Behavior of bolted top-seat angle connections in fire

Daryan, Amir Saedi; Yahyai, Mahmood

doi:10.1016/j.jcsr.2008.07.021

Cited by 38 publications

(14 citation statements)

References 7 publications

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“…In order to confirm and evaluate the accuracy of the spring-stiffness model under the fire conditions, four samples of the angle connection with bolts are used by experimental report, presented by Saedi Daryan et al [6][7][8][9][10][11][12][13][14] u b f (56)…”

Section: Accuracy Calibration Of the Proposed Modelmentioning

confidence: 99%

The Simple Model for Bolted Connections in Fire

Yahyai¹,

Behzadpoori²,

Daryan³

et al. 2011

ENG

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Recent structural collapses caused by fire have focused attention on research concerning fire safety in building design. Steel connections are an important component of any structural steel building as they provide links between the principal structural members. Considering the importance of this matter this paper describes a spring-stiffness model developed to predict the behavior of bolted angle connections bare-steel joints at elevated temperature. The joint components are considered as springs with predefined mechanical properties i.e. stiffness and strength. The elevated temperature joint's response can be predicted by assembling the stiffness of the components which are assumed to degrade with increasing temperature based on the recommendations presented in the design parameters code. Comparison of the results from the model with existing experimental data showed good agreement. The proposed model can be easily modified to describe the elevated temperature behavior of other types of joint as well as joints under large rotations.

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Section: Accuracy Calibration Of the Proposed Modelmentioning

confidence: 99%

The Simple Model for Bolted Connections in Fire

Yahyai¹,

Behzadpoori²,

Daryan³

et al. 2011

ENG

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“…They have studied the failure modes and characteristics and presented moment‐rotation curves of each connection. In 2009, Saedi and Yahyaei reported their research on the behavior of bolted top‐seat angle connections with and without web angles in fire conditions both experimentally and numerically. Also, in another study by Saedi et al in 2009, the behavior of Khorjini connections in fire conditions was investigated.…”

Section: Introductionmentioning

confidence: 99%

The modified spring‐stiffness model for welded simple connection at elevated temperature

Daryan

2018

Fire and Materials

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Summary The outbreak of fire events in high‐rise buildings in recent years and the vulnerability of steel structure buildings, which leads to partial or complete failure of structures, clearly illustrate the need for designing such buildings against fire. The first step in fire design of structures is to have access to simplified equations for analyzing structural components against fire. Regarding this issue, to provide moment‐rotation relationships for designing welded seated angle connections, a modified spring stiffness model is presented in this article. In this method, the effective connection components are represented as springs with certain strength and stiffness properties that change as the temperature changes. Considering the special effect of welds on the behavior of these types of connections, separate springs for each section of the welds are considered and the effects of temperature on welds and base metal are taken into account. Comparing the results obtained from the proposed formulas with those of the tests, as well as the numerical analysis results, shows that the results in this method can be provided fast and accurately.

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“…In the case of other connection details, Saedi Daryan () and Saedi Daryan and Yahyai (a, b) modeled the bolted angle connections with and without web angles considering the effect of elevated temperatures and concentrated forces applied to the connections using ansys finite element software. In this research, stiffness and strength deterioration of steel and bolts as well as nonlinear behavior of materials were considered.…”

Section: Introductionmentioning

confidence: 99%

“…Comparison between the result of numerical models and experimental test results showed good agreement in elastic and plastic ranges. More discussion about Khorjini connections and their application and the fire effect on this connection type can be found in the study of Saedi Daryan and Yahyai (a).…”

Section: Introductionmentioning

confidence: 99%

The study of welded semi‐rigid connections in fire

Yahyai

Daryan

2011

Structural Design Tall Build

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SUMMARY Considering the deterioration of steel properties by temperature increase and the importance of the influence of connection behavior on the behavior of steel structures, we find that the exact understanding of the behavior of a specific steel connection in fire as well as the information about the effect of fire on the principal constitutive characteristics of the connection is necessary for safe design against fire. Thus, in this paper, the behavior of welded angle connections is studied at elevated temperatures using the abaqus finite element software. Steel members and connection components are considered to behave nonlinearly; the degradation of steel properties with increasing temperature is considered according to EC3, BS5950 recommendations. The results of finite element and experimental tests conducted on welded angle connections are compared, and the obtained failure modes and moment–rotation–temperature characteristics are in good agreement with those associated with the experimental tests. In the following, since the knowledge about moment–temperature–rotation behavior of a specific connection is needed for a fire‐resistant design, these properties are accurately determined, and finally, the effect of some parameters such as the moment applied on beam, change of column axial force and change of beam shear force on the stiffness of these connections at elevated temperatures is determined. Copyright © 2011 John Wiley & Sons, Ltd.

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Behavior of bolted top-seat angle connections in fire

Cited by 38 publications

References 7 publications

The Simple Model for Bolted Connections in Fire

The Simple Model for Bolted Connections in Fire

The modified spring‐stiffness model for welded simple connection at elevated temperature

The study of welded semi‐rigid connections in fire

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