摘要
通过一根小偏压型钢混凝土柱的抗火全过程试验,其中包含常温加载、恒载升温、恒载降温和高温后再加载等几个过程,用以模拟构件真实的受火情况。测试了常温下构件的应变、各阶段构件的变形和升降温阶段截面温度场的分布,观察了混凝土爆裂等试验现象和构件破坏过程。结果表明,截面上各点的最高温度和达到最高温度的时间有所不同,在时间呈现出一定的滞后效应;在降温段构件变形有继续增大的趋势;混凝土的爆裂是影响构件抗火性能的一个重要因素;降温后存在较大的残余变形量。
To stimulate the behavior of SRC columns under the real fire hazard,the paper presented a full process test of the low eccentric compression SRC column under and after fire exposure,including the loading at constant temperature,the temperature elevating and falling in the constant load and re-loading after high temperature.The paper tested the strain of components,the component deflections in different periods under the constant tempera-ture,and the distribution of the temperature field of cross sections during the temperature elevating and falling,and observed the concrete spalling of the specimen and the process of the component damage.The results show that the highest temperature and the time to reach the highest temperature at different cross sections are different,showing a certain delay of time.The deflection of the component tends to increase during the falling stage;the concrete spalling is an important factor to the behavior of SRC column under fire;a big residual deflection still exits after cooling down.
出处
《苏州科技学院学报（工程技术版）》
CAS
2010年第3期59-61,67,共4页
Journal of Suzhou University of Science and Technology （Engineering and Technology）
基金
国家自然科学基金(50708062)
苏州市高层次人才项目(50708062)
关键词
型钢混凝土柱
试验研究
火灾作用全过程
力学性能
steel reinforced concrete columns
experimental study
full process under and after fire
mechanical properties
