EP2475829B1 - Structural protection system for buildings - Google Patents

Structural protection system for buildings Download PDF

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Publication number
EP2475829B1
EP2475829B1 EP10747238.3A EP10747238A EP2475829B1 EP 2475829 B1 EP2475829 B1 EP 2475829B1 EP 10747238 A EP10747238 A EP 10747238A EP 2475829 B1 EP2475829 B1 EP 2475829B1
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EP
European Patent Office
Prior art keywords
bearing structure
building
energy dissipation
structural system
base
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EP10747238.3A
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German (de)
English (en)
French (fr)
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EP2475829A1 (en
Inventor
Alessandro Balducci
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E04H9/0235—Anti-seismic devices with hydraulic or pneumatic damping
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E04H9/0237—Structural braces with damping devices

Definitions

  • the present patent application for industrial invention relates to a structural system for seismic protection of buildings.
  • the structural system according to the invention is especially suitable for seismic protection of existing buildings, with special reference to buildings that play an important social role, classified as strategic buildings (hospitals, schools, barracks, etc.) and also of new buildings.
  • Fig. 1 illustrates a structural system for seismic protection of buildings according to the prior art.
  • a plurality of dissipation devices (1) are installed in building (E) to be protected, being designed to dissipate the energy generated by the oscillations of the building due to earth tremor. According to the different techniques, said dissipation devices (1) are installed inside the building (E) or outside it on the walls.
  • the building (E) comprises a framework of the bearing structure.
  • framework we mean a frame composed of multiple floors (S) and vertical elements (P), such as pillars or bearing walls, in order to generate a plurality of spaces (M).
  • At least one dissipation device (1) is installed in each space (M) of said framework, in bracing configuration, preferably with diagonal direction with respect to the space (M).
  • Each dissipation device comprises a dissipation means (1 c) disposed between two rigid rods.
  • a first end (1 a) of the first rod of the dissipation device is tied to a portion of angle between the lower floor (S) of the space and a first lateral wall of the building.
  • a second end (1 a) of the second rod of the dissipation device is tied to a portion of angle between the upper floor (S) of the space and a second intermediate wall of the building.
  • each dissipation device (1) works autonomously and contributes to compensate wall deformations of each space (M) of the framework.
  • JP 09 235890 (Kajima Corp.) discloses a reinforcement and vibration-damping structure for existing buildings. It discloses a structural protection system having the features of the preamble of claim 1.
  • the purpose of the present invention is to eliminate the drawbacks of the prior art by disclosing a structural system that is able to oppose the oscillations of buildings due to earth tremor in an efficient and efficacious way.
  • Another purpose of the present invention is to provide such a structural system for seismic protection of buildings that is versatile and at the same time easy to make, install and maintain.
  • the building to be seismically protected is combined with a specialized structure designed to oppose seismic actions by dissipating energy.
  • the specialized structures can be simply installed in external position, without having to carry out any works inside the building.
  • the specialized structure can consist in a tower or frame or column with suitably rigidity, connected to the building by means of rigid rods with two hinges normally disposed at each floor level.
  • the tower is tied at the base with a spherical joint or hinge. Therefore, the tower is free to oscillate in any direction around the spherical joint, rotating and pivoting on the joint (centre of rotation).
  • Dissipation devices or dampers are applied around the base of the tower, which strongly oppose the rotation and oscillation of the tower, thus suffering movements and dissipating energy by means of hysteresis cycles.
  • crank gears To amplify displacements (travel: elongation and shortening) of the dissipation devices, suitable mechanisms that operate by means of crank gears can be provided.
  • the global dissipation system which is concentrated at the base of the tower, can be of any type.
  • the main function of the tower is to oppose the effects produced by earth tremor by dissipating energy in the specialized area where dissipation devices of generic type (dampers) are installed.
  • the re-centering (balancing) of the tower is guaranteed by the elasticity of the building structure and also by elastic elements that can be connected in parallel to the energy dissipation means.
  • the tower that acts as seismic-resistant-dissipation element can be inserted inside the building (for example in the stairwell-elevator area).
  • the structural system of the invention has several advantages compared to the known systems.
