effect of Cross-Frames on Load Distribution of Steel Bridges with Fractured Girder

Incorporating Variable Demand Assignment Into Discrete Network Design Problem

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