摘要
为计算火灾后及修复加固后型钢混凝土柱的承载能力和抗弯刚度,该文基于结构受火和受力的连续性,提出了火灾后和加固后型钢混凝土(SRC)柱力学性能的分析流程,采用有限元方法建立了相应的分析模型;并以某受火后的型钢混凝土柱为例,对比分析了火灾前、火灾后和加固后型钢混凝土柱的承载能力和抗弯刚度,获得了使用阶段抗弯刚度和不同轴向荷载比下截面极限抗弯承载力火灾后的损失率和加固后的提高率;在轴向荷载比为0～0.4时,其截面极限抗弯承载力的损失率和提高率分别为4.1%～6.4%和3.9%～9.1%。该文的分析流程和方法可为该类结构火灾后和加固后的力学性能分析提供参考。
An analysis procedure was developed for steel reinforced concrete （SRC） columns after exposure to fire and subsequent strengthening to calculate the bearing capacity and flexural stiffness of SRC columns after exposure to fire. A finite element analysis （FEA） model was then developed for steel reinforced concrete columns during and after fires. The bearing capacity and stiffness of an SRC column after exposure to a fire are analyzed using the FEA model to predict the flexural stiffness and ultimate flexural capacity loss ratios after exposure to fire and the increases after strengthening for axial loads. The loss ratios are 4.1%- 6.4% which the ultimate flexural capacity increases by 3.9%- 9.1% for axial load ratios of 0 - 0.4. This analysis can be used for further analyses of steel concrete composite structures after exposure to fire and subsequent strengthening.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第1期12-17,共6页
Journal of Tsinghua University(Science and Technology)
基金
"十二五"国家科技支撑计划项目(2012BAJ07B01)
