Abstract
To make clear the elasto-plastic bending deformation of wide flange beam-columns under constant axial compression, an analytical metheod is presented here under the consideration of strain hardening effect as bilinear-type shown in Fig. 4. At first the relationships between bendingmoment and curvature are shown in Figs. 9, 10, 11 under several simplified models of wide flange cross section as shown in Fig. 5. Then an analytical method for calculation of deflections by numerical integration is developed and compared with experimental results (Figs. 13, 14, 15). From the comparison of these results it is recognized that the influences of strain hardening index μ_<stb> upon moment-curvaturerelation are remarkable and in this case for ordinary structural steel SS 41. SM 55. SM 50 Y in JIS μ_<stb>=0.01 is assumed. For simplifying the analysis the 4-Point-Model shows fairly good agreement with the behaviors of wide flange cross section. The differences between models and real cross section becomes larger under lower axial compression ratio N/N_y. It becomes possible to develop the elasto-plastic deformation analysis of wide flange beam-columns under cyclic repeated loading from these research results.
