Abstract：The characteristic parameters of bending stiffness ratio i, shearing stiffness ratio g of outrigger trusses and bending stiffness ratio p of column were investigated in order to get the simplified calculation formula of structural roof displacement in frame-core structure with outriggers. The relationships among the structural roof displacement, internal forces and i, g, p under uniformly distributed loading and earthquake loading were studied through a 253.2-meter super-rise building using the software ETABS. The results show that i, g, p adopted for optimizing the structural lateral stiffness are reasonable and feasible, and p has the greatest influence on the structural lateral stiffness while the second is g and i has the smallest effect. As for the characteristic parameters, i should not be bigger than 0.6, g should be 0.9～3.5, and p should be 1.3～4.6.
2013, Vol. 32 
