CAJ | 학술논문

根据混凝土单轴动力特性试验,引入了应变率的影响,对规范给出的混凝土应力一应变关系表达式进行了修正;针对只考虑混凝土的动态特性和既考虑混凝土的动态特性、也考虑钢筋的动态特性这两种情况,利用修正的表达式对钢筋混凝土柱的动态特性进行了数值分析.结果表明,混凝土的动态特性对于大偏心柱的承载力影响很小,但对于小偏心柱的极限承载力影响显著;钢筋的动态特性对大,小偏心柱的极限弯矩和极限曲率都有明显的影响.本文还分析了柱的极限弯矩、极限曲率和极限轴力随偏心距变化的规律.
근거혼응토단축동력특성시험,인입료응변솔적영향,대규범급출적혼응토응력일응변관계표체식진행료수정;침대지고필혼응토적동태특성화기고필혼응토적동태특성、야고필강근적동태특성저량충정황,이용수정적표체식대강근혼응토주적동태특성진행료수치분석.결과표명,혼응토적동태특성대우대편심주적승재력영향흔소,단대우소편심주적겁한승재력영향현저;강근적동태특성대대,소편심주적겁한만구화겁한곡솔도유명현적영향.본문환분석료주적겁한만구、겁한곡솔화겁한축력수편심거변화적규률.
According to the uniaxial dynamic experimental results of eoncrete,stress-strain relationship of concrete given by design code of reinforced concrete is modified taking into account the effect of strain rates of concrete.Then dynamic characteristics of reinforced concrete column are studied using the modified expression.Two situations are considered:(1)only dynamic characteristics of concrete are considered(2)dyrnamic characteristics of concrete and steel are considered.The result of numerical analysis shows that dynamic characteristics of concrete have little effect on the limit moment of large eccentricity column but have considerable effect on the limit moment of small eccentricity column.Nevertheless,dynamic characteristics of steel have obvious effect on limit moment and limit curvature of both large eccentricity column and small eccentricity column.At the same time,the change rule of limit moment,limit curvature and limit axial force varying with eccentric distance are also studied.