Dynamic Stability Research Of Arch Under Radial Uniform Cyclic Loading

As a kind of beautiful and practical structure, arch structure, from ancient zhaozhou bridge to modern chongqing ChaoTianMen Yangtze river bridge, has been widely used。It has a broad application background.At present, many scholars mainly study the static stability instead, the dynamic properties of arch structure is relatively small.On the basis of previous research, this paper focuses on the radial uniform cycle load under the action of dynamic stability of the arch structure.The main research work:l.From the theory, deducing dynamic critical frequency expressions of two hinged arch under radial uniform cycle load, solving the dynamic unstable region.2.ANSYS for round two hinged arch transient dynamic analysis, harmonic response analysis and dynamic stability analysis, get the corresponding results of the analysis.3.Regarding forced vibration, resonance and parameter resonance, three kinds of parametric resonance frequency, as excitation frequency, using the transient dynamic analysis of arch structure dynamic instability of excitation frequency. When the excitation parameter resonance of the structure, the structural dynamical instability caused, similar to the theoretical value is derived.4.In harmonic response analysis, analysis of hinged arch and arch clamped in dynamic instability of the excitation frequency and the dynamic instability region, the analysis is helpful to better understand the influence degree of the unstable boundary conditions on the dynamic performance.5.In dynamic stability analysis, comparison and analysis of arch structure under the excitation parameter resonance frequency dynamic stability and static stability performance; Comparative analysis of different boundary conditions unstable arch structure dynamic performance.6.Through analysis, the theoretical formula is derived and the finite element software analysis results were similar, arch structure under excitation parameter resonance occur when the instability, and hinge dynamic stability of the arch compared with the fixed supported arch, recessive protruding obvious.31pictures,11forms,52references.