Building connection structure and its design method

Abstract

To provide a building connection structure which is likely to reduce a distance between adjacent large-scale base-isolated buildings, and a design method of the same.SOLUTION: A building connection structure includes: a first building 10 having a first lower structure 11, a first base isolation layer 12 and a first upper structure 13 in this order; a second building 20 which has a second lower structure 21, a second base isolation layer 22 and a second upper structure 23 in this order, where a first longitudinal axis LA1 of the first upper structure 13 passing through a first center G1 of gravity of the first upper structure 13 crosses a second longitudinal axis LA2 of the second upper structure 23 passing through a second center G2 of gravity of the second upper structure 23, and does not pass through the second G2 of gravity; a rigid member 30 for connecting the end in a first longitudinal direction in a part on the lower end side of the first upper structure 13 and the end in a second transverse direction in a part on the lower end side of the second upper structure 23; and an attenuation member 40 for connecting the end in the first longitudinal direction in the part on the upper end side of the first upper structure 13 and the end in the second longitudinal direction in the part on the upper end side of the second upper structure 23 so that the part on the upper end side of the second upper structure 23 generates twisting due to earthquake force in the first longitudinal direction.SELECTED DRAWING: Figure 1B

Claims

1. A first building having a first substructure, a first seismic isolation layer, and a first superstructure in this order, A second building having a second substructure, a second seismic isolation layer, and a second superstructure in this order, wherein, in a top view, the first longitudinal axis of the first superstructure passing through the first center of gravity of the first superstructure intersects with the second longitudinal axis of the second superstructure passing through the second center of gravity of the second superstructure, and does not pass through the second center of gravity of the second building, A rigid member connecting the first longitudinal end of the lower end portion of the first superstructure and the second short end of the lower end portion of the second superstructure, The second superstructure has a damping member that connects the first longitudinal end of the upper end of the first superstructure to the second short end of the upper end of the second superstructure, such that the upper end of the second superstructure is subjected to torsion by the first longitudinal seismic force, A building connection structure that accommodates the aforementioned torsion.

2. A static stress analysis model creation step is performed by creating a frame stress analysis model by making the first superstructure and the second superstructure, and the first substructure and the second substructure into three-dimensional stereoscopic analysis models, A structural restoring force characteristic setting step involves performing a static elastoplastic incremental analysis using the aforementioned structural stress analysis model, and setting the restoring force characteristics for each floor of each building based on the load-deformation relationship obtained from the incremental analysis. A step to create a dynamic analysis model is performed in which, for each of the first superstructure and the second superstructure, and the first substructure and the second substructure, mass is concentrated as a point mass at the center of gravity of each floor, the points mass are arranged as spring elements having bending stiffness and shear stiffness according to the set restoring force characteristics, and seismic isolation devices are arranged between the superstructure and substructure as elements having predetermined stiffness and damping coefficients. A first torsion-responding step involves adding rotational inertia to each of the aforementioned mass points, adding torsional rigidity to each of the aforementioned spring elements between the aforementioned mass points, arranging the damping member as an element having predetermined rigidity and damping coefficient, and making a rigid connection between the damping member and each of the aforementioned mass points at the same level, The seismic wave generation step involves creating seismic waves that take into account the ground characteristics of the construction site, and A time history response analysis step is performed using the response analysis model created by the static stress analysis model creation step, the frame restoring force characteristic setting step, the dynamic analysis model creation step, and the first torsion response step, and the seismic wave analysis is performed to obtain at least the maximum response value of the story shear force from the analysis results obtained for each time point. A design seismic force setting step, which sets the design seismic force for structural stress analysis so that it is a value that encompasses the maximum response value of the story shear force, A method for designing a building connection structure according to claim 1, comprising: a second torsional response step of setting a design torsional moment for structural stress analysis to be input to the first superstructure and the second superstructure during an earthquake, based on the maximum damping force of the damping member.

3. A superstructure frame stress analysis step in which the frame stress analysis of the first superstructure and the second superstructure is performed taking into account the additional stress due to the seismic isolation device, based on the long-term load, the design seismic force, and the design torsional moment, A substructure structural stress analysis step in which the structural stress analysis of the first substructure and the second substructure is performed taking into account the additional stress due to the seismic isolation device, based on the loads from the first superstructure and the second superstructure and the design seismic force in the first substructure and the second substructure, The method according to claim 2, further comprising: an upper end connecting damping member examination step, which confirms the maximum response speed of the damping member and examines the mounting portion based on the stress analysis results of the upper structure frame stress analysis step and the lower structure frame stress analysis step.

4. A superstructure frame and substructure frame cross-section calculation step is performed, which calculates the cross-section based on the stress analysis results of the superstructure frame stress analysis step and the substructure frame stress analysis step, Based on the stress analysis results from the superstructure frame stress analysis step and the substructure frame stress analysis step, a seismic isolation support member examination step is performed to confirm the surface pressure and deformation amount of the support members of the seismic isolation device and to examine the mounting part. The method according to claim 3, further comprising: a seismic isolation layer damping member examination step, which confirms the maximum response speed of the seismic isolation layer damping member provided in the seismic isolation layer and examines the mounting portion based on the stress analysis results of the superstructure frame stress analysis step and the substructure frame stress analysis step.

5. The method according to claim 2, wherein the first torsional adjustment step is performed by adjusting the position of the seismic isolation device to match the actual arrangement and positioning the damping member in the actual location.

6. The method according to claim 2, wherein in the second torsional adjustment step, the design torsional moment is used as a couple input to the frame stress analysis model.

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