  • the external seismic-resistant-dissipation structure is of spatial type (tower), it can provide additional usable volume (enlargement), no longer being an end in itself (of structural type only) and with lower incidence of the seismic adaptation cost.
  • Such a seismic-resistant-dissipation structure can be, for example, a vertical connection element (stairs, elevator) or emergency staircase. Reference is made to the frequent installation of steel emergency staircases outside public buildings, which can also represent a seismic protection element if designed with the structural system of the invention.
  • the installation of the specialized structure can be carried out without interrupting the ordinary use of the building to be protected.
  • Dissipation devices are concentrated in a single specialized area with limited dimensions (tower base), which is consequently easy to inspect and maintain.
  • the specialized dissipation area can be also positioned at higher levels, not only at the base of the tower.
  • the dissipation system guarantees high efficiency, taking full advantage of the devices, and high efficacy of the seismic-resistant devices that are concentrated in a single specialized area compared to the known methods with devices disseminated on the building, the operation of which is affected by the uncertain seismic reaction of the building as a whole, especially due to the presence of non-structural elements (walls in general, etc.).
  • the rigidity of external seismic-resistant structures with vertical development (tower, frame, column) connected by means of rigid rods to the building is such that it regularizes the deformation (horizontal floor displacements) of the building that is subject to earth tremor, which is generally irregular.
  • the structural system of the invention In case of hospital or school buildings, if the structural system of the invention has been correctly studied from an architectural viewpoint, it can provide improved design and improved operation with the use of additional structures (new spaces, services, etc.). This is made possible also because of the high formal flexibility of additional structures (for example, the tower can have a square, rectangular, polygonal, circular, etc. shape, can have a constant height or can be tapered vertically).
  • FIG. 2 a first embodiment of the structural system for seismic protection of buildings which is not part of the present invention is disclosed.
  • the building (E) to be protected comprises a plurality of levels defined by floors (S) disposed according to horizontal planes.
  • the structural system of the invention comprises at least one bearing structure (2) rigidly connected to the building (E).
  • the bearing structure (2) has basically the same height as the building (E) and is rigidly connected to the building by means of a plurality of rigid rods (3).
  • the rod (3) is provided with a first end (3a) tied to a wall of the building (E) and a second end (3b) tied to the bearing structure (2).
  • the bearing structure (2) is provided with a plurality of horizontal reinforcement elements (S') disposed at the same height as the floors (S) of the building (E).
  • the rigid rods (3) are disposed according to horizontal straight lines on the floors (S) of the building and the corresponding reinforcement elements (S') of the bearing structure.
  • the bearing structure (2) is a specialized structure that comprises an energy dissipation system adapted to dissipate the energy of the oscillations suffered by the bearing structure (2) due to earth tremor.
  • the specialized structure (2) is rigidly connected to the building (E). Therefore the energy dissipation system of the specialized structure is able to compensate and damp also the oscillations suffered by the building (E) during the shocks.
  • the specialized structure (2) is a tower disposed outside the building (E) and the horizontal reinforcement elements are floors (S') of the tower disposed between a first vertical wall (2a) facing the building (E) and a second vertical wall (2b) opposite the first vertical wall (2a). In this way a vertical row of parallelepiped spaces (V) is defined in the tower (2).
  • One dissipation device (1) is disposed in each space (V) of the tower (2), in bracing configuration, diagonally, in such a way to generate an energy dissipation system of the specialized structure (2) distributed along the entire height of the specialized structure.
  • the dissipation device comprises an energy dissipation means (1 c) disposed between two rigid rods.
  • the energy dissipation means (1 c) can be, for example, a chamber with fluid.
  • a shock-absorbing element, such as elastic means, spring means or damper can be disposed in parallel position to the energy dissipation means (1 c).
  • the dissipation device (1) comprises:
  • Figs. 3 - 5 describe an embodiment of the structural system of the invention, wherein the dissipation system is concentrated at the base of the tower (2).
  • the base of the tower (2) is tied to a spherical joint or hinge (4) mounted on a base (B) fixed to the ground.
  • the vertical axis of the tower (2) passes through the centre of the spherical joint (4).
  • a plurality of dissipation devices (1) is disposed in peripheral position around the spherical joint (4).
