R. G. Drysdale1,  K. Hughes², J. Wierzbicki³, B. R. Banting⁴, and W. W. El-Dakhakhni

1. Professor Emeritus, Centre for Effective Design of Structures, Department of Civil Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada, drysdale@mcmaster.ca
2. A.Sc. Candidate Department of Civil Engineering, McMaster University, hughekj@mcmaster.ca
3. A.Sc. Candidate Department of Civil Engineering, McMaster University, wierzbj@mcmaster.ca
4. A.Sc. Candidate Department of Civil Engineering, McMaster University, bantinbr@mcmaster.ca
5. Martini Mascarin and George Chair in Masonry Design, Centre for Effective Design of Structures, Department of Civil Engineering, McMaster University, eldak@mcmaster.ca

ABSTRACT

This paper reports on full scale laboratory tests of concrete block walls reinforced with surface mounted ties to create a tied arch structural system. The intent is to use this system in basement wall construction so that hollow 20cm concrete block can be used in a cost-effective manner. Ten tests were performed on 3m high walls to investigate use of various reinforcing tie cross sections and various methods of anchoring the ties at the top and bottom of the wall to develop the tie strength. Although choice of an economical tie design was found to be important, it was readily apparent that development of simple anchoring systems would have the greatest impact on both cost and marketing success. Forty-six tests of various methods of anchoring the ties were carried out. The results of the wall and anchorage tests provide proof of the structural concept and form the basis for seeking code approval for use of arching concrete block basement walls.

KEYWORDS: Arching, backfill, basements, bending, concrete block, reinforcing, soil pressure, tied arch, ties.

C7-4