JP2009280977A - Apparatus for applying three-dimensional loading to eccentric structure by change of response-displacement direction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for applying three-dimensional loading to an eccentric structure by a change of a response-displacement direction, which can perform a three-dimensional loading experiment allowing displacement in a perpendicular direction (depth direction) of loading. <P>SOLUTION: In this apparatus for applying the three-dimensional loading to the eccentric structure by the change of the response-displacement direction, the three-dimensional motion of a bridge pier 4 can be performed by linear contact of a loading position of the bridge pier 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seismic isolation foundation that takes train traveling into consideration, and more particularly to a loading device for an eccentric structure by changing a response displacement direction.

  In conventional seismic isolation foundations, the pile head and footing are joined with a flexible structure to reduce the effect of seismic motion on the structure, but this takes into account the direction of displacement. Not done. Therefore, if the seismic energy acts in the direction perpendicular to the line perpendicular to the train and the train track is displaced in the direction perpendicular to the line, the train may be derailed in the worst case due to the displacement.

  FIG. 3 is a schematic diagram of a loading test apparatus installed on a conventional group pile foundation corresponding to the above-described seismic isolation foundation, and FIG. 4 is a diagram showing a pier portion of the loading test apparatus installed on the group pile foundation. .

  In these drawings, 101 is a group pile, 102 is a rectangular footing on the group pile 101, 103 is a rectangular parallelepiped pier on the rectangular footing 102, 104 is a horizontal jack, 105 is a model ground surface in a soil tank, Reference numeral 106 denotes a soil tank side wall on the front side, 107 denotes a soil tank side wall on the rear side, 108 denotes a horizontal displacement meter, and 109 denotes loading by the horizontal jack 104.

  Here, the connection between the horizontal jack 104 and the rectangular parallelepiped pier 103 is a fixed point contact.

  As described above, the conventional loading test of the group pile foundation is performed by restraining the depth (loading perpendicular direction) displacement of the pier 103 by the soil tank side walls 106 and 107 in order to measure the load-displacement relationship in the loading direction. It was broken.

  In other words, since the loading direction coincides with the response direction of the conventional structure, only a two-dimensional experiment in the vertical plane is satisfied.

On the other hand, the inventors of the present application have reduced the vibration displacement in the direction perpendicular to the track, which has a large effect on train travel, and can achieve both good seismic isolation effect and train travel safety even during an earthquake. An apparatus was proposed (see Patent Document 1 below).
JP 2007-051438 A

  However, a three-dimensional loading experiment apparatus that allows displacement in the depth direction (the direction perpendicular to the loading direction) is required for the eccentric structure disclosed in the above-described Patent Document 1 by changing the response displacement direction.

  In view of the above situation, the present invention provides a three-dimensional loading device for an eccentric structure by changing a response displacement direction, which can perform a three-dimensional loading experiment that allows displacement in the depth direction (direction perpendicular to the loading direction). With the goal.

In order to achieve the above object, the present invention provides
[1] In a three-dimensional loading device for an eccentric structure by changing a response displacement direction, a three-dimensional movement of the pier is made possible by bringing the loading position of the pier into line contact.

  [2] In the three-dimensional loading device for an eccentric structure by changing the response displacement direction described in [1] above, a plate is arranged on the side surface of the pier, and horizontal and vertical sliders are installed on the plate, It is characterized by connecting horizontal jacks.

  [3] In the three-dimensional loading device for the eccentric structure by changing the response displacement direction described in [1] or [2] above, an inclinometer and a side opposite to the horizontal jack side of the pier are provided in the pier. A load direction horizontal displacement meter is provided on a side surface, a load perpendicular direction horizontal displacement meter is provided on an upper surface of the pier, and a vertical displacement meter is provided on an upper surface of the pier.

  According to the present invention, the following effects can be achieved.

  (1) It is possible to conduct loading experiments on eccentric structures by changing the response displacement direction, and contribute to the development of seismic isolation foundations that take into consideration train travelability during earthquakes.

  (2) It is possible to allow displacement of the pier in the depth direction.

  (3) Since the loading position is in line contact, it is possible to prevent the twisting phenomenon associated with the depth displacement.

  (4) By installing a horizontal slider and a vertical slider, the pier can be moved in three dimensions.

