Horizon Information Portal

MSOE Library Home

MSOE Library Home

Home

Analysis of combined shear and tensile loading on all-bolted, single-angle shear connections / by Christopher Chicon.

by Cichon, Christopher

Steel, Structural -- Specifications

Joints (Engineering)

Shear (Mechanics)

Structural analysis (Engineering)

107 leaves : ill. ; 29 cm.

Thesis advisor: Christopher Raebel

Committee members: Dr. Hans-Peter Huttelmaier, Michael Kempfert

Introduction, history, and literature review -- Experimental methodology -- Results -- Conclusion -- References -- A. Shop drawings -- B. Tension test graphs -- C. Sheap capacity calculations.

In response to several recent building collapses following incidents of localized damage that developed into progressive collapse, the 2009 International Building Code has been revised to include a section regarding structural integrity. This section mandates, amongst other things, that beam to column connections must not only support the vertical reaction forces from the beam, but also a specified axial tension force. Simple shear connections, most notable the all-bolted, single-angle connection, are only designed to resist the end reaction of a beam, and their behavior when under axial tension forces have only been briefly investigated.

This project investigates how the single-angle connection behaves when subjected to only an axial tension load and to simultaneous vertical shear and tension loads through a series of experiments conducted on full-scale connections. Two styles of the single-angle connections are tested; six specimens use a three-bolt configuration and three specimens use a five-bolt configuration. Testing is performed in the MSOE-CSEC test frame with the angles acting as a connection between a tension force applying actuator and the test frame. Some tests include a shear force applied by a second actuator oriented perpendicular to the tension applying actuator. This shear load is held constant through the duration of the test and is equal to 25% of the connection's shear capacity. Overall, four of the three-bolt connections and two of the five-bolt are tested in the tension only condition. Two of the three-bolt connections and all five-bolt connections are tested with a washer between the bolt head and the inside face of the outstanding angle leg. The remaining two specimens from the three-bolt connection category are tested without the washer present. Removing the washer isolates the angle section and allows for further investigation of the angle's behavior. The two remaining three-bolt angles and the one remaining five-bolt angle are tested under a simultaneous tension and shear condition.

Three main conclusions were reached. First, all of the tested connections met and exceeded the capacity requirements for end connections in steel structures as defined in Section 1614 of the 2009 International Building Code. Second, the simultaneous application of the axial tensile load and a constant vertical shear load did not influence the ultimate tensile strength of the connection. Third, failure of the connections was due to one of two limit states, one of them being the tension failure of the bolts connecting the angle to the test frame. The other limit state was the rupture of the outstanding angle leg on the bolt line, which resulted in the loss of stiffness of the connection and the eventual ruptures of the entire net section.

Horizon Information Portal 3.25_9885

Powered by SirsiDynix

© 2001-2013 SirsiDynix All rights reserved.

Horizon Information Portal