火灾后轴心受压钢柱加固二次受力分析  

Simulation Analysis on Reinforcement of Steel Column Under Axial Compression After Fire

作　　者：陈建锋[1] 周天华[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《施工技术》2014年第4期43-45,共3页Construction Technology

基　　金：中国博士后科学基金资助:钢结构连接火灾后承载性能研究(2011M501428)

摘　　要：对火灾受损钢柱采用焊接钢板的加大截面法加固,并利用非线性有限元法对构件加固过程进行了仿真研究。介绍了生死单元技术在构件加固二次受力分析中的运用。结果表明加固方案安全合理,火灾受损钢柱经加固后稳定承载力受原材料及后加固材料性能差异影响较大,此外,负荷加固中加固层应变滞后也是影响加固构件承载力的主要因素。The method of increasing section was used to strengthen damaged steel column post-fire. The strengthening process was simulated with nonlinear finite element method and element birth and death technology by considering secondary load. The result showed that the strengthen plan is reliable and rational,and the performance differences between raw material and reinforcing material influence on the stability bearing capacity of steel column. In addition,the enforcing layer strain hysteresis is the main factor affecting the bearing capacity of reinforced members.

关 键 词：加固 钢结构 火灾 二次受力 有限元法 

分 类 号：TU391[建筑科学—结构工程]