Fifth International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2017
Author(s) : RALMAR MARSH , TREVOR NEVILLE HAAS
Low income unreinforced masonry structures in the southwestern region of the Western Cape Province of S outh Africa present a safety and economic threat if subjected to moderate intensity seismic activity. Previous experience and investigations conducted have shown the vulnerability to damage and/or collapse when these structures are subjected to moderate se ismicity. Most unreinforced masonry buildings in South Africa were constructed prior to the first codified provision for seismicity contained in SABS 0160 of 1989. Numerous other residential unreinforced buildings were constructed since then. To date these types of structures have not been evaluated for South African conditions, and concerns have been expressed whether these structures conform to the new codified guidelines contained in SANS 10160 - 4 of 2011, which is almost a verbatim repetition of the Euro pean code for seismic design. Before an analysis of unreinforced masonry buildings can be conducted, it is imperative to determine the effect which opening have on unreinforced masonry walls. This was achieved by conducting experimental tests on four unrei nforced masonry walls with various size openings, to determine its effect on the in - plane stiffness, failure frequency and failure displacement. Experimental results show that there is a relationship between the opening sizes versus the wall stiffness, fai lure frequency and failure displacement.