Building safety verification system and building safety verification method

• US 10,429,269 B2
• Filed: 01/08/2014
• Issued: 10/01/2019
• Est. Priority Date: 01/09/2013
• Status: Active Grant

• Current Assignee: NTT Facilities Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Facilities Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Yoshida, Kenichi, Nagashima, Shigeto, Motohi, Toshiya, Toyota, Kouzou, Sugimura, Yoshifumi, Gotou, Wataru, Mochiduki, Maki, Nishii, Hiroyasu
• Primary Examiner(s): Hossain, Moazzam
• Application Number:
  US14/759,316
• Publication Number:
  US 20150355050A1
• Time in Patent Office: 2,092 Days
• Field of Search: 702 56
• CPC Class Codes: G01B 5/14 for measuring distance or clearance between spaced objects or spaced apertures G01B5/24 takes precedence
• CPC Class Codes: G01M 5/0033 by determining damage, crack or wear
• CPC Class Codes: G01M 5/0066 by exciting or detecting vibration or acceleration vibration testing of structures G01M7/00
• CPC Class Codes: G01V 1/01 Measuring or predicting earthquakes
• CPC Class Codes: G01V 2210/1232 Earthquakes

Abstract

A building safety verification system and a building safety verification method for estimating a degree of damage of a building after an earthquake occurs are provided. The building safety verification system includes: an inter-story displacement measurement unit which obtains, from measurement data of acceleration sensors which measure accelerations of a plurality of stories in a building, an inter-story displacement of each of the stories; a natural period measurement unit which obtains a natural period of microtremor of the building from measurement data of a micro vibration sensor which measures micro vibration of a highest story of the building or a story near the highest story; and a building safety evaluation unit which evaluates soundness of the building from the inter-story displacement obtained by the inter-story displacement measurement unit and the natural period obtained by the natural period measurement unit.

Claims

1. A building safety verification system comprising:

a plurality of acceleration sensors which measure accelerations of a plurality of stories in a building;

an inter-story displacement measurement unit which receives the measured accelerations from the plurality of acceleration sensors and obtains an inter-story displacement of each of the stories by integrating each of the measured accelerations twice;

a natural period measurement unit which obtains a natural period of microtremor of the building from measurement data of a micro vibration sensor which measures micro vibration of a highest story of the building or a story near the highest story; and

a building safety evaluation unit which evaluates soundness of the building from the inter-story displacement obtained by the inter-story displacement measurement unit and the natural period obtained by the natural period measurement unit;

wherein the building safety evaluation unit evaluates the soundness of the building from a first determination result of determining whether the inter-story displacement exceeds a preset inter-story displacement threshold value; and

wherein the building safety evaluation unit determines a final determination result based on the first determination result, and wherein the final determination result includes one of (a) continuous use is possible, (b) continuous use is possible but it should be used with caution, and (c) rapid examination is necessary.

2. The building safety verification system according to claim 1, wherein, when the building safety evaluation unit determines that the inter-story displacement exceeds a preset inter-story displacement threshold value, the final determination result is that rapid examination is necessary.

3. The building safety verification system according to claim 1 or 2, wherein the building safety evaluation unit determines a countermeasure based on the final determination.

4. The building safety verification system according to claim 3, wherein the countermeasure includes a degree of urgency of evacuation.

5. A building safety verification method comprising:

an acceleration measurement step of measuring, by a plurality of acceleration sensors, accelerations of a plurality of stories in a building;

an inter-story displacement measurement step of receiving the measured accelerations from the plurality of acceleration sensors and obtaining, by an inter-story displacement measurement unit, an inter-story displacement of each of the stories by integrating each of the measured accelerations twice;

a natural period measurement step of obtaining, by a natural period measurement unit, a natural period of microtremor of the building from measurement data of a micro vibration sensor which measures micro vibration of a highest story of the building or a story near the highest story;

a building safety evaluation step of evaluating, by a building safety evaluation unit, soundness of the building from the inter-story displacement obtained by the inter-story displacement measurement unit and the natural period obtained by the natural period measurement unit;

wherein the building safety evaluation unit evaluates the soundness of the building from a first determination result of determining whether the inter-story displacement exceeds a preset inter-story displacement threshold value; and

wherein the building safety evaluation unit determines a final determination result based on the first determination result, and wherein the final determination result includes one of (a) continuous use is possible, (b) continuous use is possible but it should be used with caution, and (c) rapid examination is necessary.

