摘要:
An elasto-plastic damper is adapted to be used in a structure, such as a building and other facilities, for absorbing vibration energy created by earthquake tremors and other ground vibrations. The damper is a centrally bulged and generally cone-shaped hollow body of revolution so that its section modulus changes substantially porportional to a bending moment created in the damper body due to horizontal stresses, thus permitting a maximum degree of deformability. This elasto-plastic damper is compact in size and demonstrates a high degree of vibrational energy absorbability.
摘要:
A positive vibration suppression apparatus is disclosed, which suppresses vibrations of a building caused by earthquakes or winds by applying a control force to the building. The apparatus comprises a weight provided on the top of the building in a suspended form to reduce friction and an actuator provided between the weight and the building. The vibration suppression apparatus is controlled through sensing of the vibrations of the building and weight by a sensor, whereas for excessive vibrations of the building the vibrations of the weight are made close to the vibrations of the building to protect the apparatus, because the capacity of the vibration suppression apparatus is limited. Further, in an oil hydraulic system for obtaining a great control force, small and large size oil hydraulic pumps connected to respective small and large size electric motors and an accumulator are provided in parallel, so that the apparatus is warmed up at all time for oil hydraulic control with low power consumption. Two or more vibration suppression apparatuses are controlled at the same time according to the shape of the building to cope with torsional and secondary vibration components.
摘要:
A hydraulic cylinder type high damping device in which a cylinder member or a piston rod member is connected to the frame of a structure and the other member is connected to an earthquake-resisting element integrally secured to the frame. A plurality of passages through the piston connect hydraulic chambers on opposite sides of the piston. The passages are provided with pressure-governing valves which control the flow of oil between the hydraulic chambers. In addition, an accumulator system provides a bypass for oil to flow between the hydraulic cylinders in order to modulate the oil pressure in the damping device. Relief valves are provided in parallel with the pressure governing valves to provide a variable damping coefficient which protects the damping device from overloads caused by excessive seismic shock.
摘要:
An elasto-plastic damper is disclosed which comprises either a metal block-like or a metal plate-like damper body, each having a plurality of spaced apart openings extending therethrough to provide elastic deformability to the damper body. The elasto-plastic damper is adapted to connect bifurcated axially aligned structural members in a building. When an earthquake tremor impacts upon the building, the vibrational energy transmitted to the bifurcated axially aligned structural members is attenuated by the interconnecting elasto-plastic dampers.
摘要:
A high damping device combined with the frame of a building to protect the building from seismic shock. For seismic vibration up to a predetermined level corresponding to the permissible strength of the high damping device, a damping coefficient c of the high damping device is set so as to be c.sub.3 =c=c.sub.1 with respect to a damping coefficient c.sub.3 for giving the maximum value of a damping factor h.sub.3 corresponding to a tertiary mode of vibration of the structure and a damping coefficient c.sub.1 for giving the maximum value of a damping factor h.sub.1 corresponding to a primary mode of vibration. The maximum load on the high damping device is predetermined and means are provided to prevent the high damping device from being damaged in the event that the predetermined maximum load is exceeded. The inventive combination permits the stiffness factor of the building to be reduced from a factor of 1.0 down to a factor as low as 0.3, with a proportionate reduction in steel frame mass.
摘要:
A rigidity control device is provided to change the natural resonance of an entire building by varying the rigidity of selected structural members such as pillars, beams, braces or floor and pillar, wall and pillar or beam connection members, joints and the like. The rigidity of a structural member is controlled by restraining or releasing a member from restraint or by applying a controlled force to the member. These processes are selectively combined so that the rigidity of the whole building and each section thereof is controlled by a computer according to earthquake forecast analysis. Thus, the proper rigidity of a building is determined and provided responsive to earthquake detection to prevent the building from destructive resonance caused by earthquake tremors.
摘要:
An extra super multi-story building having one piece of extra super multi-story of about 200 story construction, two pieces of extra super multi-stories of about 150 story construction and one piece of extra super multi-story of about 100 story construction. Each extra super multi-story includes two through four pieces of tower-like super multi-stories of about 50 story construction and of about 50 m in diameter (floor area: about 200 m.sup.2 /story). A sky lobby is provided about every 50 stories connecting the extra super multi-stories. Four shuttle elevators lead from the ground to the sky lobbies, and a sightseeing tower and high-rise garden (sky dome) are provided at the rooftop of the extra super multi-story building. Main facilities such as offices, hotels and residences are arranged in each extra multi-story. In addition, in order to be able to construct the extra super multi-story building, the individual extra super multi-story buildings are monolithically connected with one another by girders every several ten stories, and a space truss is constructed on the outside of each extra super multi-story building.
摘要:
A method of controlling a building against an earthquake according to the present invention comprises the steps of analyzing instantly the earthquake on the basis of data observed by earthquake sensors disposed in the building and narrow and wide regions, varying the connecting conditions in the building on the basis of obtained earthquake response forecast to vary the rigidity of the building or giving counter force to a building with an exciter to control oscillation according to individual earthquake characteristics.
摘要:
A rigidity control device is provided to change the natural resonance of an entire building by varying the rigidity of selected structural members such as pillars, beams, braces or floor and pillar, wall and pillar or beam connection members, joints, and the like. The rigidity of a structural member is controlled by restraining or releasing a member from restraint or by applying a controlled force to the member. These processes are selectively combined so that the rigidity of the whole building and each section thereof is controlled by a computer according to earthquake forecast analysis. Thus, the proper rigidity of a building is determined and provided responsive to earthquake detection to prevent the building from destructive resonance caused by earthquake tremors.
摘要:
A hydraulically-operated piston device installed between the frame of a structure and a vibration-resisting element provided separately from the frame varies the rigidity of the frame by changing the condition of connection between the frame and the vibration-resisting element. A valve controls the operation of the piston device and can be adjusted to change the coefficient of damping of the piston device. To obtain maximum rigidity of the frame, the piston is hydraulically locked in place. For maximum flexiblity of the frame, the piston can be hydraulically released from a locked position to move freely. Hydraulic resistance to movement of the piston can be graduated by metering the flow of oil into and out of the piston device. The coefficient of damping is a function of the metered flow of hydraulic fluid in the piston device.