不均等な階高と質量分布を持つ鋼構造骨組の確率論的COF評価

概要

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In the seismic design concept, the frame structures are usually designed with a column over design factor (COF) to ensure yielding of all the beams in flexure prior to possible yielding of columns, which is generally considered to be preferable failure mode. In the present study, the COF requirements of the frame structures with height and mass irregularity are investigated probabilistically by applying first order reliability method (FORM). The Ai distribution of load along the height of the frame is taken into account. Three different cases are considered; case I: considering only the height irregularity, case 2: considering only the mass irregularity, case 3: combining both the height and mass irregularity in the same frame. It is observed that COF requirement increases with the increase of height and mass irregularity and it further increases when both the height and mass irregularity is combined in the same frame. The study has been conducted in different reliability levels and the corresponding COF values have been presented in the paper.
一般社団法人日本建築学会の論文
2011-03-25