CAJ | 학술논문

为了研究钢筋混凝土结构在火灾作用下的力学性能,利用弹塑性理论,根据材料不同的屈服法则,分别给出了钢筋和混凝土材料考虑温度变形和徐变变形热弹塑性问题的增量本构方程.考虑钢筋和混凝土力学性能随温度的变化,编制程序对钢筋混凝土简支板进行了非线性分析,并利用相关文献的试验结果,对本构方程的正确性和适用性进行了验证.对火灾作用下1榀单层单跨钢筋混凝土框架进行了非线性分析,并给出了部分节点位移随受火时间的变化规律.结果表明,钢筋混凝土结构在高温下会产生很大变形,钢筋混凝土框架梁柱节点位移随受火时间变化的曲线并不是呈单调变化趋势,有拐点存在,梁柱节点竖向位移值小于梁跨中节点值.
위료연구강근혼응토결구재화재작용하적역학성능,이용탄소성이론,근거재료불동적굴복법칙,분별급출료강근화혼응토재료고필온도변형화서변변형열탄소성문제적증량본구방정.고필강근화혼응토역학성능수온도적변화,편제정서대강근혼응토간지판진행료비선성분석,병이용상관문헌적시험결과,대본구방정적정학성화괄용성진행료험증.대화재작용하1품단층단과강근혼응토광가진행료비선성분석,병급출료부분절점위이수수화시간적변화규률.결과표명,강근혼응토결구재고온하회산생흔대변형,강근혼응토광가량주절점위이수수화시간변화적곡선병불시정단조변화추세,유괴점존재,량주절점수향위이치소우량과중절점치.
To investigate the mechanical behavior of reinforced concrete structure subjected to fire, the incremental thermo-elastic-plastic creep constitutive equations of steel and concrete in consideration of temperature and creep deformation were obtained based on different yield rules and the elastic-plastic theories. The nonlinear analysis for reinforced concrete simply supported slab was carried out with consideration the variation of the mechanical properties of steel and concrete with temperature. The effectiveness and applicability of the constitutive equations were verified with the test results from relevant literature. The nonlinear analysis was employed for one-bay one-storey reinforced concrete frame under fire and the variation of displacement at partial nodes was analysed. It was found that the reinforced concrete structure at a high temperature would have a significant deformation. And the displacement change curves of beam-column joints of reinforced concrete frame were not monotonous trend and there were inflexion points. The vertical displacement values of beam-column joints were less than those at midspan of cross-beam.