PERFORMANCE OF ADHESIVE WALL-TO-DIAPHRAGM CONNECTIONS IN THE CANTERBURY EARTHQUAKES AND THE SUBSEQUENT EXPERIMENTAL PULL-OUT TEST PROGRAM

12th Canadian Masonry Symposium, Vancouver

REFERENCE

Dizhur D., Schultz, A., Ingham J. (2013). Performance of adhesive wall-to-diaphragm connections in the Canterbury Earthquakes and the subsequent experimental pull-out test program. In the proceedings of the 13th Canadian Masonry Symposium, Vancouver, Canada

Scope and methodology

• In-field test to evaluate the performance of wall-to-diaphraghm adhesive anchors

• 400 adhesive anchors tested (pull-out)

• The influence of the following variables was studied: adhesive type, strength of the substrate, embedment depth, anchor diameter, overburden level, anchor rod type, quality of installation and use of metal foil sleeve.

• The comparative performance of anchors installed at an angle of minimum 22.5 degrees and anchors positioned horizontally was investigated.

FINDINGS

• The ideal breakout of masonry in a roughly conical masonry failure surface was not observed.

• Adhesive anchors oriented horizontally were found to have a higher pull-out capacity and stiffness compared to the bent (22.5 degrees) anchor equivalent;

• Cementitious grout is a suitable anchor adhesive and a detailed installation procedure needs to be developed.

• Increasing the increasing embedment depth, the pull-out-capacity increases and the average bond stress at failure decreases.

• 16 mm anchor rod diameter was identified as the optimal anchor rod size for adhesive applications.

• Installing adhesive anchors as per the manufacturer’s instructions is critical to achieving an adequate pull-out capacity.