A Comparison Study of Steel Structures Design Method Based on Chinese and Japanese Building Codes

Abstract eng:
In both Chinese and Japanese building codes, a two-stage design philosophy, damage limitation (small earthquake) and life safety (extreme large earthquake), is adopted. The two building codes use different design methods to achieve same performance target. Japanese code adopts the allowable stress design method, while Chinese code uses the probabilistic limit state design method. In this paper, the target buildings are limited to small or moderate height, less than 60m for easy understanding. The design load combinations and material strength are compared first in the small earthquake. Load value and steel material’s strength are compared at the condition where the dead load, live load and seismic load are assumed as same. Although the two codes use totally different design method, the ratio between design strength with load value diffs few. The design formulas to calculated stress of structural members under axial load, shear load, bending moment and the mixes are compared then. The formulas are almost same, except in Chinese code a ductility factor is introduced to give smaller stress. The stability of column is checked separately in Chinese code, while the stability is considered by decreasing the design strength in Japanese code. A column and a beam are selected from a steel moment-resisting frame designed according Japanese code, to demonstrate the design process. The load condition and stress results are checked step by step to be understood clearly.

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