How to avoid local brick failure in this connection?

Question

Posted by Omar ElNaggaralmost 4 years ago

i need a solution for local brick failure mode, knowing that using brick of higher strength will enhance but not that much that the connection still unsafe

AAC,masonry Anchoring,brick local failure,light weight concrete

01-AAC-Middle east.pdf648.53 KB

1 Reply

Posted by Tony Yangalmost 4 years ago

Hi Omar,

Thank you for your question and apologies for the delayed response.

For ETA approved masonry units, the resistance and parameters are only valid for that particular brick or for bricks of the same material with larger size and larger compressive strength according to ETAG 029.

In complying with the guidelines of ETAG 029, the characteristic resistance of one anchor in case of local brick failure are given in the relevant approval documents and these are based on testing for a particular brick. Finding a solution to improve this shear design resistance will need further analysis of the brick type and corresponding testing in relation to spacing and edge distances. Unfortunately, these are pre-determined values for specific brick types, and available in our ETA for masonry approved chemical anchors. For example, HY270 (ETA link - HY270 LINK ) has a characteristic resistance of V_RK,b = 6 or 9 KN depending on the Brick strength (12 or 28 N/mm2), highlighted below for anchoring into Solid Calcium Silicate Brick KS, 2DF.

Similarly other failure modes can be calculated or pre-determined values obtained from ETA

kind regards
Ask Hilti Team
Australia

masonry,HY270