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INESTABILIDAD DE ARCOS SEGMENTADOS DE CONCRETO ARMADO / INSTABILIDADE DE ARCOS SEGMENTADOS DE CONCRETO ARMADO / INSTABILITY OF SEGMENTAL REINFORCED CONCRETE ARCHS
HUMBERTO CORREIA LIMA JUNIOR
DATA DE PUBLICAÇÃO
Segmental arch is a structure made of several straight segments of precast concrete connected at points belonging to a curve in the form of an arch which circumscribes the structure. This type of arch has some advantages for the precasting industry: a) it allows the use of the same forms used to cast other types of straight pieces such as beams and columns; b) it allows the construction of arches with any height/span ratio, using the same forms, which is achieved just by varying the angle between the connected segments. In this work, a study of the stability of this type of arch is developed, with the use of a computer model based on the finite elements method. In side of this study, the effects of height/span ratio variation, segment number variation, initial imperfections presence and the wind action are investigated. In addition, a calculus procedure of the critical load to the segmental arches is developed. This procedure takes in consideration the loads characterized by limit points as much as that by bifurcation points. Is also presented an experimental test, of a segmental arch made of reinforced concrete, that was conducted with the purpose of studying the global behavior of this type of structure, and verify the efficiency of the computer model used.