  • Each dissipation device (1) is provided with a first end (1 a) tied to the base (B) and a second end (1 b) tied at the base of the tower.
  • the tower (2) has a base (20) shaped as overturned pyramid, wherein the vertex of the pyramid is tied to the spherical joint (4).
  • two specialized structures (2) are sufficient, being disposed in the long opposite sides of the building, near the opposite angles of the building.
  • connection system of the tower (2) to the building (E) comprises four rigid rods (3) in each floor, disposed in W-configuration with three connection hinges (3a) on the building (E) and two connection hinges (3b) on the tower.
  • each tower (2) is damped by eight dissipation devices (1) disposed at the four angles of the tower base and along the central lines of the four sides of the tower base.
  • each dissipation device (1) is connected to a lever mechanism (5) to multiply the travel of the dissipation device (1), i.e. elongation/shortening of the dissipation device (1) to compensate the oscillation of the tower (2).
  • the lever mechanism (5) comprises two levers (L1, L2).
  • the first lever (L1) is pivoted in the central point (F1) to a projection (51) of a flange (50) tied to the base (B).
  • the second lever (L2) has a first end (La) pivoted at a projection of a flange (52) tied to the base (20) of the tower and a second end (Lb) pivoted at one end of the first lever (L1).
  • the dissipation device (1) has a first end (1 a) pivoted at a projection of the flange (52) tied to the base (20) of the tower and a second end (1 b) pivoted at the other end of the first lever (L1).
  • the dissipation device (1) is basically as long as the second lever (L2) and parallel to the second lever (L2) in such a way that first lever (L1), second lever (L2), flange (52) and dissipation device (1) form an articulated quadrilateral that can oscillate around the fulcrum (F1).
  • the travel ( ⁇ D ) of the dissipation device is related to the lever mechanism (5) and vertical displacement ( ⁇ v ) of the tower base.
  • the elongation or shortening of the dissipation device (1) will be twice as the vertical displacement ( ⁇ v ) of the base (20) of the tower.
  • a different version of the structural system of the invention is disclosed, wherein the specialized structure is a planar frame (102) composed, for example, of a reticular framework.
  • the dissipation devices (1) can be disposed at the base of the frame (102).
  • the frame (102) is tied to the ground by means of a planar hinge (104) instead of a spherical joint.
  • Figs. 3 , 5 , 6 , 7 , 8 and 9 show five-storey buildings and specialized structures (2; 102) provided with energy dissipation system concentrated only at the base of the structure.
  • each specialized structure can be made of multiple overlapped parts that are mutually tied by means of a central hinge around which the dissipation devices are disposed.
  • the connection between the various parts of the bearing structure is exactly made as the connection of the base of the bearing structure to the ground.
  • the specialized structure (202) can be the nucleus of the building, that is to say a tower inside the building that is rigidly connected to the internal walls of the building.
  • the tower (202) is provided with a specialized energy dissipation system, such as the systems described in the aforementioned embodiments.
  • FIG. 12 12A , 13 and 14 a different version of the structural system of the invention is described, wherein the specialized structure is a column (302).
  • the dissipation devices (1) can be disposed at the base of the column (302).
  • the column (302) is anchored to the ground by means of a spherical joint (4).
  • Fig. 12A shows an embodiment of the present invention in which the base of the column (302) is a horizontal plane under which the dissipation devices (1) and relevant multiplier lever mechanisms (5) are mounted.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
EP10747238.3A 2009-09-10 2010-08-31 Structural protection system for buildings Active EP2475829B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMC2009A000195A IT1395591B1 (it) 2009-09-10 2009-09-10 Sistema strutturale per protezione sismica di edifici.
PCT/EP2010/062748 WO2011029749A1 (en) 2009-09-10 2010-08-31 Structural protection system for buildings

Publications (2)

Publication Number Publication Date
EP2475829A1 EP2475829A1 (en) 2012-07-18
EP2475829B1 true EP2475829B1 (en) 2014-10-08

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Application Number Title Priority Date Filing Date
EP10747238.3A Active EP2475829B1 (en) 2009-09-10 2010-08-31 Structural protection system for buildings

Country Status (6)

Country Link
US (2) US20120167490A1 (zh)
EP (1) EP2475829B1 (zh)
JP (1) JP2013504700A (zh)
CN (1) CN102498253B (zh)
IT (1) IT1395591B1 (zh)
WO (1) WO2011029749A1 (zh)

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Also Published As

Publication number Publication date
EP2475829A1 (en) 2012-07-18
US20140059951A1 (en) 2014-03-06
WO2011029749A1 (en) 2011-03-17
CN102498253B (zh) 2014-05-28
ITMC20090195A1 (it) 2011-03-11
IT1395591B1 (it) 2012-10-16
CN102498253A (zh) 2012-06-13
US20120167490A1 (en) 2012-07-05
JP2013504700A (ja) 2013-02-07

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