Finite Element Nonlinear Analysis of Stressed Arch Frames

摘要

The report describes a nonlinear analysis which can be applied to study the strength and behavior of stressed arch (STRARCH) frames. The unique feature of the structural system is the way the arches are erected without the use of cranes or scaffolding but by the use of a post-tensioning process. For some highly curved structures, the top chord may be plastically deformed during the erection procedure. The finite element nonlinear analysis has been developed to simulate the geometric nonlinear behavior and plasticity in the stressed arch, particularly the top chord. The report describes the nonlinear analysis including the arch elements used, the implementation of plasticity and the iterative strategies employed to solve the nonlinear problem, particularly in the post-ultimate range where snap-through may occur. A series of tests on panels removed from the stressed arch frames, which have been described in earlier papers and reports, are simulated using the nonlinear analysis to verify its accuracy for application to stressed arch frames.