6. A building safety verification system comprising:

a measurement unit which obtains deformation of a building configured by a plurality of stories in which a plurality of acceleration sensors are provided on a plurality of stories of the building, the acceleration sensors measure accelerations of the plurality of stories on a story-by-story basis, an acceleration sensor of a lowest story among the acceleration sensors is provided in a foundation portion or a lowest story portion of the building, and the acceleration sensor detects an acceleration of the foundation portion or the lowest story portion from data of the accelerations of the stories detected by the acceleration sensors during an earthquake and data of the acceleration of the foundation portion or the lowest story portion, and wherein the measurement unit receives the measured accelerations from the plurality of acceleration sensors and calculates an inter-story displacement of individual stories of the plurality of stories provided with the acceleration sensors from the data of the accelerations of the individual stories detected by the acceleration sensors during the earthquake by integrating each of the measured accelerations twice;

an evaluation unit which evaluates soundness of the building after the earthquake occurs using the deformation of the building obtained by the measurement unit; and

wherein the building safety evaluation unit evaluates the soundness of at least one individual story of the plurality of stories from a first determination result of determining whether the inter-story displacement of the at least one individual story exceeds a preset inter-story displacement threshold value; and

wherein the building safety evaluation unit determines a final determination result for the at least one individual story based on the first determination result, and wherein the final determination result includes one of (a) continuous use is possible, (b) continuous use is possible but it should be used with caution, and (c) rapid examination is necessary.

7. The building safety verification system according to claim 6, wherein, when the building safety evaluation unit determines that the inter-story displacement exceeds a preset inter-story displacement threshold value, the final determination result is that rapid examination is necessary.

8. The building safety verification system according to claim 6, wherein the measurement unit calculates an inter-story displacement of a story provided with any acceleration sensor other than the acceleration sensor of the lowest story from the data of the acceleration of the foundation portion or the lowest story portion detected by the acceleration sensor of the lowest story and data of an acceleration of the story detected by any acceleration sensor other than the acceleration sensor of the lowest story.

9. The building safety verification system according to claim 6, wherein the evaluation unit evaluates the soundness of the building after the earthquake occurs in consideration of a change in a tilt of the building due to the earthquake.

10. The building safety verification system according claim 6, comprising the acceleration sensors,

wherein the measurement unit is configured to be capable of acquiring data from the acceleration sensors.

11. The building safety verification system according claim 6, wherein the evaluation unit evaluates the soundness of the building through a determination using a combination of any of an inter-story displacement obtained by the measurement unit, a natural period of the building obtained through measurement, and a tilt angle of the building obtained through measurement.

12. The building safety verification system according to claim 11, comprising a natural period measurement unit which obtains the natural period of the building from a micro vibration sensor that measures a micro vibration of a highest story of the building or a story near the highest story.

13. The building safety verification system according to claim 12, wherein the natural period measurement unit obtains the natural period of the building after the earthquake occurs from the micro vibration sensor that measures the micro vibration of the highest story of the building or the story near the highest story.

14. The building safety verification system according to claim 12, wherein the natural period measurement unit obtains the natural period of a microtremor of the building from the micro vibration sensor that measures the micro vibration of the highest story of the building or the story near the highest story, and

one of the acceleration sensors is provided in the same story as a story in which the micro vibration sensor measures the micro vibration.

