This article mainly introduced some problems of PKPM software that should be considered in building structure design,including determining reasonably the horizontal load,assumed slab rigidity,rigidity amplification coefficient of central beam,the moment modulation coefficient of the beam s end,and then elaborated the above problems to ensure the validity and reliability of the results.

The following paper introduces some problems should be noticed in the utilization of PKPM series software as rational assumption of slab rigidity,rational selection of simulation construction mode and definition of shortpier shear wall structure,and analyzes these problems in detail,in order to increase design computational efficiency and to ensure accuracy and reliability of calculation result.

The effect and tactics of story-height sudden change to story rigidity of high-rise building;

In order to study influence on response of mega steel-frame structures from floor stiffness an.

On the basis of these, the paper studies profoundly the influence on response, seismic design method and seismic behavior of the mega steel structures from the floor stiffness and hypo-frame.

Aiming at this important theoretical and engineering issue, this paper investigates the influence of floor stiffness on the seismic demands and seismic performance of building structures, based on a 20-stories steel benchmark high-rise building, through the static elasto-plastic analysis (pushover) and Incremental Dynamic Analysis (IDA).