- Title
- Wind and earthquake shear load in asymmetrical loadbearing masonry buildings
- Creator
- Sing-Sang, Pedro; Totoev, Yuri; Page, Adrian W.
- Relation
- The Masonry Society Journal Vol. 27, Issue 1, p. 71-90
- Relation
- http://www.masonrysociety.org/html/resources/journal/TMSJournalBackIssues.htm
- Publisher
- The Masonry Society
- Resource Type
- journal article
- Date
- 2009
- Description
- Loadbearing masonry construction is a building system composed of masonry walls and concrete slabs, with the masonry walls supporting the slabs and acting as the main structural element resisting the lateral loads from wind and earthquake. In Australian practice, these buildings usually incorporate slip joints, which are placed between the unreinforced masonry walls and concrete slabs, to allow for long term differential movements between the walls and the slabs. In some areas they also serve as a membrane type damp-proof-course. Loadbearing masonry buildings are often composed of reinforced concrete slabs and supporting masonry walls arranged in a cellular pattern. In Australia, these buildings usually incorporate slip joints in the interfaces between walls and slabs, to allow for long term relative displacements caused by brick growth, concrete shrinkage, and thermal expansion and contraction. A common application of this technique is for ''walk up" apartment buildings up to five storeys [Page (2002)]. In this system of building, wind and earthquake actions are resisted by the floor slab acting as horizontal diaphragm in conjunction with the loadbearing walls. The load path therefore includes the slip joints at the wall-floor interface. The distribution of those actions among the walls of that building initially depends on the elastic stiffness and arrangement of the walls. However, once either softening of masonry or slip in the joints occurs, a redistribution of shear loads will result. The redistribution of shear is a complex process and is influenced by many factors, such as the nonlinear behaviour of masonry and slip joints, the compressive stress level in the walls, and the walls arrangement [Sing-Sang et al. (2006)].In asymmetrical buildings, the centre of mass does not coincide with the centre of wall stiffness. Hence, the lateral loading action tends to twist the building, and causes an increase of shear in the walls located at one side of the centre of stiffness, and a reduction of shear in the other walls. The building twisting also induces shear loading in the walls perpendicular to the lateral load direction. This behaviour may accelerate or delay the masonry softening and the slip in the joints. When either softening of masonry or slip in the joints occurs, the centre of wall stiffness will also change its position. Thus, during the loading process the effects of building torsion may change the shear distribution making the prediction of wall forces a very complex process.
- Subject
- slip joint; asymmetrical buildings; masonry; earthquakes; wind
- Identifier
- http://hdl.handle.net/1959.13/916875
- Identifier
- uon:8139
- Identifier
- ISSN:0741-1294
- Language
- eng
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