[1] He Zhenjun, Song Yupu,. Strength regularity and failure criterion of plain HSHPCunder biaxial compression after exposure to high temperatures [J]. Journal of Southeast University (English Edition), 2008, 24 (2): 206-211. [doi:10.3969/j.issn.1003-7985.2008.02.017]

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Strength regularity and failure criterion of plain HSHPCunder biaxial compression after exposure to high temperatures()

高温后高强高性能混凝土双轴压强度规律与破坏准则

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

24

Issue:

2008 2

Page:

206-211

Research Field:

Materials Sciences and Engineering

Publishing date:

2008-06-03

Info

Title:

Strength regularity and failure criterion of plain HSHPCunder biaxial compression after exposure to high temperatures

高温后高强高性能混凝土双轴压强度规律与破坏准则

Author(s):

He Zhenjun;  Song Yupu

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

何振军;  宋玉普

大连理工大学海岸与近海工程国家重点试验室, 大连116024

Keywords:

high-strength high-performance concrete(HSHPC);  high temperatures;  stress ratio;  uniaxial and biaxial compressive strength;  failure criterion

高强高性能混凝土;  高温;  应力比;  单双轴压强度;  破坏准则

PACS:

TU528.31;TU317+.3

DOI:

10.3969/j.issn.1003-7985.2008.02.017

Abstract:

Biaxial compression tests are performed on 100 mm×100 mm×100 mm cubic specimens of plain high-strength high-performance concrete(HSHPC)at seven kinds of stress ratios, σ₂2:σ₃3=0:-1, -0.20:-1, -0.30:-1, -0.40:-1, -0.50:-1, -0.75:-1, and -1.00:-1 after exposure to normal and high temperatures of 20, 200, 300, 400, 500 and 600 ℃, using a large static-dynamic true triaxial machine.Friction-reducing pads are three layers of plastic membranes with glycerine in-between for the compressive loading plane.Failure modes of the specimens are described.The two principally static compressive strengths are measured.The influences of the temperatures and stress ratios on the biaxial strengths of HSHPC after exposure to high temperatures are also analyzed.The experimental results show that the uniaxial compressive strength of plain HSHPC after exposure to high temperatures does not decrease completely with the increase in temperature; the ratios of the biaxial to its uniaxial compressive strengths depend on the stress ratios and brittleness-stiffness of HSHPC after exposure to different high temperatures.The formula of the Kupfer-Gerstle failure criterion modified with the temperature and stress ratio parameters for plain HSHPC is proposed.

利用大型静动真三轴试验机, 进行了常温20 ℃以及200, 300, 400, 500和600 ℃高温后高强高性能混凝土在7种应力比, σ₂:σ₃=0:-1, -0.20:-1, -0.30:-1, -0.40:-1, -0.50:-1, -0.75:-1, -1.00:-1双轴压试验.单双轴压试块尺寸为100 mm×100 mm×100 mm立方体.受压面的减摩垫层为3层塑料薄膜中间夹3层黄油.测得了双轴主压方向的静态强度, 剖析了温度和应力比对单、双轴压强度发展趋势的影响规律以及试件破坏形态.试验结果表明:随温度的升高, 高温后高强高性能混凝土的单轴压强度并不一定降低;双轴压强度相对于其单轴的提高倍数取决于应力比、不同温度等级后的高强高性能混凝土“脆硬性”.提出了修正的带有温度和应力比参数高强高性能混凝土Kupfer-Gerstle破坏准则公式.

References:

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Memo

Memo:

Biographies: He Zhenjun(1975—), male, graduate;Song Yupu(corresponding author), male, doctor, professor, syupu@dlut.edu.cn.
Citation: He Zhenjun, Song Yupu.Strength regularity and failure criterion of plain HSHPC under biaxial compression after exposure to high temperatures[J].Journal of Southeast University(English Edition), 2008, 24(2):206-211.

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