1887

oa Civil Engineer in South Africa - Computer analysis of the time-dependent behaviour of concrete structures

 

Abstract

Due to the nature or construction sequence of certain concrete structures it is necessary to include time-dependent effects in the analysis. This involves a considerable amount of numerical work which has to be done by computer. A method which can be used effectively with the stiffness method of structural analysis was coded and used for the analysis of segmentally erected bridges. Creep and shrinkage of concrete as well as material changes and temperature effects are taken into account. Efficient use of computer memory is obtained by storing the entire stress history in only a few variables at each integration point. A significant improvement in the results was obtained when the time-dependent effects were included in the analysis of a segmentally erected bridge. The method is suitable for a wide variety of structures.

As gevolg van die aard of konstruksievolgorde van sommige betonstrukture is dit noodsaaklik dat tyd-afhanklike faktore by die analise ingesluit word. Dit verg heelwat numeriese werk wat met 'n rekenaar gedoen moet word. 'n Metode wat op effektiewe wyse saam met die styfheidsmetode van struktuuranalise gebruik kan word is programmeer vir die analise van brûe opgerig deur middel van segmentkonstruksie. Die kruip en krimp van beton asook materiaal veranderings en temperatuurwisselings is in aanmerking geneem. Effektiewe gebruik van rekenaargeheue word verkry deur die spanningsrekord in net 'n paar veranderlikes by elke integrasiepunt te stoor. 'n Betekenisvolle verbetering in die resultate vir die analise van 'n segmentbrug is verkry deur tyd-afhanklike faktore in te sluit. Die metode is geskik vir 'n wye verskeidenheid strukture.

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/content/civeng1/21/3/EJC24765
1979-03-01
2016-12-09
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