In-Plane Nonlinear Stability Analysis Of Two Hinged Parabolic Steel Arches

Arch is a form of long-span structure, which has more extensive use. The characteristics of arch in the force is press, so It is very important to analyze the characteristics of stability in design of the arches. The thesis studied the stability behavior of the steel arch.The stability of the arch can be analyzed by load-displacement post buckling curve. Structure's load-displacement curve can display the whole stages of the strength stiffness and stability clearly. We can research other factors (such as initial shortage and span) having the influence on actual arch's stability through the load-displacement curve.The paper models and geometrically nonlinear analysis the steel arch and trussed arched by ANSYS...a large-scale current finite element analytical program. The figures of inner and displacements are given. The unstable state and the stability of the arch has been fully researched by analyzing the load-displacement curve. Many stable factors having influence on the arch have been analyzed and concluded. Several main stable factors which have influence on arch have been pointed.The thesis studied further the ultimate strengths of axially loaded pinned arches, considering the effects of span, ratio of high and span, initial crookedness, material nonlinear and sectional size. Stability factors for axially loaded pinned arches are provided. It is found that the relationship between the arch stability coefficient and the arch normalized slenderness ratio is established.