约束PEC柱轴力变化规律及影响因素  

Variation of axial force and analysis of related factors in restrained PEC columns subjected to standard fire

作　　者：毛小勇[1] 满建政[1] 金晓飞[1] 

机构地区：[1]苏州科技学院,江苏苏州215011

出　　处：《消防科学与技术》2012年第5期443-446,共4页Fire Science and Technology

基　　金：国家自然科学基金"基于全过程分析的高温后型钢混凝土柱力学性能及设计方法研究"(50708062);江苏省结构工程重点实验室开放课题"基于全过程分析的高温后SRC柱力学性能研究"(ZD0804);江苏省"青蓝工程"中青年带头人项目"型钢混凝土异形柱抗火性能研究"(2010-27);江苏省"333工程"中青年带头人项目"基于子结构模型的约束PEC柱抗火性能及设计方法研究"(2011-34)

摘　　要：为考察火灾下相邻构件约束对PEC柱轴力的影响,应用有限元软件ABAQUS建立了标准升温条件下约束PEC柱的数值分析模型,并用试验数据验证该模型。应用模型分析火灾荷载比、轴向/转动约束刚度比、长细比、偏心率对约束PEC柱轴力变化系数的影响规律。分析表明:约束导致柱轴力出现不同程度的增长;轴向约束刚度比、偏心率越大,轴力变化系数的峰值越大;荷载比越大,轴力变化系数的峰值越小;长细比、转动约束刚度比对轴力变化系数影响较小。Finite element model using ABAQUS software was proposed to investigate the influence of restraint induced by the adjoining members on the axial force of PEC（Partially Encased Concrete） columns,which was verified by test data.The verified model was then used to do parametric analysis including influence of load ratio,axial/bending restraint ratio,slenderness ration and eccentricity on the enhancement coefficient.Analysis show that axial force increases due to restraints.The increasing of axial restraint ratio and load eccentricity lead to a higher peak value of the enhancement coefficient,while the increasing of load ratio induces a lower enhancement coefficient.The slenderness ratio and bending restraint ratio have little influence.

关 键 词：PEC柱 约束 轴力 标准升温 

分 类 号：X913.4[环境科学与工程—安全科学] TU312[建筑科学—结构工程]