冷成型钢开口截面短柱高温后力学性能试验研究

张佳慧; 葛祖静

doi:10.13204/j.gyjzG20030706

冷成型钢开口截面短柱高温后力学性能试验研究

doi: 10.13204/j.gyjzG20030706

上海理工大学环境与建筑学院, 上海 200093

基金项目:

国家自然科学基金资助项目（51508328）。

详细信息

作者简介:
张佳慧,男,1981年出生,讲师。电子信箱:zhangjh316@163.com

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出版历程
- 收稿日期: 2020-03-07
- 网络出版日期: 2021-09-16
- 刊出日期: 2021-09-16

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

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

摘要

摘要: 为了研究冷成型钢轴压构件的高温后力学行为，对45根开口截面短柱加热至预定温度，冷却后再进行轴压测试。试验设定7种加热温度和两种保温时间，探究温度场参数与构件承载力之间的关系。考察不同加劲模式下，三种开口截面构件的抗火性能和局部稳定性。试验结果表明：1）加热温度和保温时间均可显著影响构件承载力；2）不可把构件承载力的下降简单等同于材性的衰减；3）纵向加劲可以改善开口截面构件的局部稳定性，且腹板加劲的作用更明显。同时利用试验结果评估直接强度法的适用性，可以发现：承载力计算时，对经历温度在700℃以上的试件必须考虑温度引起的构件质量损失；考虑高温效应的修正直接强度法能够提供比较精确和可靠的开口截面高温后承载力计算值。
- 直接强度法 /
- 高强冷成型钢 /
- 局部稳定 /
- 高温后 /
- 加劲
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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参考文献(17)

[1]	中华人民共和国住房和城乡建设部.钢结构设计标准:GB 50017-2017[S]. 北京:中国建筑工业出版社, 2018.
[2]	中华人民共和国建设部.冷弯薄壁型钢结构技术规范:GB 50018-2002[S]. 北京:中国计划出版社, 2002.
[3]	AISI. North American Specification for the Design of Cold-Formed Steel Structural Members:AISI S100-16[S]. Washington, D.C; American Iron and Steel Institute, 2016.
[4]	AS/NZS. Cold-Formed Steel Structures:AS/NZS 4600:2005[S].Sydney:Australian/New Zealand Standard, 2005.
[5]	EC3. Euro Code 3:Design of Steel Structures-Part 1.2:General Rules-Structural Fire Design:DD ENV 1993-1-2:2001[S]. CEN, Brussels:European Committee for Standardization, 2001.
[6]	QIANG X, BIJLAARD F S K, KOLSTEIN H. Post-Fire Mechanical Properties of High Strength Structural Steels S460 and S690[J]. Engineering Structures, 2012, 35:1-10.
[7]	QIANG X, BIJLAARD F S K, KOLSTEIN H. Post-Fire Performance of Very High Strength Steel S960[J]. Journal of Constructional Steel Research, 2013, 80(1):235-242.
[8]	WANG W, LIU T, LIU J. Experimental Study on Post-Fire Mechanical Properties of High Strength Q460 Steel[J]. Journal of Constructional Steel Research, 2015, 114:100-109.
[9]	李国强, 黄雷, 张超. 国产Q690高强钢高温下力学性能试验研究[J]. 建筑结构学报, 2020(2):149-156.
[10]	GUNALAN S, MAHENDRAN M. Experimental Investigation of Post-Fire Mechanical Properties of Cold-Formed Steels[J]. Thin-Walled Structures, 2014, 84:241-254.
[11]	KESAWAN S, MAHENDRAN M. Post-Fire Mechanical Properties of Cold-Formed Steel Hollow Sections[J]. Construction & Building Materials, 2018, 161:26-36.
[12]	张佳慧, 盛孝耀.双相冷成型钢高温后力学性能试验研究[J/OL]. 建筑钢结构进展. http://kns.cnki.net/kcms/detail/31.1893.tu.20190528.1639.006.html.
[13]	WANG W, ZHANG L, GE Y, et al. Behaviour of Restrained High Strength Steel Columns at Elevated Temperature[J]. Journal of Constructional Steel Research, 2018, 148:251-264.
[14]	王卫永, 张琳博, 李国强. 高强度Q690钢柱耐火性能试验研究[J]. 建筑结构学报, 2019(8):155-162.
[15]	GUNALAN S, HEVA Y B, MAHENDRAN M. Local Buckling Studies of Cold-Formed Steel Compression Members at Elevated Temperatures[J]. Journal of Constructional Steel Research, 2009, 65(2):249-259.
[16]	CRAVEIRO H D, RODRIGUES J P C, LAIM L. Cold-Formed Steel Columns Made with Open Cross-Sections Subjected to Fire[J]. Thin-Walled Structures, 2014, 85:1-14.
[17]	SCHAFER B W, PEKOZ T. Direct Strength Prediction of Cold-Formed Steel Members Using Numerical Elastic Buckling Solutions[C]//Proceedings of the 14th International Specialty Conference on Cold-Formed Steel Structures. St. Louis, MO, USA:University of Missouri-Rolla, 1998:69-76.