1887

oa Civil Engineer in South Africa - Proposed calculation method for deflections : deflections of reinforced concrete members : paper 1

Volume 27, Issue 6
  • ISSN : 0009-7845

 

Abstract

A new simplified method for long-term deflection calculations of reinforced concrete members is presented. The method defines a modular ratio for creep conditions based on laboratory verified strain distributions in beams for both immediate and long-term conditions. A simple formula is derived for the ratio of long term to immediate deflections. A value for the creep factor has to be assumed but a series of curves is recommended that relates the creep factor to ambient relative humidity, age of loading and surface area to volume ratio of the member. Calculated deflections using the method are compared with laboratory measured values reported in the literature.

'n Vereenvoudige metode om lang-termyn defleksies van gewapende beton balke te bereken word aangebied. Die metode definieer 'n modulêre verhouding vir kruiptoestande gebaseer op laboratorium- gemete vervormings deur die diepte van die balk. 'n Eenvoudige formule word afgelei vir die verhouding tussen lang- en kort-termyn defleksies. 'n Waarde vir die kruipfaktor moet aangeneem word maar 'n reeks kurwes word aanbeveel vir gebruik wat die kruipfaktor koppel aan relatiewe humiditeit, ouderdom van die beton met belasting en volume tot area verhouding van die element. Berekende defleksies word vergelyk met laboratoriumgemete defleksies soos gerapporteer in die literatuur.

Loading full text...

Full text loading...

Loading

Article metrics loading...

/content/civeng1/27/6/EJC24995
1985-06-01
2016-12-10

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