Time-dependent behavior of pretensioned stainless steel bars used for structural rehabilitation and retrofitting

Duplex stainless steel;Stainless steel;Viscoelasticity;Stress relaxation;Low homologous temperature stress relaxation;Structural strengthening

Shah, Falak Dipak ; Zureick, Abdul-Hamid Ellingwood, Bruce R. Civil and Environmental Engineering Neu, Richard W. Singh, Preet M. Suryanarayana, Phanish ; Zureick, Abdul-Hamid

University:Georgia Institute of Technology

Department:Civil and Environmental Engineering

关键词: Duplex stainless steel;    Stainless steel;    Viscoelasticity;    Stress relaxation;    Low homologous temperature stress relaxation;    Structural strengthening;   

Others  :  https://smartech.gatech.edu/bitstream/1853/53063/1/SHAH-DISSERTATION-2014.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

The objective of this study is to characterize the long-term behavior of an austenitic-ferritic stainless steel-based pretensioned system for strengthening reinforced concrete bridge pier caps in shear. Stress relaxation experiments were conducted on UNS S32101 stainless steel bars subjected to various initial stresses and temperatures within the low homologous temperature (LHT) regime. Data from these experiments were used to develop a viscoplastic constitutive model to describe the long-term time- and temperature-dependent behavior of the stainless steel bars. This mechanics-based approach is integrated with an analytical method based on strut-and-tie analysis to compute the shear strength of reinforced concrete pier caps strengthened with this external pretensioned system.