| The calculation of story shear capacity of building structure in the standard for seismic appraisal of buildings has two problems. First, the reinforced concrete bracings, steel columns and steel bracings are not taken into account. Second, the calculation does not adequately consider the difference of member ductility. To address the problems, the paper considered all the basic lateral force resisting members, including reinforced concrete columns, reinforced concrete shear walls, reinforced concrete bracings, steel columns and steel bracings, and considered the difference of member ductility at the same time, exploring a new way to calculate the story shear capacity of building structure in the case of rigid floor assumption to make the calculation formula more perfect.With the nonlinear finite element software ABAQUS, the paper set up a large number of models of different basic lateral force resisting members, including reinforced concrete columns, reinforced concrete shear walls, reinforced concrete bracings, steel columns and steel bracings, with different cross-section heights, longitudinal reinforcement ratios, axial compression ratios, and upper ends of constraints, and used the method of monotonic loading to get their load- displacement curve. The paper studied the shear capacity and ductility of these basic lateral force resisting members, then got the actual load- displacement curve of the floor by the superposition of these curves, in order to consider the difference of member ductility, and to determine the relevant parameters of the new calculation formula.Finally, the paper got the new calculation formulas considered the difference of member ductility by superimposing the member curves in turn and directly, and checked the new calculation formulas through member curves superimposed. |
