VALIDATION OF THE HONG KONG (HKBD) AND JAPANESE (JSCE) CODE CONCRETE CREEP PREDICTION MODELS

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Creep strain, a requirement of the concrete design process, is a complex phenomenon that has proven difficult to model. Although laboratory tests may be undertaken to quantify creep magnitude, these are generally expensive and not a practical option. Hence, empirical code-type prediction models are used to predict creep strain. This paper considers the accuracy of the Hong Kong Code of Practice Model (HKBD, 2020 [1]) and the Japan Society of Civil Engineers Standard Specification for Concrete Structures (JSCE, 2010 [2]). In the case of the JSCE, two models were considered, one applicable to normal strength concretes (referred to as JSCE) and the subsequently introduced model which is applicable to high strength concretes (> 55 MPa), referred to as JSCE HS. The models were evaluated, when compared with the actual creep strains measured, over a period of approximately six months, on a range of concretes under laboratory-controlled conditions, for six mixes (comprising three aggregate types and two water-cement ratios). The HKBD and JSCE models generally over-predicted specific creep at all ages. Furthermore, the JSCE HS generally slightly over-predicted specific creep for the first 28 days and then under-predicted thereafter. The HKBD model was found to be the least accurate with an overall coefficient of variation (ωall) of 56.2%. The relatively simple JSCE HS, which was applied to all six of the mixes, of which only one mix classified as high strength, was the most accurate model with a ωall of 21.8%. The JSCE model was less accurate than the JSCE HS, yielding a ωall of 30.2%. When comparing the accuracy of the three models investigated to the accuracy of 17 other international code-type models that were previously investigated by the author, the JSCE HS was the second most accurate and the HKBD was ranked 17th in terms of accuracy (of the 20 models considered), respectively.

Original languageEnglish
Title of host publicationProceedings for the 6th fib International Congress, 2022- Concrete Innovation for Sustainability
EditorsStine Stokkeland, Henny Cathrine Braarud
Publisherfib. The International Federation for Structural Concrete
Pages1621-1630
Number of pages10
ISBN (Print)9782940643158
Publication statusPublished - 2022
Event6th fib International Congress on Concrete Innovation for Sustainability, 2022 - Oslo, Norway
Duration: 12 Jun 202216 Jun 2022

Publication series

Namefib Symposium
ISSN (Print)2617-4820

Conference

Conference6th fib International Congress on Concrete Innovation for Sustainability, 2022
Country/TerritoryNorway
CityOslo
Period12/06/2216/06/22

Keywords

  • Codes
  • Concrete
  • Creep
  • MEASURED HKBD JSCE JSCE HS
  • Models
  • Structural design

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science (miscellaneous)

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