  The three-dimensional loading apparatus for the eccentric structure by changing the response displacement direction of the present invention enables the three-dimensional movement of the pier by making the loading position of the pier a line contact.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a schematic diagram of a three-dimensional loading apparatus for an eccentric structure by changing a response displacement direction according to an embodiment of the present invention, and FIG.

  In these figures, 1 is a group pile, 2 is a seismic isolation device on the group pile 1, 3 is a cubic footing, 4 is a cubic bridge pier on a cubic footing 3, 5 is on a cubic footing 3 And an inclinometer disposed in the cubic pier 4, 6 is a horizontal jack, 7 is a horizontal displacement meter in the loading direction disposed on the side surface of the cubic pier 4, and 8 is on the upper surface of the cubic pier 5. Horizontal displacement gauges placed at right angles to loading, 9 and 10 are vertical displacement meters arranged on the upper surface of the cubic pier 4, 11 is the model ground surface in the soil tank, 12 is the soil tank side wall on the near side, 13 is A rear side wall 14 of the tank indicates loading by the horizontal jack 6.

  FIG. 2 shows a drive mechanism for the horizontal jack 6. That is, the horizontal jack 6 is held by the plate 15, and the horizontal slider 16 and the vertical slider 17 are installed on the plate 15, so that loading by line contact is possible.

  Since the displacement direction change type seismic isolation foundation causes displacement in the direction perpendicular to the load (depth direction), such a three-dimensional loading device is used when performing a loading experiment. In order to allow displacement in the direction perpendicular to the loading (depth direction), the pier 5 is not restrained on the side walls 12 and 13 of the soil tank.

  In order to prevent the twisting phenomenon associated with the displacement in the perpendicular direction (depth direction) of the loading, the loading position is brought into line contact with the three-dimensional loading apparatus of the present invention.

  In the conventional loading test apparatus, the connection between the horizontal jack and the rectangular parallelepiped pier is a fixed point contact (see FIG. 4). However, in the loading apparatus of the present invention, the displacement of the pier 4 in the direction perpendicular to the loading (depth direction) is reduced. In order to allow it, a three-dimensional movement of the pier 4 was made possible by installing a horizontal slider 16 and a vertical slider 17.

  Since it comprised as mentioned above, a loading experiment can be performed with respect to the eccentric structure by change of a response displacement direction, and it can contribute to development of the seismic isolation foundation which considered the train runnability at the time of an earthquake.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The three-dimensional loading device for the eccentric structure by changing the response displacement direction of the present invention can perform a loading test on the structure having the displacement direction change type seismic isolation foundation, Available for development.

It is a schematic diagram of the three-dimensional loading apparatus with respect to the eccentric structure by the change of the response displacement direction which shows the Example of this invention. It is a block diagram of the principal part of the three-dimensional loading apparatus with respect to the eccentric structure by the change of the response displacement direction which shows the Example of this invention. It is a schematic diagram of the loading test apparatus installed in the conventional group pile foundation. It is a figure which shows the pier part of the loading test apparatus installed in the conventional group pile foundation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Group pile 2 Seismic isolation device 3 Cubic footing 4 Cubic pier 5 Inclinometer 6 Horizontal jack 7 Loading direction horizontal displacement meter 8 Loading perpendicular direction horizontal displacement meter 9,10 Vertical displacement meter 11 Model ground surface in the soil tank 12 Side soil tank side wall 13 Back side soil tank side wall 14 Loading by horizontal jack 15 Plate 16 Horizontal slider 17 Vertical slider

Claims (3)

  A three-dimensional loading device for an eccentric structure by changing a response displacement direction, wherein the loading position of the pier is brought into line contact to enable three-dimensional movement of the pier.   2. A three-dimensional loading apparatus for an eccentric structure by changing a response displacement direction according to claim 1, wherein a plate is arranged on a side surface of the pier, horizontal and vertical sliders are installed on the plate, and a horizontal jack is connected to the slider. A three-dimensional loading device for an eccentric structure by changing a response displacement direction.   3. A three-dimensional loading device for an eccentric structure by changing a response displacement direction according to claim 1 or 2, wherein an inclinometer in the pier and a horizontal displacement in the loading direction on a side opposite to the horizontal jack side of the pier. A three-dimensional loading device for an eccentric structure by changing a response displacement direction, comprising: a meter; a horizontal displacement meter perpendicular to a load on the upper surface of the pier; and a vertical displacement meter on the upper surface of the pier.