The Through Arch Bridge Structure Optimization And Dynamic Characteristics Analysis Based On APDL

The arch bridge has a long history in China. The arch bridge, by virtue of its excellent structural performance, capacity to span long distances, and convenience in regards to construction has been one of the most frequently used bridge constructions in China. The through arch bridge later developed from the traditional arch bridge. It has an arch rib, wind bracing, booms, a deck beam, and deck plate which all collaborate to form a stable bridge. In recent decades of development, hundreds of through arch bridges have been built; the largest spans 280 m. These bridges are an important part of highway transportation.As bridge structure engineering is constantly innovating, allowing bridges to stretch over even longer distances, it is difficult for the traditional arch bridge design method to satisfy modern needs. Today, optimal designs are determined by the analysis software ANSYS, a parametric design script language. This intelligent analysis method can effectively complete structure optimization and “grid adaptive finite element analysis” is becoming more and more important. With APDL(ANSYS Parametric Design Language), even with complex data, the user can fully control the actual attributes and data analysis. This contrasts with traditional finite element analysis because it has a larger capacity, especially in the optimization level. With the number of bridges increasing and bridge earthquake disasters occurring more frequently, designers of all countries in the world attach great importance to the bridge’s seismic dynamic response. Thus, only approaching bridge design from a structural perspective causes a certain one-sidedness. Examining the dynamic characteristics of the structure must have a certain amount of guiding significance.In view of the above situation, this thesis will elaborate on the engineering background of the through arch bridge, the establishment of the space finite element model through the finite element analysis software ANSYS parametric design language(APDL), and discuss the effect of force and displacement on the structure within the constraints of size optimization,internal stress, and structure comparison feasibility in the before and after optimization. At the same time, this thesis will compare the model dynamic response analysis, the introduction of seismic response spectrum, in terms of before and after optimization for seismic response spectrum changes. Additional discussion will center on seismic wave transient analysis and the before and after response curves for the derived model changes. After comprehensive comparison, reflect the reliability of the optimization structure model.