Title:
CORROSION FATIGUE LIFE PREDICTION METHOD AND SYSTEM FOR PRESTRESSED CONCRETE BRIDGE
Document Type and Number:
WIPO Patent Application WO/2020/042781
Kind Code:
A1
Abstract:
A corrosion fatigue life prediction method and system for a prestressed concrete bridge. The stress of a steel strand is divided into three parts: tensile stress caused by remaining effective prestress, elastic stress caused by fatigue load, and stress caused by plastic deformation of concrete in a compressive area. The remaining structure prestress is obtained by predicting the level of corrosion of the steel strand; a stress concentration factor is introduced to consider the effect of stress concentration caused by pitting corrosion, and an elastic stress growth model for the steel strand under the action of both corrosion and fatigue is provided; taking the cross-section loss of the steel strand as a fatigue damage parameter and considering the degradation of the elastic modulus of the concrete after fatigue, a plastic stress growth model for the steel strand is established; a failure criteria of concrete, steel strands and ordinary steel bars are clarified; and a life analysis method for a prestressed concrete bridge under corrosive environment and fatigue load is formed. The prediction method is reasonable and applicable, and can provide support for safety assessment of prestressed concrete bridges in service.
Inventors:
MA YAFEI (CN)
SU XIAOCHAO (CN)
WANG LEI (CN)
ZHANG JIANREN (CN)
GUO ZHONGZHAO (CN)
SU XIAOCHAO (CN)
WANG LEI (CN)
ZHANG JIANREN (CN)
GUO ZHONGZHAO (CN)
Application Number:
PCT/CN2019/096061
Publication Date:
March 05, 2020
Filing Date:
July 16, 2019
Export Citation:
Assignee:
CHANGSHA UNIV OF SCIENCE&TECHNOLOGY (CN)
International Classes:
G01N17/00; G01N3/32
Foreign References:
| CN109030333A | 2018-12-18 | |||
| CN106485029A | 2017-03-08 | |||
| CN108225906A | 2018-06-29 | |||
| CN105825030A | 2016-08-03 | |||
| CN108416110A | 2018-08-17 | |||
| KR101791878B1 | 2017-10-31 |
Other References:
MA, YAFEI: "Reliability Assessment and Life Prediction for Existing RC Bridges under Mutli-source Uncertainties", SCIENCE-ENGINEERING (B), CHINA DOCTORAL DISSERTATIONS FULL-TEXT DATABASE, 15 January 2015 (2015-01-15), pages 76 - 108, ISSN: 1674-022X
GUO, JINGJIE: "Durability Analysis of the Reinforced Concrete Bridges and Prediction of the Remaining Life", ENGINEERING TECHNOLOGY II, CHINA MASTER'S THESES FULL-TEXT DATABASE, 15 February 2010 (2010-02-15), pages 32 - 58, ISSN: 1674-0246
MA YAFEI ET AL.: "Fatigue life prediction for aging RC beams considering corrosive environments", ENGINEERING STRUCTURES, vol. 79, 1 September 2014 (2014-09-01), pages 211 - 221, XP029079699, ISSN: 0141-0296
GUO, JINGJIE: "Durability Analysis of the Reinforced Concrete Bridges and Prediction of the Remaining Life", ENGINEERING TECHNOLOGY II, CHINA MASTER'S THESES FULL-TEXT DATABASE, 15 February 2010 (2010-02-15), pages 32 - 58, ISSN: 1674-0246
MA YAFEI ET AL.: "Fatigue life prediction for aging RC beams considering corrosive environments", ENGINEERING STRUCTURES, vol. 79, 1 September 2014 (2014-09-01), pages 211 - 221, XP029079699, ISSN: 0141-0296
Attorney, Agent or Firm:
CHANGSHA ZONEKEY PATENT LAW FIRM (CN)
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