1887

oa Civil Engineer in South Africa - A proposed parametric design model for shear in reinforced concrete : technical paper

Volume 29, Issue 4
  • ISSN : 0009-7845

 

Abstract

An ultimate limit state design model is presented for use in unusual situations of shear evaluation or for general use in explaining aspects of shear behaviour. The model specifically considers elements unreinforced for shear and the transition to elements lightly reinforced for shear in a consistent manner up to levels where the truss analogy becomes fully applicable. The model augments CP110 and BS8110 and is based on a semi-rational assessment of the observed (in tests) or visualized (in design) ultimate diagonal shear crack at failure. The evaluation of an observed ultimate failure mode in this regard has many parallels with yield line theory for flexure, in which the observed collapse mechanisms for slabs are used to quantify the ultimate collapse load. It is envisaged that the model will be used in a manner similar to yield line theory, in that both are used to undertake ultimate limit state checks on unusual structural situations. The necessity of using these approaches is dependent on the judgement of the engineer.

'n Swigtoestand-ontwerpmodel word aangebied vir gebruik in ongewone gevalle van skuifevaluasie, of om aspekte van skuifgedrag in die algemeen te verduidelik. Die model dek met name elemente sonder skuifwapening en die egalige oorgang na elemente met ligte skuifwapening tot op vlakke waar die vakwerkanalogie ten volle toepaslik is. Die model is aanvullend tot CP110 en BS8110 en is gegrond op 'n semi-rasionele waardering van waargenome (in toetse) of voorgestelde (in ontwerp) diagonale skuifkrake by swigting. Die evaluasie van die waargenome swigmeganisme toon verskeie ooreenkomste met die swiglynteorie vir buig, waarin die waargenome swigmeganisme van blaaie gebruik word om die grenswigwaarde te bepaal. Dit word voorsien dat die model op soortgelyke wyse as die swiglynteorie gebruik sal word, in soverre beide geskik is om grensswigtoestande in ongewone gevalle te toets. Die noodsaak vir die gebruik van hierdie benaderings hang af van die oordeel van die ingenieur.

Loading full text...

Full text loading...

Loading

Article metrics loading...

/content/civeng1/29/4/EJC25024
1987-04-01
2016-12-11

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error