Nonlinear Static Analysis of Connecting Twin-towers High Structure Based on MIDAS

摘要

To propose a unified seismic verification method considering both local buckling and low cycle fatigue, inelastic be havier of box-shaped steel pier columns in steel bridge structures are investigated experimentally and analytically under monotonic and cyclic loadings. Six unstiffened box-section column specimens with various dimensional and loading parameters are subjected to monotonic and cyclic lateral loading combined with or without constant axial force. Numerical analyses based on shell and fiber beam elements are employed to take into account the effect of lo cal buckling and ductile crack initiation. Based on these investigations, a seismic verification method for thin- and thick-walled steel structures is proposed considering local buckling and low cycle fatigue. Strain-based capacity limit values are afforded as failure criterion to evaluate the points when local buckling and ductile crack initiation occur. Comparisons between experimental and analytical results show good prediction in the current proposal.