| The slabs and beams of RC frame structure are casted as a whole and work collaboratively under horizontal load. The study found that the slab significantly influences the mechanical behavior and the deformation properties of the frame beams,thus the current specification of "strong column weak beam" design criteria is difficult to achieve. Most related researches are setting foot on the frame beams internal force, rather than the work mechanism of the slab itself and the structural performance effection of the slab and its surrounding members. The force transmission mechanism analysis of the slab, and its affection to the performance of RC frame structure has a significant application value on identifying the destruction mechanism of frame structure under horizontal seismic action and the seismic design criteria.This paper designs different models of different slab thickness, beams and columns sections, slab spans, storey heights according the internal force calculation method of frame structure, then analysis the following questions based on the finite element software ABAQUS. First, the effect of RC frame member stiffness to the distribution of the slab stress and internal force, and to the slab deformation in the elastic and inelastic stage. Second, as the effective flange width can be considered to measuring the frame flexural bearing capacity, this paper researches on the slab rebar stress in the negative moment region of the frames which have different nodes form,lateral deformation, member geometric parameters and slab spans, and get an effective flange width empirical formula. Third, this paper studies preliminarily the framework of effective flange width design improvement methods, by adjusting the cross section of the column or column ’ s reinforcement, and placing the beam ’ s section rebar within a certain range of the width of the slab, could achieve the design criteria of "strong column weak beam". |
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