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高温后钢纤维混凝土压-剪复合受力研究

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为研究高温后钢纤维混凝土压剪复合受力下的力学性能,以压应力比和温度作为参数,对20组钢纤维混凝土分别开展直剪试验和压剪试验,对比分析不同试件的破坏形态,探究了温度和压应力比对剪切强度的影响,并基于3种理论建立了高温后钢纤维混凝土压剪复合应力状态下的破坏准则.结果表明压剪复合受力状态下,混凝土剪切强度主要由接触摩阻力贡献,钢纤维混凝土峰值剪切强度随压应力比增大而增大,随温度升高而降低;随着压应力增大,剪切面上摩阻系数降低,峰值剪切强度增长幅度降低.依据试验数据,对比基于不同理论所建立的高温后钢纤维混凝土压剪破坏准则,考虑精确度和适用性,基于应力不变理论建立的破坏准则效果最好.
RESEARCH ON THE COMPRESSIVE SHEAR COMPOSITE STRESS OF STEEL FIBER REINFORCED CONCRETE AFTER HIGH TEMPERATURES
This paper studies the steel fiber reinforced concrete(SFRC)after high temperature compressive shear composite mechanics performance under loading.Taking compressive ratio and temperature as the independent vari-able,20 SFRC samples are carried out direct shear tests and shear tests.The failure forms of different SFRC speci-mens are compared and analyzed,and the effectiveness of temperature and compressive stress ratio on shear strength is investigated.Based on three theories,the failure criterion of SFRC under combined compressive shear loading af-ter high temperature is established.The results indicate that SFRC shear strength is mainly composed of contact fric-tion force contribution in the state of combined compressive shear loading.With the compressive stress ratio increas-es,the peak shear strength of SFRC also increases,which decreases with the increase of temperature.With the in-crease of compressive stress,the friction coefficient on the shear plane exhibits a decrease,and the growth amplitude of the peak shear strength decreases.According to the testing data,the compressive shear failure criterias estab-lished based on different theories after high temperature SFRC are compared.Considering the accuracy and applica-bility,the failure criterion established based on the stress invariant theory is with the best effectiveness.

steel fiber reinforced concretecombined compression-shear loadingconcrete shear strength

尹海旭、高立堂

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青岛理工大学土木工程学院,山东青岛 266520

钢纤维混凝土 压剪复合受力 混凝土剪切强度

2024

低温建筑技术
黑龙江省寒地建筑科学研究院

低温建筑技术

影响因子:0.237
ISSN:1001-6864
年,卷(期):2024.46(2)
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