摘要
为了得到火灾下防火涂料局部破损后钢柱的承载力,根据平衡微分方程,对防火涂料破损后有初弯曲和荷载偏心的两端铰接钢柱的极限承载力进行了计算和分析。并用ANSYS有限元对计算结果进行了验证,二者吻合较好。对影响承载力的参数:破损长度、破损段温度、初弯曲、荷载偏心和长细比等进行了分析。结果表明:防火涂料破损后,钢柱在火灾下承载力下降;温度越高,下降越明显;柱的初始弯曲和荷载偏心对承载力影响较大,但随着温度的升高这一影响变小;随着长细比的增加,承载力降低。
In order to understand the bearing capacity of steel column in fire after partial damage of fire retardant coating （FRC）, calculation and analysis using differential equation of equilibrium are carded out to predict the bearing capacity of hinged steel column with initial flexure and load eccentricity suffering partial damage of FRC. The result is verified by employing ANSYS and good agreement is achieved. The parameters affecting the ultimate bearing capacity are analyzed, including damage length of FRC, temperature of column with damage of FRC, initial flexure, load eccentricity and slenderness ratio. The results show that the bearing capacity of column is reduced significantly when the FRC is damaged in fire, especially at the high temperature. Initial flexure and load eccentricity have great impact on the bearing capacity, but the influence decreases with the elevation of temperature. The bearing capacity is also reduced with the increase of slenderness ratio.
出处
《工程力学》
EI
CSCD
北大核心
2008年第12期72-78,共7页
Engineering Mechanics
基金
国家创新研究群体科学基金(50621062)
国家自然科学基金资助(50738005)
重庆大学人才引进基金(0903005104771)
关键词
防火涂料
钢柱
承载力
初弯曲
荷载偏心
fire retardant coating
steel column
bearing capacity
initial flexure
load eccentricity
