摘要
利用有限元软件ABAQUS建立包含部分梁、柱、板的约束PEC柱子结构顺序热-力耦合分析模型,计算了子结构轴向位移变化曲线和耐火极限。应用约束PEC柱抗火试验数据验证了模型的合理性。结果表明,随着荷载比的增加,柱轴向变形峰值和耐火极限减小;随着轴向约束刚度比的增加,柱轴向变形峰值减小,耐火极限增加;随着柱相对长细比的增大,柱轴向变形峰值增大,耐火极限减小;低轴向约束刚度比条件下,PEC柱耐火极限随着偏心率的增大而增大;高轴向约束刚度比条件下,PEC柱耐火极限随着偏心率的增大而减小。
By using the software ABAQUS, a sequentially coupled thermal-mechanical analysis model was established to calculate the axial deformation curves and fire resistance of the sub-structure including partial beams, retrained PEC columns and concrete floor slab. The model was validated by using the fire resistance test of PEC column. It can be seen from the research results that with the increase of load ratio, the peak value of axial deformation and fire resistance decreases; with the increase of axial restraint ratio, the peak value of axial deformation decreases and fire resistance increases; with the increase of relative slenderness, the peak value of axial deformation increa-ses and fire resistance decreases; under the condition of low axial restraint ratio, the greater the eccentricity ratio, the longer the fire resistance time; under the condition of high axial restraint ratio, the greater the eccentricity ratio, the shorter the fire resistance time.
出处
《消防科学与技术》
CAS
北大核心
2017年第3期287-292,共6页
Fire Science and Technology
基金
国家自然科学基金项目"基于子结构模型的约束PEC柱火灾全过程性能及抗火设计方法研究"(51278321)
江苏省"六大高峰"人才项目(2012-JZ-004)
江苏省高校自然科学基金重大项目(14KJA560003)
江苏省研究生科研创新计划项目(2013)
关键词
PEC柱
约束
子结构
抗火性能
参数
PEC columns
restrained
sub-structure
fire performance
parametric
