| 火灾高温后混凝土剩余强度及本构方程研究 |
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| 引用本文： | 杨倩,贾恒瑞,陈宗平.火灾高温后混凝土剩余强度及本构方程研究[J].混凝土与水泥制品,2022(3):28-33. |
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| 作者姓名： | 杨倩 贾恒瑞 陈宗平 |
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| 作者单位： | 广西职业师范学院土木建筑工程学院,广西南宁530007;广西建设职业技术学院,广西南宁530003;广西大学土木建筑工程学院,广西南宁530004;广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 |
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| 基金项目： | 国家自然科学基金项目（51578163）；;广西自然科学基金重点项目（2016GXNSFDA380032）； |
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| 摘 要： | 为了深入研究工程建设中几种C25～C40强度等级混凝土经历火灾高温后的力学性能变化规律,提出了相对精确的剩余强度计算方法和受压本构方程,以经历温度、混凝土强度等级、恒温时间为变化参数,设计并完成了120个棱柱体试件的轴压试验,分析了各变化参数对其峰值应力、轴压刚度及耗能能力的影响规律,并给出了相应的剩余强度计算公式和轴...
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| 关 键 词： | 轴压试验 高温试验 力学性能 本构方程 |
Study on Residual Strength and Constitutive Equation of Concrete After Elevated to High Temperatures |
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| YANG Qian,JIA Heng-rui,CHEN Zong-ping.Study on Residual Strength and Constitutive Equation of Concrete After Elevated to High Temperatures[J].China Concrete and Cement Products,2022(3):28-33. |
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| Authors: | YANG Qian JIA Heng-rui CHEN Zong-ping |
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| Affiliation: | (College of Civil Engineering and Architecture,Guangxi Vocational Normal University,Nanning 530007,China;Guangxi Polytechnic of Construction,Nanning 530003,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China) |
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| Abstract: | In order to further study the mechanical properties change rule of C25~C40 concrete after high temperature,more accurate residual strength calculation method and compression constitutive equation were put forward.Taking the experience temperature,concrete strength grade and constant temperature time as variable parameters,the axial compression tests of 120 specimens were designed and completed.The influence of various parameters on the peak stress,axial compression stiffness and energy dissipation capacity of concrete was analyzed.The corresponding residual strength calculation formula and the parameter values of axial compression stress-strain constitutive equation were given.The results show that the peak stress,axial compression stiffness and energy dissipation capacity of the specimens decrease gradually with the increase of experience temperature,and they decrease slightly at first and then increase with the increase of concrete strength grade.Increasing the constant temperature time is unfavorable to the axial compression mechanical properties of concrete,but the effect is not significant. |
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| Keywords: | Axial compressive test High temperature test Mechanical property Constitutive equation |
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