Study on regularity indexes of single-span frame structure layout considering plane bending deformation
The period ratio and torsional displacement ratio are commonly used control indexes in seismic design of multi-story and high-rise structures,which cannot reflect the regularity of the layout of long-span structures and the deformation and internal force characteristics under earthquake excitations.Taking the single-span frame structure as the main research object,considering its characteristics of small panel stiffness,and according to the essential purpose of controlling the regularity requirement of plane layout(controlling the uniformity of lateral movement of lateral force resistant members),two new indexes were proposed to judge the regularity of plane layout,namely generalized torsional displacement ratio and shear stiffness matching index.The change law of the two indexes under various parameters was discussed,the function relationship of the two indexes was established,and the regularity limit of the plane layout of long-span structures was defined based on generalized torsional displacement ratio.The results show that the generalized torsional displacement can more reasonably characterize the response characteristics of single-span frame structures under earthquake excitation than generalized torsional displacement ratio and the shear stiffness matching index.According to the above two new indicators,the regularity of plane layout of bent structure depends not only on the layout and mass distribution of lateral force resistant members,but also on the panel stiffness and plane bending deformation.
bent structurestructure regularitygeneralized torsional displacement ratioshear stiffness matching index
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