THE ASSESSMENT OF BEHAVIOR OF CONCRETE ARCH SHELLS UNDER UNIFORM DISTRIBUTED LOADS

Arch shells have vast application in Some grounds such as: civil engineering, mechanic and in building bridges, tanks, cover of large spaces, industrial storages, construction and etc. One of reasons to mention for deployment and using of these structures is its economical design in light of materials and costs. In case of arch shells, there are some studies, under aerial loads [1], wind, and dynamic [2], but in this paper, two kinds of circular and original Iranian section under distributed symmetrical loading effect and partly loading are discussed and their results are compared and evaluated. In this way, changes of height, Length span and Kind of loading are studied and resistance parameters of this model are studied. These models for 3 spans with different (12) heights are sealed under spread loading [complete, 25 %, half and 3/4 of length cover with step - by-step loading] and are analyzed in nonlinear by Lusas software. Resistance parameters, in this study, resistance criterion, bearing potential and plasticity of structures. For this purpose, deformation-load diagram, in point of maximum displacement which was occurred, is drawn and resistance criteria of most load, which structure can bear before breakdown space under the diagram and most placemat which can be resulted from this diagram (respectively) are selected.