EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF COLD-FORMED STEEL STUB COLUMNS WITH OPEN SECTIONS AFTER A FIRE

ZHANG Jiahui; GE Zujing

doi:10.13204/j.gyjzG20030706

Volume 51 Issue 5

Sep. 2021

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ZHANG Jiahui, GE Zujing. EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF COLD-FORMED STEEL STUB COLUMNS WITH OPEN SECTIONS AFTER A FIRE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 99-107. doi: 10.13204/j.gyjzG20030706

Citation:

ZHANG Jiahui, GE Zujing. EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF COLD-FORMED STEEL STUB COLUMNS WITH OPEN SECTIONS AFTER A FIRE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 99-107. doi: 10.13204/j.gyjzG20030706

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EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF COLD-FORMED STEEL STUB COLUMNS WITH OPEN SECTIONS AFTER A FIRE

doi: 10.13204/j.gyjzG20030706

School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China

Received Date: 2020-03-07
Available Online: 2021-09-16
Publish Date: 2021-09-16

Abstract

Abstract

A series of compression tests were conducted at ambient temperature to investigate the mechanical properties of cold-formed steel stub columns after a fire. The test specimens, including three types of 45 stub columns with open sections, were heated to the pre-selected temperature and then the compression tests were conducted on the specimens after cooling. Seven specified temperatures and two duration times were adopted in the test program to study the relations between the bearing capacity of components and the parameters of temperature field. The effects of longitudinal stiffeners on the local stability and fire resistance of open sections were also evaluated. The test results showed that:1) the heating temperature and duration time greatly affected the bearing capacity of stub columns; 2) the deterioration of material properties was not the only attribute that the stub columns lost their bearing capacity after being exposed to fire; 3) longitudinal stiffeners could improve the local stability of open sections, and web stiffeners performed better. The test results were also used to evaluate the appropriateness of the direst strength method (DSM). This evaluation showed that the mass loss of specimens should be taken into account in the design calculation when the heating temperature was above 700℃. It was also shown that the modified DSM, with consideration of the high-temperature effect, was accurate and reliable for calculating the bearing capacity of cold-formed steel stub columns with open sections.
- direct strength method,
- high-strength cold-formed steel,
- local stability,
- post-fire,
- stiffening

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References(17)

References

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