Stress analysis of steel fiber reinforced concrete encased tubular steel penstocks under internal water pressure

Jianguo Dai, H. N. He

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Reinforced concrete encased steel penstocks (RC-ESPs), which are usually laid on the downstream surfaces of dams, have been applied in many large hydraulic projects including the famous "The Three Gorge Project" of the Chinese mainland. Compared to conventional steel penstocks, which are usually embedded in dams, RC-ESPs are easier to construct, cost-effective and more safe and durable. However, a difficulty encountered in engineering practice for such a composite structure is in the crack control of the exterior reinforced concrete (RC) wall. To solve such a problem, steel fiber reinforced concrete (SFRC) can be used to replace the conventional concrete of the external RC wall to form a new type of structure: steel fiber reinforced concrete encased steel penstocks (SFRC-ESPs). The objective of this paper is to develop generic analytical models for analyzing the SFRC encased tubular steel penstocks (SFRC-ETSPs) under internal water pressure. A tri-linear curve is assumed in the models to describe the behavior of SFRC under tension. Based upon the developed models the strains and stresses of all the structural components, including the encased steel penstock and the steel reinforcement and SFRC in the exterior RC wall, can be predicted under different levels of internal water pressure. The analytical models provide a sound basis for designing the serviceability and safety of the SFRC-ETSPs.
Original languageEnglish
Title of host publicationICASS '09/IJSSD - Proceedings of Sixth International Conference on Advances in Steel Structures and Progress in Structural Stability and Dynamics
Pages560-567
Number of pages8
Publication statusPublished - 1 Dec 2009
Event6th International Conference on Advances in Steel Structures and Progress in Structural Stability and Dynamics, ICASS 2009 - Hong Kong, Hong Kong
Duration: 16 Dec 200918 Dec 2009

Conference

Conference6th International Conference on Advances in Steel Structures and Progress in Structural Stability and Dynamics, ICASS 2009
Country/TerritoryHong Kong
CityHong Kong
Period16/12/0918/12/09

Keywords

  • Internal water pressure
  • Reinforced concrete
  • Steel fiber reinforced concrete
  • Steel penstock
  • Tubular

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

Cite this