Investigation report for roughness changes after HOKKAIDO IBURI earthquake Japan, by using Smartphone roughness measurement by YAGI, Koichi BumpRecorder Co., Ltd. yagi@bumprecorder.com www.bumprecorder.com RPUG-PDRG 1st Joint Meeting
Past Earthquake in Japan Chuetu oki 2007 Chuetu 2004 Iburi 2018 & 2019 Kobe 1995 The great east Japan Kumamoto 2011 2016 RPUG-PDRG 1st Joint Meeting
IBURI earthquake 2018 Sep. 100km 100km RPUG-PDRG 1st Joint Meeting
Seismic intensity map Sapporo City Higashi Ward Sapporo Station New Chitose Airport Atsuma Mukawa Town Town RPUG-PDRG 1st Joint Meeting
IBURI earthquake 2019 Feb. RPUG-PDRG 1st Joint Meeting
Research distance up to 1,600km RPUG-PDRG 1st Joint Meeting
Measurement Method and Evaluation Index RPUG-PDRG 1st Joint Meeting
Smartphone type measurement Vibration data is collected under driving situations. RPUG-PDRG 1st Joint Meeting
IRI Class 2 calculation process Measure acceleration (a) Suspension estimation (b) Inverted QC simulation (c) Calculate profile (d) RPUG-PDRG 1st Joint Meeting
Using profile, compute indexes HEITANSEI sigma 平たん性 σ IRI - International Roughness Index JRI - Japanese Roughness Index Average of suspension expansion & Standard deviation of 3m compression under 80km/h driving profilometer measurement value. It situation. It includes longer wave indicate shorter wave length situation. length. (3) Calculate IRI 3m (2) QC simulation (1) Measured profile RPUG-PDRG 1st Joint Meeting
Using profile, compute indexes IRI / JRI - Roughness Representative value on the segment. BBI - Boeing Bump Index Pointed information of the bump size and location. 10m straight edge is used, and deepest depth is defined Bump Height. 10m Straight edge Bump Height RPUG-PDRG 1st Joint Meeting
Measurement Results around Atsuma Town and Mukawa Town RPUG-PDRG 1st Joint Meeting
Measurement result after earthquake Is this affect from quake? Only current data, judgment is difficult RPUG-PDRG 1st Joint Meeting
Result before and after 2018 This is not affect from quake. Comparison is effective to understand. After earthquake roughness situation draw by red line. Before earthquake draw by blue line. RPUG-PDRG 1st Joint Meeting
Result before and after 2019 RPUG-PDRG 1st Joint Meeting
JRI before earthquake RPUG-PDRG 1st Joint Meeting
JRI after earthquake RPUG-PDRG 1st Joint Meeting
BBI before earthquake RPUG-PDRG 1st Joint Meeting
BBI after earthquake RPUG-PDRG 1st Joint Meeting
Bump situation RPUG-PDRG 1st Joint Meeting
Bump situation RPUG-PDRG 1st Joint Meeting
Comparison IRI and JRI IRI JRI after IRI < JRI → shorter wave length damage before before < after → damage RPUG-PDRG 1st Joint Meeting
Measurement Results around Sapporo City Higashi Ward RPUG-PDRG 1st Joint Meeting
Measurement result after earthquake RPUG-PDRG 1st Joint Meeting
Result before and after 2018 RPUG-PDRG 1st Joint Meeting
Result before and after 2019 RPUG-PDRG 1st Joint Meeting
Comparison IRI and JRI IRI JRI after IRI < JRI → shorter wave length damage before RPUG-PDRG 1st Joint Meeting
Conclusion RPUG-PDRG 1st Joint Meeting
Conclusion - By using Smartphone, roughness condition can be measured quick, easy and wide area, low cost. - Roughness situation is changed after earthquake. - Comparison before and after is clearly indicate road damage. - IRI, JRI, BBI can indicate road damage, and sometime their characteristic is not same. Important is - not only after but also before, collecting data. - not only IRI but also JRI, BBI also using. RPUG-PDRG 1st Joint Meeting
Question(s)? YAGI, Koichi BumpRecorder Co., Ltd. yagi@bumprecorder.com http://www.bumprecorder.com RPUG-PDRG 1st Joint Meeting
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