Advanced Steel Construction

Vol. 19, No. 1, pp. 9-16 (2023)


 EXPERIMENTAL INVESTIGATION ON MECHANICAL

PROPERTIES OF GRADE 1670 STEEL WIRES UNDER AND

AFTER ELEVATED TEMPERATURE

 

Er-Feng Du 1, *, Xiao-Bo Hu 2, Zhong Zhou 2 , Qian Li 2, Xiao Lyu 3 and Yi-Qun Tang 2

1 China-Pakistan Belt and Road Joint Laboratory on Smart Disaster Prevention of Major Infrastructures, Southeast University, Nanjing, China

2 School of Civil Engineering, Southeast University, Nanjing, China

3 School of Civil Engineering, Shandong Jianzhu University, Ji’nan, China

* (Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 20 July 2022; Revised: 22 August 2022; Accepted: 10 January 2023

 

DOI:10.18057/IJASC.2023.19.1.2

 

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ABSTRACT

Grade 1670 steel wires were selected for elevated-temperature and post-elevated-temperature tensile tests. The test data were analyzed through comparison with the results in existing literatures. The elevated-temperature test results indicate that, mechanical properties of the steel wires degraded with the increase of temperature. The mechanical behaviors of the steel wires degraded rapidly at the temperature exceeding 300°C, and the load-carrying ability was substantially lost when the temperature increased up to 700°C. In the post-elevated-temperature test, the modulus of the steel wire was almost completely recovered after cooling from the elevated temperatures. The nominal yield strength and ultimate strength degraded obviously after cooling from the temperature exceeding 400°C. Based on the test data, the reduction factors of the mechanical properties at and after elevated temperatures are fitted as a function of the temperature, and constitutive models of the steel wires are established. The results can provide technical supports for the analysis of fire performance of prestressed cable support structures, and their post-fire repair.

 

KEYWORDS

Steel wires, Elevated temperatures, Mechanical properties, Experimental research, Stress-strain curve


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