| As the adjustment of earthquake-shearing-force in the Mega Frame-Core Wall Structure is not specially specified by Chinese code, engineers tend to design by refering to specifications of Frame-Core Wall Structure. This paper aims to study the shear force distribution characteristics of Mega Frame-Core Wall Structure, and puts forward suggestions on the adjustment of earthquake-shearing-force in the Mega Frame-Core Wall Structure.By building plane and space finite element models, the shear force distribution characteristics of Mega Frame-Core Wall Structure under horizontal static loads was analyzed, and differences in distribution characteristics between frame-core wall structure and mega frame-core wall structure were discussed. The shear force distribution characteristics of Mega Frame-Core Wall Structure under dynamic earthquakes was analyzed in detail, after inelastic time-history analysis of series of models, which were all designed to be built on the ground of 7 degree earthquake intensity. Influences of belt trusses’ quantity, whether set outriggers or not on the shear force distribution characteristics of Mega Frame-Core Wall Structure were also analyzed. Based on all the distribution characteristics, suggestions on how to redistribute the shear force in Mega Frame-Core Wall Structure were proposed.Major conclusions were as follows:(1)When earthquake comes, the shear force distribution characteristics of Mega Frame-Core Wall Structure is obviously different from Frame-Core Wall Structure. In Mega Frame-Core Wall Structure, shear force proportion of the frame in low stories is higher than its proportion in Frame-Core Wall Structure. It is showed that the maximum shear force of the frame in Mega Frame-Core Wall Structure is at the bottom of the structure, when ignoring the shear mutation in strengthened stories, and the shear force decreases with the increase of storey number.( 2) In Mega Frame-Core Wall Structure, the shear force distribution characteristics of mega columns is different from the secondary columns. When ignoring the shear mutation in strengthened stories, the shear force of the mega columns decreases with the increase of storey number, while shear force of the secondary columns increases first and then decreases, and the shear force in the bottom storey remains near 0. In most stories, the shear force of secondary columns is bigger, even 5 times bigger, than the shear force of mega columns.(3)The belt truss quantity as well as whether set outriggers or not has little influence on the shear force distribution characteristics of Mega Frame-Core Wall Structure.(4)It is suggested that the specifications of the frame stiffness should be relaxed, and that shear force in the bottom of the structure should be modified separately. Further more, shear force of the mega columns and the secondary columns should be modified separately, and ductility capacity of vertical members in all the control floors should be ensured. |
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