| CPC E04B 1/98 (2013.01) [E04B 2/74 (2013.01); E04H 9/021 (2013.01); E04C 2/30 (2013.01); E04C 2/44 (2013.01); E04H 9/022 (2013.01); E04H 9/028 (2013.01)] | 14 Claims |
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1. A method for design of a seismic-damping partition wall with variable-friction energy dissipation, wherein the seismic-damping partition wall comprises a peripheral frame and a single group of seismic-damping partition wall panels arranged in the peripheral frame, upper encased reinforcing boxes and lower encased reinforcing boxes are arranged at corners of a top end and a bottom end of the single group of seismic-damping partition wall panels, respectively, elastic members are arranged between the upper encased reinforcing boxes and the peripheral frame, partial backing plates are arranged at a bottom of the single group of seismic-damping partition wall panels and below the lower encased reinforcing boxes, the single group of seismic-damping partition wall panels comprises a plurality of partition wall panels, and anti-shear connecting members are arranged between adjacent partition wall panels; and the method comprises following steps:
step 1: building a bare frame structure model without considering lateral resisting stiffness of a partition wall, and calculating an inter-story shear force and an inter-story displacement of a structure under action of an earthquake;
step 2: according to the inter-story shear force and the inter-story displacement obtained in step 1, calculating an elastic strain energy We of the structure, and determining an expected additional damping ratio ξa0 provided by a seismic-damping partition wall in the structure for the structure;
step 3: according to a friction damping force-sliding displacement curve of the single group of seismic-damping partition wall panels, establishing a relational expression between a total friction hysteretic energy Wd of the seismic-damping partition wall in the structure and a first friction damping force FHu1, a second friction damping force FHu2 and a target sliding displacement ΔH of the single group of seismic-damping partition wall panels, and calculating the total friction hysteretic energy Wd:
 where Wd,i is a total friction hysteretic energy of all the single groups of seismic-damping partition wall panels of an ith story of the structure; n is a number of seismic-damping partition walls or seismic-damping partition wall groups of the ith story: ΔH,i is a target sliding displacement of a single group of seismic-damping partition wall panels of the 4 th story: FH0,i is a total sliding occurrence force of all the single groups of seismic-damping partition wall panels of the ith story; FH0 is a sliding occurrence force of a single group of seismic-damping partition wall panels of the ith story, calculated according to a sliding friction coefficient and a gravity of the single group of seismic-damping partition wall panels; FHu1,i is a sum of first friction damping forces of all the single groups of seismic-damping partition wall panels of the ith story; FHu1 is a first friction damping force of a corresponding single group of seismic-damping partition wall panels; FHu2,i is a sum of second friction damping forces of all the single groups of seismic-damping partition wall panels of the ith story; and FHu2 is a second friction damping force of a corresponding single group of seismic-damping partition wall panels;
wherein abscissas of the friction damping force-sliding displacement curve of the single group of seismic-damping partition wall panels represent a sliding displacement Δw of the single group of seismic-damping partition wall panels, ordinates represent a friction damping force FH of the single group of seismic-damping partition wall panels, and the friction damping force-sliding displacement curve of the single group of seismic-damping partition wall panels is determined by means of a plurality of feature points in end-to-end connection closure on the friction damping force-sliding displacement curve of the single group of seismic-damping partition wall panels;
wherein a number of the feature points is 7, and the 7 feature points are defined as point 0 and point a to point f; the point 0 is coordinate point 0; the point a is a feature point when the single group of seismic-damping partition wall panels slides just after overcoming a maximum static friction, and corresponding coordinates are (0, FH0), where FH0 is a sliding occurrence force of the single group of seismic-damping partition wall panels; point b is a feature point where the single group of seismic-damping partition wall panels slides from the point a to a positive target sliding displacement ΔH, and corresponding coordinates are (ΔH, FHu1), where FHu1 is a friction damping force of the single group of seismic-damping partition wall panels in this state; point c is a feature point where the single group of seismic-damping partition wall panels just changes when sliding back from a positive target sliding displacement ΔH point to the point 0, and at this moment, it is considered that a sliding displacement of the partition wall remains unchanged, i.e., Δw=ΔH, but a direction and a magnitude of the friction damping force change, and corresponding coordinates are (ΔH, −FHu2), where −FHu2 is a friction damping force of the single group of seismic-damping partition wall panels in this state; point d is a feature point where the single group of seismic-damping partition wall panels slides back from the point c to the point 0, and corresponding coordinates are (0, −FH0), where −FH0 is a friction damping force of the single group of seismic-damping partition wall panels in this state; point e is a feature point where the single group of seismic-damping partition wall panels slides from the point d to a negative target sliding displacement −ΔH, and corresponding coordinates are (group −ΔH, −FHu1), where −FHu1 is a friction damping force of the single of seismic-damping partition wall panels in this state; the point f is a feature point where the single group of seismic-damping partition wall panels just changes when sliding back from a negative target sliding displacement −ΔH point to the point 0, and corresponding coordinates are (−ΔH, FHu2), where FHu2 is a friction damping force of the single group of seismic-damping partition wall panels in this state
step 4: solving a calculated additional damping ratio ξa provided by the seismic-damping partition wall for the structure, and subjecting the calculated additional damping ratio ξa and the expected additional damping ratio ξa0 to simultaneous comparison; if an expected design target is satisfied, i.e., ξa≥ξa0, determining the first friction damping force FHu1 and the second friction damping force FHu2 of the single group of seismic-damping partition wall panels; otherwise, continuing to adjust until the expected design target is satisfied, wherein a formula for the calculated additional damping ratio ξa is:
 step 5: according to vertical compression requirements and elastic deformation requirements of the elastic members in the single group of seismic-damping partition wall panels, designing construction of the elastic members, wherein an actual vertical stiffness design value KB,d and an elastic deformation requirement Δy of the elastic members need to simultaneously satisfy following formulas:
 where γ is a design tolerance; KB is a theoretical required vertical stiffness value of the elastic members; FB is a vertical compression of the elastic members against the seismic-damping partition wall; φ is an inter-story displacement ratio of the peripheral frame where the single group of seismic-damping partition wall panels is located; LB is a vertical distance from a down-press point of the elastic members to a central line of a column section; and λ is a coefficient of variation between a rigid body frame deformation mechanism and an actual frame deformation mechanism;
step 6: according to the first friction damping force FHu1 of the single group of seismic-damping partition wall panels, calculating an anti-shear bearing force Vs at a connection between the anti-shear connecting members, and designing a form and construction of connection between the anti-shear connecting members;
step 7: performing damage control check on concrete wall panels near the lower encased reinforcing boxes of the single group of seismic-damping partition wall panels; and
step 8: completing the design of the seismic-damping partition wall with variable-friction energy dissipation.
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