摘要
采用有限元软件ABAQUS对火灾下钢筋混凝土墙的变形全过程进行了计算,计算结果与以往实验结果吻合较好。在此基础上,系统分析了轴压比、侧向荷载比、高厚比、墙厚度、混凝土抗压强度、钢筋屈服强度、配筋率和混凝土保护层厚度对钢筋混凝土墙变形和耐火极限的影响规律。研究结果表明,受火过程中,钢筋混凝土墙在无侧向荷载且轴压比或墙厚度较大、高厚比较小等情况下容易发生反向挠度现象,在工程常用参数范围内,墙耐火极限随着轴压比、侧向荷载比、高厚比、钢筋屈服强度或配筋率的增加而减小,随着墙厚度或混凝土强度的增加而增加。
The finite element software ABAQUS is used to calculate the deformation of reinforced concrete walls under fire.The calculated results agree well with previous experimental results.Based on the finite element model,the influences of such parameters as axial load level,lateral load level,height-to-thickness ratio,wall thickness,concrete compressive strength,steel reinforcement yield strength,steel reinforcement ratio and concrete protection thickness on deformation and fire resistance of walls are analyzed systematically.It is found that,under the conditions of big axial load level or wall thickness without lateral load and small height-to-thickness ratio,the reverse deflection of reinforced concrete walls in fire is apt to occur.Within the work range of parameters in common use,the fire resistance of walls decreases with the increase of axial load level,lateral load level,height-to-thickness ratio,steel reinforcement yield strength or steel reinforcement ratio,and increases with the increase of wall thickness or concrete compressive strength.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第1期24-30,共7页
Journal of Civil,Architectural & Environment Engineering
基金
福建省高校服务海西建设重点项目(闽教高[2009]8号)
福建省教育厅科技项目(JA08172)
福建工程学院预研基金项目(GY-Z09071)
关键词
钢筋混凝土
墙
计算模型
影响因素
有限元
reinforced concrete
walls
computational model
influencing factors
finite element
