摘要
建立了一个理想的完全约束的钢筋混凝土柱模型,并采用这个模型对实际结构中轴心受压柱的耐火极限进行了预测和分析。研究结果表明,在截面尺寸、纵筋配筋率、保护层厚度及混凝土抗压强度等诸多因素中,保护层厚度是影响实际结构中轴心受压柱的耐火极限的最主要因素。而我国现行的设计防火规范是以截面尺寸为主要指标对钢筋混凝土柱的耐火极限进行规定,因此,建议我国的设计防火规范对钢筋混凝土柱的耐火极限进行规定时加入对保护层厚度的要求,同时建议加入防止柱表面爆裂的措施。
An ideal model of a totally restrained reinforced concrete column is proposed in this paper. Based upon the model, the limit of fire resistance of a restrained column in a system is predicted and analyzed. It is concluded that the concrete cover is the main factor affecting the limit of fire resistance of reinforced concrete columns under axial load. So it is suggested that code of China for fire protection design take the concrete cover into consideration on the regulation of reinforced concrete columns. And the regulations on preventing fire - exposed concrete from spalling should be included.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2005年第5期36-40,共5页
Journal of Railway Science and Engineering
基金
湖南省建设厅重点资助项目(湘建科(2004)-16)
关键词
约束
钢筋混凝土
柱
耐火极限
restraint
reinforced concrete
columns
limit of fire resistance
