CAJ | 학술논문

介绍了大跨径钢管混凝土拱桥失稳破坏的2种类型：平衡分支点失稳（第一类稳定性问题）和极值点失稳（第二类稳定性问题）。采用统一的钢管混凝土本构关系，以张（家界）至花（垣）高速公路猛洞河大桥为例建立有限元模型。对结构在弹性状态、几何非线性与材料非线性状态下的两类稳定性问题进行了探讨。分析表明：研究大跨径钢管混凝土拱桥的稳定性时，可不考虑几何非线性的影响，但材料非线性的作用不容忽视。同时，研究了混凝土强度、钢管强度、含钢率、矢跨比、初始缺陷对结构稳定性的影响作用。
개소료대과경강관혼응토공교실은파배적2충류형：평형분지점실은（제일류은정성문제）화겁치점실은（제이류은정성문제）。채용통일적강관혼응토본구관계，이장（가계）지화（원）고속공로맹동하대교위례건립유한원모형。대결구재탄성상태、궤하비선성여재료비선성상태하적량류은정성문제진행료탐토。분석표명：연구대과경강관혼응토공교적은정성시，가불고필궤하비선성적영향，단재료비선성적작용불용홀시。동시，연구료혼응토강도、강관강도、함강솔、시과비、초시결함대결구은정성적영향작용。
This paper describes two types of the Long-span concrete filled steel tubular arch bridge instability failure:unstable equilibrium branch point (first kind stability issues)and extreme point insta-bility (second kind stability problems).By applying unified constitutive relations of concrete filled steel tubular,Create a finite element model in connection with the Mengdong river Bridge of Zhangjiajie to Hu-ayuan expressway.The stability of structure in linear elastic,geometric nonlinearity and material nonlin-earity are discussed,The results showed that when the stability of Long-span concrete filled steel tubular arch bridge are considered,geometric nonlinear effects can be neglected,but the role of material nonlin-earity should be considered.Meanwhile,this paper discusses the coefficient of stability to concrete strength,steel strength,steel ratio,span-ratio and initial defect.