摘要
高强混凝土(HSC)柱在高温下会产生爆裂,缩短柱子的耐火极限,研究发现爆裂的随机性也使得数值模拟有一定的难度。应用ABAQUS建立了考虑高温爆裂的HSC柱有限元模型,并得到实验数据的验证。应用验证后的模型,分析了爆裂对温度场的影响,以及爆裂长度和爆裂深度对四面受火HSC柱耐火性能的影响。结果表明:爆裂后截面温度随爆裂深度的增大而逐渐上升;在相同爆裂深度下,随着爆裂长度的增加,HSC柱耐火极限减小,轴向位移增加;相同爆裂长度下,随着爆裂深度的增加,HSC柱耐火极限有较大降低。
Abstract： Spalling occurs when high strength concrete （HSC） columns are exposed to fire, which decreases the fire resistance of columns. Studies show that the numerical modeling becomes difficult because of the randomness of spalling. In this paper, the finite element software ABAQUS was used to develop the model for numerical anal- ysis of HSC columns related to the spalling and the model was verified by test data. The verified model was then used to analyze the effect of spalling on the temperature field, the effect of the length and depth of spalling on the fire resistance and axial deformation. The result shows that the temperature of cross section rises when the depth of the spalling increases. On condition that keeps the same depth of spalling invariability, with the increase of the spalling length, the fire resistance reduces and the axial deformation increases. On condition that keeps the length of spalling invariability, the fire resistance of HSC columns decreases significantly with the increase of the spalling depth.
出处
《苏州科技学院学报（工程技术版）》
CAS
2013年第2期5-8,80,共5页
Journal of Suzhou University of Science and Technology （Engineering and Technology）
基金
国家自然科学基金资助项目(51278321)
江苏省"青蓝工程"青年学术带头人项目(2010-27)
江苏省"333工程"青年学术带头人项目(2011-34)
江苏省普通高校研究生科研创新计划项目(CXZZ11_0953)
关键词
高强混凝土柱
耐火极限
爆裂
温度场
high strength concrete columns
fire resistance
spalling
temperature field
