Finite Element Analysis of Single Plate Shear Connections

Type of Document Dissertation
Author Ashakul, Aphinat
Author's Email Address aashakul@vt.edu
URN etd-06042004-141144
Title Finite Element Analysis of Single Plate Shear Connections
Degree PhD
Department Civil Engineering
Advisory Committee
Advisor Name Title
Thomas M. Murray Committee Chair
Finley A. Charney Committee Member
Mahendra P. Singh Committee Member
Raymond H. Plaut Committee Member
W. Samuel Easterling Committee Member
Keywords

* Simulation
* Weld
* Bolt
* Connection
* ABAQUS
* Finite Element
* Plate
* Shear

Date of Defense 2004-05-11
Availability unrestricted
Abstract

There have been several design models for single plate shear connections in the past 20 years. The current design model states that the bolt shear rupture strength of a connection is a function of the number of bolts and the a-distance, which is the distance from the weld line to the bolt line. The evaluation of this design model demonstrates inconsistent predictions for the strength of the connection.

The finite element program ABAQUS was used throughout the research to study single plate shear connections. Finite element analyses included model verification and investigations of parameters, including the effect of a-distance, plate thickness, plate material, and the position of a connection with respect to a beam neutral axis. In addition, double-column bolt connections were studied.

The results show that bolt shear rupture strength of a connection is not a function of the a-distance. Plate materials and thicknesses that do not satisfy ductility criteria result in connections with significant horizontal forces at the bolts. This horizontal force reduces the shear strength of a bolt group and creates a moment that must be considered in design. The magnitude of the force depends on the location of the bolt with respect to the beam neutral axis. A new design model for single plate shear connections with bolts in a single column is proposed.

It was found that in double-column bolt connections, force redistribution among the bolt columns occurs. Force redistribution does not occur when thick plates are used, resulting in bolts in the outer column (from the support) fracturing while bolts in the inner column resist much less force. Further study is needed for double-column configurations.

The study of plate behavior shows that the shear stress distribution when a plate reaches the strain hardening stage is not constant throughout the cross section. A relationship for calculating plate shear yielding strength based on this shear distribution is proposed.

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