摘要
由于结构的高次超静定,处于结构整体中的约束构件与单个独立构件的抗火性能具有很大不同,这已在Cardinton试验以及一些火灾现象中得到了证实。影响约束组合梁抗火性能的参数很多,采用试验的方法研究这些参数的影响代价很高,本文利用经过试验检验的理论分析方法分析了荷载比、约束刚度、钢梁与混凝土相对面积比等对约束组合梁抗火性能的影响。并根据参数分析结果给出了考虑结构整体性影响的组合梁抗火实用计算方法,最后通过实例说明了实用抗火计算方法的应用。
A lot of fire accidents and fire-tests have revealed that the behavior of members restrained in redundant structures is much different from that of isolated members. The load ratio, restraint stiffness, ratio of steel and concrete cross-sectional area have a great effect on the behavior of restrained steel-concrete composite beams in fire. Although it is commonly acceptable to employ the experimental approach for the purpose of the study on the effect mentioned hereinbefore,it is too costly. In this paper the behavior of composite beams in fire is studied by a theoretical method. Through parametric investigations,a practical method for assessing the behavior of composite beams in fire is proposed in this paper.
出处
《建筑钢结构进展》
2008年第2期36-43,共8页
Progress in Steel Building Structures
基金
国家自然科学基金创新研究群体项目(50321803)
国家自然科学基金重点项目(50738005)
关键词
组合梁
参数分析
整体性
实用计算方法
composite beam
parameter analysis
redundant structures
practical method
