MECHANICAL EVALUATION OF A NOVEL SEMI-RIGID STEEL CONNECTION

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LAVASANI H.H.; YOUNESI ERFAN

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Journal: Modares Civil Engineering journal Year:2016 | Volume:16 | Issue:5 (SUPPLEMENT) Page(s): 45-51

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Title

MECHANICAL EVALUATION OF A NOVEL SEMI-RIGID STEEL CONNECTION

Author(s)

LAVASANI H.H. | YOUNESI ERFAN | Issue Writer Certificate

Keywords

SEMI-RIGID CONNECTIONSQ2

FINITE ELEMENT METHODQ2

FLEXIBLE CONNECTINGQ2

BONDING STRENGTHQ2

DUCTILITY OF CONNECTIONQ2

Abstract

With regard to the increase of computing power in the past decade, FINITE ELEMENT METHODs have been used to obtain the graphs of rotational moment curves which reflect non-linear effect in connections response. Using FINITE ELEMENT METHODs, the effect of different parameters on connections behavior can be investigated. In this study, several common SEMI-RIGID CONNECTIONS are modeled and their behavioral properties are briefly reviewed. Providing the details related to a new semi-fixed connection, its behavioral properties including hardness, ultimate capacity and ductility are investigated and compared with other modeled connections.To perform non-linear analyses of connection, the finite element software of Abaqus is used in this study. The main concern in this modeling is to have inter-component interactions with the most consistency with real specifications. Bolted connections and the exact interaction between the bolt surface and the hole are modeled as a hard friction, with friction coefficient of 0.3 with the ability of separating after loading. Also, fillet welds are modeled as a prism with triangular section. Where a groove weld is applied, two connection parts are stuck together, because the strength in this type of welding is like base metal. To mesh the element, C3D8R element is used. The behavior of high strength bolts A10.9, is modeled with the poly-line elasto-plastic stress-strain curve. The force is applied to samples according to the loading protocol presented by ATC-SAC, which in fact expresses real earthquakes.The proposed connection n1 has the most rigidity values among studied SEMI-RIGID CONNECTIONS. Reducing the number of connection bolts decreases the connection rigidity value. With the half thickness for upper and lower plates, rigidity rate is reduced only 9%; Where half of the considered bolts are used, rigidity rate is reduced by 64%. Connection n3 has the lowest rigidity rate and its rigidity value is in the class of bolted connection in the seat angle to web angle.In high strength connections, the connection strength is highly related to girder strength, where the plastic joint is formed in girder. Connections with low strength will have the plastic joint in connection. Thus, they are not applicable in flexural resisting frames. Four modes of rigid connection with high strength, semi-rigid connection with high strength, rigid connection with low strength and semi-rigid connection with low strength can be used in flexural resisting structures.Connection ductility is a key parameter for SEMI-RIGID CONNECTIONS in which deformations are concentrated in connection members.Results show that the mechanisms discussed for the connections of this research have the ability of covering different classes of strength with the changes such as reducing the number of bolts or reducing the thickness of upper and lower plates. Also this connection has the ability to absorb energy.

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APA: Copy

LAVASANI, H.H., & YOUNESI, ERFAN. (2016). MECHANICAL EVALUATION OF A NOVEL SEMI-RIGID STEEL CONNECTION. MODARES CIVIL ENGINEERING JOURNAL, 16(5 (SUPPLEMENT)), 45-51. SID. https://sid.ir/paper/256700/en

Vancouver: Copy

LAVASANI H.H., YOUNESI ERFAN. MECHANICAL EVALUATION OF A NOVEL SEMI-RIGID STEEL CONNECTION. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(5 (SUPPLEMENT)):45-51. Available from: https://sid.ir/paper/256700/en

IEEE: Copy

H.H. LAVASANI, and ERFAN YOUNESI, “MECHANICAL EVALUATION OF A NOVEL SEMI-RIGID STEEL CONNECTION,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 5 (SUPPLEMENT), pp. 45–51, 2016, [Online]. Available: https://sid.ir/paper/256700/en

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