Actual Measurement Damping Database of Full-Scale Buildings and Architecture
In December 2020, the Architectural Institute of Japan (AIJ) published a book titled “Damping and Vibration of Buildings.” In addition, the Sub Committee of Estimation of Damping Mechanism and its Performance on Buildings by AIJ released a database (DB) on the measured damping ratios collected from various types of buildings, so that they can be widely used in the structural design and research activities.
[Notes]
1) When using a DB, the user is responsible for selecting and interpreting the data. The AIJ shall not be responsible for any damage or other disadvantages arising from the use of the DB.
2) When using this DB to publish papers and other publications, please ensure to mention the name of the DB used.
1. Overview of DB
From the viewpoint of accurately evaluating the damping of buildings, the Sub Committee of Estimation of Damping Mechanism and its Performance on Buildings collected and arranged the measured damping data of various types of buildings.
The data in the DB can be summarized as follows:
(1) General buildings: 382 (183 steel buildings, 104 RC buildings, and 95 SRC and CFT buildings, including 59 buildings that obtained the records described in (6) during the 2011 earthquake off the Pacific coast of Tohoku)
(2) Vibration-controlled buildings: 71 (57 general vibration-controlled buildings, 12 tower-like vibration-controlled buildings, and two wooden vibration-controlled buildings)
(3) 247 small-scale buildings (220 wooden structures and 27 low-rise steel structures)
(4) 55 shell and spatial structures
(5) 153 tower-like structures (24 towers, 87 steel lattice towers, and 42 chimneys)
(6) Observation record data of 59 general buildings during the 2011 earthquake (13 steel buildings and 46 RC and SRC buildings)
2. Items in the DB
The items contained in DB are as follows. The order of items and contents are slightly different depending on the building type. Note that the following contents may change under future data updates.
《Items related to the specifications of buildings and structures》
1）Building number
2）Structure type
*It is listed in terms of the information of the structural type in the building item (1)
3）Location (prefecture)
4）Year of completion
5）Number of floors (aboveground/basement/penthouse) [Excluding shell and spatial structures, as well as steel towers and chimneys among the tower-like structures]
6）Building (or structure) height [Excluding shell and spatial structures]
7）Length of the long and short sides in a building plan [Excluding shell and spatial structures]
Lengths are typically shown in the form of long side × short side, and a plain shape is listed if it is not a rectangle or circle. (In some small-scall buildings, areas are listed instead of lengths.)
8）Building use [Excluding shell and spatial structures]
In the case of multiple uses, the main usage is listed.
9）Type of vibration-control device [Only for vibration-controlled buildings]
10）Exterior material [Only for shell and spatial structures]
11）Type of shell and spatial structure [Only for shell and spatial structures]
12）Span and rise [Only for shell and spatial structures]
13）Foundation type and depth [Excluding towers of "standing-on-the-roof" type]
Foundation types are roughly classified into the direct and pile foundations. In addition, the rooting and pile-tip depths (applicable only for buildings with pile foundation) are listed. The pile length is determined from the "pile tip depth - rooting depth."
14）Design vibration characteristics values [Excluding small-scale buildings and shell and spatial structures]
The first-mode natural period and damping ratio are listed below.
《Items related to actual measurement information》
15）Actual measurement number
Each measurement method is numbered. If the year and time of a measurement differ, the numbers are listed in order from 1. In addition, when multiple damping evaluation methods are used in the same actual measurement, or for data according to the amplitude level, the data is classified by numbering with lowercase letters, such as 1a, 1b, ... In this case, black spaces are left until (19).
16）Actual measurement method
17）Actual measurement year or time
If multiple measurements have been performed in the same year (mainly earthquake observations), the actual measurement year and month are listed in parentheses. In addition, the measurement within half a year after completion is listed as "at completion."
18）Condition of the vibration-control device [Only for vibration-controlled buildings]
19）Natural period (1st to 3rd or 6th modes)
Natural period values in the short- and long-side direction modes and torsional mode are listed. Small-scale buildings contain only first-mode data, whereas shell and spatial structures contain higher-mode data. The same applies to the damping ratio in (21).
20）Damping evaluation method
21）Damping ratio (1st to 3rd )
22）Amplitude
The amplitude value represents the root-mean-square (RMS) or the maximum value, and the first-mode values in the short- and long-side modes and torsional mode are listed. For the torsional mode, the value of the rotation angle at the edge of the building is also shown.
Files for DB Download
0. Batch download of all DBs (Zip file)
1. Download of DB of general buildings (Excel file)
2. Download of DB of vibration-controlled buildings (Excel file)
3. Download of DB of small-scale buildings (Excel file)
4. Download of DB of shell and spatial structures (Excel file)
5. Download of DB of tower-like structures (Excel file)
Contact us:
miyazu@rs.tus.ac.jp