15. The building safety verification system according to claim 12, wherein the measurement unit calculates an inter-story displacement of a first story of the building based on a displacement amount of the first story and a displacement amount of the foundation portion of the building.

16. The building safety verification system according to claim 15, wherein the first story of the building is one of the highest story of the building, the story near the highest story, and a story close to the foundation portion.

17. The building safety verification system according to claim 12, wherein the evaluation unit evaluates the soundness of the building through a combination of a first determination result of determining whether the inter-story displacement exceeds a preset inter-story threshold value and a second determination result of determining whether the natural period exceeds a preset natural period threshold value.

18. The building safety verification system according to claim 12, further comprising a tilt angle measurement unit which is disposed in the highest story of the building or near the highest story and measures the tilt angle of the building,

wherein the evaluation unit evaluates the soundness of the building from the inter-story displacement, the natural period, and the tilt angle.

19. The building safety verification system according to claim 12, wherein the evaluation unit evaluates the soundness of the building through a combination of a first determination result of determining whether the inter-story displacement exceeds a preset inter-story threshold value, a second determination result of determining whether the natural period exceeds a preset natural period threshold value, and a third determination result of determining whether the tilt angle exceeds a preset tilt angle threshold value.

20. The building safety verification system according to claim 6, wherein the acceleration sensors detect accelerations of vibrations due to the earthquake.

21. A building safety verification method comprising the steps of:

obtaining, by a measurement unit, deformation of a building configured by a plurality of stories in which a plurality of acceleration sensors are provided on a plurality of stories of the building, the plurality of acceleration sensors measure accelerations of the plurality of stories on a story-by-story basis, an acceleration sensor of a lowest story among the plurality of acceleration sensors is provided in a foundation portion or a lowest story portion of the building, and the acceleration sensor detects an acceleration of the foundation portion or the lowest story portion, from data of the accelerations of the stories and data of the acceleration of the foundation portion or the lowest story portion detected by the plurality of acceleration sensors during an earthquake, and wherein the measurement unit receives the measured accelerations from the plurality of acceleration sensors and calculates an inter-story displacement of individual stories of the plurality of stories provided with the plurality of acceleration sensors from the data of the accelerations of the individual stories detected by the plurality of acceleration sensors during the earthquake by integrating each of the measured accelerations twice;

evaluating soundness of at least one individual story of the plurality of stories in the building after the earthquake occurs using a first determination result of determining whether the inter-story displacement of the at least one individual story exceeds a preset inter-story displacement threshold value; and

determining a final determination result for the at least one individual story based on the first determination result, and wherein the final determination result includes one of (a) continuous use is possible, (b) continuous use is possible but it should be used with caution, and (c) rapid examination is necessary.

22. A computer-readable recording medium recording a program for causing a computer of a building safety verification system for evaluating soundness of a building configured by a plurality of stories in which a plurality of acceleration sensors are provided on a plurality of stories of the building, the plurality of acceleration sensors measure accelerations of the plurality of stories on a story-by-story basis, and an acceleration sensor of a lowest story among the plurality of acceleration sensors is provided in a foundation portion or a lowest story portion of the building, to execute the steps of:

receiving, by a measurement unit, the measured accelerations from the plurality of acceleration sensors;

obtaining, by the measurement unit, an inter-story displacement of individual stories of the plurality of stories provided with the plurality of acceleration sensors from data of the accelerations of the individual stories detected by the plurality of acceleration sensors during an earthquake by integrating each of the measured accelerations twice;

evaluating the soundness of at least one individual story of the plurality of stories in the building after the earthquake occurs using a first determination result of determining whether the inter-story displacement of the at least one individual story exceeds a preset inter-story displacement threshold value; and

determining a final determination result for the at least one individual story based on the first determination result, and wherein the final determination result includes one of (a) continuous use is possible, (b) continuous use is possible but it should be used with caution, and (c) rapid examination is necessary.