摘要
通过引入存在初始应力的钢管混凝土本构关系,研究了初始应力对钢管混凝土拱桥面内极限承载能力的影响．编制了能同时考虑几何非线性和材料非线性的有限元程序,并用此程序计算得出了无初始应力和存在初始应力情况下拱结构的荷载-位移曲线．结果表明初始应力对钢管混凝土拱桥的面内极限荷载值的大小影响较小,但对拱的变形影响较大,初始应力的存在增加了拱结构的塑性性能．可为进一步研究初始应力对钢管混凝土拱桥受力性能的影响提供参考．
This paper is concerned with the effects of the initial stress in steel tube on the in-plane ultimate bearing capacity of CFST （Concrete Filled Steel Tube） arch bridge, through the introduction of the constitutive equations of CFST with initial stress. A finite element program, which can take into account both the geometric nonlinearity and material nonlinearity, was made. Then the load-displacement curves of arch structure that had no initial stress and the curves of arch structure with initial stress were compared with the application of this program. The results showed that the influence of the initial stress of steel tube on the value of in-plane ultimate bearing capacity was not obvious, while the effect on the deformation of arch structure was great. And the arch structure displayed more plastic property because of the presence of the initial stress in steel tube. The conclusions will be of value to the further investigation of the effects of initial stress on the mechanical properties of CFST arch bridges.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第3期1-5,共5页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金(10272041
10502020)
关键词
初始应力
面内极限承载能力
钢管混凝土
拱桥
非线性
inltial stress
in-plane ultimate bearing capacity
CFST
arch bridges
nonlinearity
