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Initial in-plane rotational stiffness of welded RHS T joints with axial force in main member

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Initial in-plane rotational stiffness of welded RHS T joints with axial force in main member. / Garifullin, Marsel; Pajunen, Sami; Mela, Kristo; Heinisuo, Markku; Havula, Jarmo.

In: Journal of Constructional Steel Research, Vol. 139, 01.12.2017, p. 353-362.

Research output: Contribution to journalArticleScientificpeer-review

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Garifullin, Marsel ; Pajunen, Sami ; Mela, Kristo ; Heinisuo, Markku ; Havula, Jarmo. / Initial in-plane rotational stiffness of welded RHS T joints with axial force in main member. In: Journal of Constructional Steel Research. 2017 ; Vol. 139. pp. 353-362.

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@article{73b1c363fa734fd9a98cdaf4edbab9aa,
title = "Initial in-plane rotational stiffness of welded RHS T joints with axial force in main member",
abstract = "In the frame analysis, the local analysis model of the joint must follow the behavior of the joint. When completing the elastic global analysis, the initial rotational stiffness of the joints should be known to obtain the reliable moment distribution between the members of the frame. This paper evaluates the existing calculation approach for the initial rotational stiffness of welded rectangular hollow section T joints. Validation with the experiments shows that the current calculation approach significantly underestimates their initial rotational stiffness. Based on the existing experimental data, the paper proposes the improvement for determining the initial stiffness. The second part of the article investigates the effect of the axial force in the main member on the initial rotational stiffness of the joint. The conducted numerical study on square hollow section T joints shows that the reduction of their initial stiffness can reach 50{\%}, when the main member experiences the normal stresses close to yielding. Using the curve fitting approach, the paper proposes and validates a corresponding chord stress function, similar to the existing ones for the moment resistance.",
keywords = "Chord stress function, In-plane moment load, Rotational stiffness, Welded tubular T joint",
author = "Marsel Garifullin and Sami Pajunen and Kristo Mela and Markku Heinisuo and Jarmo Havula",
year = "2017",
month = "12",
day = "1",
doi = "10.1016/j.jcsr.2017.09.033",
language = "English",
volume = "139",
pages = "353--362",
journal = "Journal of Constructional Steel Research",
issn = "0143-974X",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Initial in-plane rotational stiffness of welded RHS T joints with axial force in main member

AU - Garifullin, Marsel

AU - Pajunen, Sami

AU - Mela, Kristo

AU - Heinisuo, Markku

AU - Havula, Jarmo

PY - 2017/12/1

Y1 - 2017/12/1

N2 - In the frame analysis, the local analysis model of the joint must follow the behavior of the joint. When completing the elastic global analysis, the initial rotational stiffness of the joints should be known to obtain the reliable moment distribution between the members of the frame. This paper evaluates the existing calculation approach for the initial rotational stiffness of welded rectangular hollow section T joints. Validation with the experiments shows that the current calculation approach significantly underestimates their initial rotational stiffness. Based on the existing experimental data, the paper proposes the improvement for determining the initial stiffness. The second part of the article investigates the effect of the axial force in the main member on the initial rotational stiffness of the joint. The conducted numerical study on square hollow section T joints shows that the reduction of their initial stiffness can reach 50%, when the main member experiences the normal stresses close to yielding. Using the curve fitting approach, the paper proposes and validates a corresponding chord stress function, similar to the existing ones for the moment resistance.

AB - In the frame analysis, the local analysis model of the joint must follow the behavior of the joint. When completing the elastic global analysis, the initial rotational stiffness of the joints should be known to obtain the reliable moment distribution between the members of the frame. This paper evaluates the existing calculation approach for the initial rotational stiffness of welded rectangular hollow section T joints. Validation with the experiments shows that the current calculation approach significantly underestimates their initial rotational stiffness. Based on the existing experimental data, the paper proposes the improvement for determining the initial stiffness. The second part of the article investigates the effect of the axial force in the main member on the initial rotational stiffness of the joint. The conducted numerical study on square hollow section T joints shows that the reduction of their initial stiffness can reach 50%, when the main member experiences the normal stresses close to yielding. Using the curve fitting approach, the paper proposes and validates a corresponding chord stress function, similar to the existing ones for the moment resistance.

KW - Chord stress function

KW - In-plane moment load

KW - Rotational stiffness

KW - Welded tubular T joint

U2 - 10.1016/j.jcsr.2017.09.033

DO - 10.1016/j.jcsr.2017.09.033

M3 - Article

VL - 139

SP - 353

EP - 362

JO - Journal of Constructional Steel Research

JF - Journal of Constructional Steel Research

SN - 0143-974X

ER -