Aiming at the problem of the standard calculation length method not being able to consider interaction between a frame and a shear wall, mutual support between columns of the same layer and insufficient support function between layers, an analytical algorithm for calculating critical bearing force of a frame-shear wall structure was proposed. The mechanical model of "three springs-sway column" was taken as the basic element to calculate the stable bearing capacity of a single frame column. Then, basic units including stiffness and load were assembled within each floor, and then the stiffness and load of each story were assembled between floors. Solving critical bearing capacity was converted into solving the floor lateral stiffness of the structure. A simple and practical calculation formula for directly calculating critical bearing capacity of a frame-shear wall with lateral displacement was derived. It was shown that the formula can consider the three mutual supports including mutual support between the same layer’s columns, that between floors, and support from shear wall to frame to effectively makes up for the deficiency that the code can’t solve the critical bearing capacity of a frame-shear wall. Example calculation results showed that the proposed method has good accuracy and correctness for being applied in engineering design.
Key words
frame-shear wall /
internal stiffness /
external stiffness /
critical internal and external stiffness ratio coefficient /
critical factor /
critical force
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