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Finite Element Analysis of Yield Mechanism of Cave-Cutting around RC Frame Joint for “Strong Column and Weak Beam”

Under the influence of floor, the reinforced concrete frames have never realized the yield mechanism of strong column and weak beam which is a seismic design principle. To study the influence of realizing such yield mechanism because of floor with opening, its necessary to establish two frame models that one is with common floor and the other is floor with opening around the joints whose size is 600mm×600mm by the ANSYS that is finite element software. Moreover, these models apply the seismic loads and carry out the time history analysis. The results show that the frames stiffness has been weakened after the floor is opened, the peak acceleration reduced and the displacement increased. However, the ductility has been strengthened, which slightly reduce the reaction of the acceleration and displacement. In addition, the appearance of the plastic hinges in the beam are advanced, and the development of their plastic deformation becomes quicker than those of columns, and the plastic hinges in the bottom of the column are delayed. Therefore, the measure of opening the floor can realize the ideal yield mechanism of strong column and weak beam to reach the seismic target that the building cant collapse under the strong shocking.