Dynamic properties of double-segment rocking wall-frame structure
For the high-rise rocking wall-frame structure,the rocking wall can be segmented and hinged to reduce its stiffness and internal force requirements.To study the dynamic properties of the double-segment rocking wall-frame structure and explore the reasonable segmentation position of the rocking wall,the equivalent dynamic equations of the single and double-segment rocking wall-frame structures were established based on the bending beam-shear mass model.On this basis,the influence of the segmentation position of the rocking wall on the structural period,vibration mode and bottom shear force was compared and analyzed.The finite element case study was carried out to verify the rationality of the theoretical analysis.It was found that the bending beam-shear mass model could reasonably reflect the dynamic performance of the whole structure under the condition of adjusting the segment position of the rocking wall.When the segment section was located in the middle and lower part of the structure,the second-order modal contribution of the structure was significant.Affected by this,the structural period was increased compared with the single-segment rocking wall-frame,and the base shear force of the structure decreased.On the contrary,when the segment position was located in the middle and upper part of the structure,the structural deformation was dominated by the first-order mode,and the base shear force was higher than that of the single-segment rocking wall-frame.
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