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根据弹性中心法,得到由拱脚沉陷引起的两端固支圆拱的附加内力,并通过能量法建立了基于拱脚沉陷的平衡方程和平衡稳定性方程,分析了拱脚沉陷对拱的屈曲性能的影响.研究表明:1)拱脚沉陷将导致拱极限屈曲荷载显著减小;2)不同的深坦度下,拱脚沉陷对拱极限屈曲荷载的影响不同,拱越坦,其影响越明显;3)拱的长细比越小,拱脚沉陷对极限屈曲荷载的影响越明显;4)拱脚沉陷将改变拱屈曲方式的拱型几何参数分界值,拱的对称极值点屈曲的范围将随着拱脚沉陷的增加而扩大.
Based on the elastic center method, the additional internal forces of the two-end fixed-round arches caused by the settlement of the arches are obtained. Based on the energy method, the equilibrium equation and the equilibrium stability equation of the arched-foot settlement are established. The results show that: 1) the settlement of arch foot will lead to a significant decrease in the ultimate buckling load of the arch; 2) under different depths, the influence of the arch foot settlement on the arch ultimate buckling load is different, Obviously; 3) the smaller the slenderness ratio of the arch is, the more obvious the influence of the arch-foot subsidence on the ultimate buckling load; 4) The settlement of the arch foot will change the arching geometrical parameter boundary value of arch buckling mode, Range will increase with the settlement of the arch feet.