Abstract
For the analysis on elasto-plastic behavior of steel structures with large deformation and instability, the effect of strain-hardening should be considered in. In this case, detailed numerical method based on one-dimensional finite element method is established, but requires laborious calculations. Therefore, plastic hinge method is effective to an analysis of complex frames for the powerful tool. K. Inoue and K. Ogawa extended to the generalized hinge method to include the effect of strain-hardening on kinematic hardening rule, showed the generalized hardening hinge method that the value of the strain-hardening factor is 0.02 for beams and columns, and 0.01 for bracing members. But, this method is not satisfactory for the analysis of space frames since literature dealing with the elastic behavior of space frames and strain-hardening factor is unknown. In this paper, based on the approach subjected by P. G. Hodge we extended the generalized hardening hinge method to include the difference of strain-hardening factor in each of the generalized stress-directions. As numerical examples, a bracing member, laterally loaded beam-column and L-shaped frames subjected to horizontal load under constant vertical load are treated, and these numerical results are in good accordance with experimental results or numerical results by column deflection curve method.
