Abstract:Seismic shear force response of super high-rise structures, calculated by the mode-superposition response spectrum method, cannot meet the requirements of the minimum shear force coefficient in code. Therefore, the concept and adjustment method of minimum shear force coefficient were sketched in this paper. Two models with different shear force coefficients were then adopted to analyze their differences in structural elasticity and elasto-plastic seismic response, and discuss the influence of shear coefficient on the seismic response of super-tall buildings. Finally, the minimum shear force coefficient of the two models was adjusted to satisfy code requirements through strength and stiffness adjustment methods; rationality of the structural response induced by different methods was then analyzed. Results demonstrated that, compared with the structure without a specified minimum shear force coefficient, the elastic base shear force of the structure with a specified minimum shear force coefficient was larger, and story drift ratio and elasto-plastic displacement responses were smaller, i.e., the safety of the structures was enhanced. The elastic overturning moment demand and elasto-plastic base shear values of the two models, adjusted by the stiffness adjustment method, were greater than those adjusted by the strength adjustment method. Using the two methods, the maximum vertex displacement and story drift ratio were similar, although there was an abnormal situation wherein the story drift ratio changed with stiffness. In terms of meeting seismic requirements, stress condition of the components was superior and the component cross-section more reasonable and economical by using the strength adjustment method.
