Xin Wang

Xin Wang
Tokyo University of Science | TUS · Department of Architecture (Department of Sciences and Technology)

Doctor of Engineering

About

19
Publications
1,504
Reads
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66
Citations

Publications

Publications (19)
Article
Beam-end fractures of steel frame building structures cause the degradation of story stiffness, which may lead to the tilt or collapse of the whole structure. However, it is difficult to recognize this kind of local damage using conventional building damage detection methods. Generally, the beam-end fracture can be recognized directly from the puls...
Article
Full-text available
Hypertension is a global public issue, and sleep duration was regarded as its risk factors, however, the results were inconsistent. This study aims to deeply investigate and assess the association between sleep duration and hypertension. The electronic databases Cochrane Library, Pubmed and Embase updated to April, 30, 2020 were retrieved. Cohort s...
Article
In this study, a bridge seismic response monitoring system was developed based on smart phones and cloud server. Smart phones with built-in batteries, processor units, and a variety of MEMS, can offer promising hardware and software environments which can be used in Structural Health Monitoring System. Instead of building an independent network ser...
Conference Paper
In this study, changes of response characteristics, including natural frequency, mode shape, and shear-wave propagation, of a 1/3 scaled specimen of an 18-story steel structure corresponding to different damage patterns, plasticizing, yielding, breaking, buckling of beam and columns members, are examined. Though the natural frequencies decrease wit...
Article
Full-text available
In this study, a bridge seismic monitoring system was developed based on smartphones connected together in the same project as a sensor network using a cloud server for easy upload and access to data. Thus, a decentralized structural seismic monitoring network was established using easy-to-install smartphones as both sensing cells and intelligence...
Article
Displacement measurement is one of the most important methods for structural health monitoring. However, because of high cost and heavy on‐site installation, conducting displacement measurement using conventional sensors is not easy in practice. In this case, with improvements in image sensors in smart devices, it seems possible to measure displace...
Article
Vibration characteristics and relevance to damage on pile-heads of a tilted high-rise building with pile foundation and high aspect ratio are investigated with a translation-rotation model in this paper. The building has steel reinforced concrete (SRC) structure and a rectangular plane of a 1×5 span with 14 stories. The eaves height is 39.5m and th...
Article
Full-text available
After the 2011 Great East Japan Earthquake, long-term vibration measurement using high-density instruments is one of the most critical issues for structural-health-monitoring owing to increasing deterioration and threat of future large earthquakes. Because of the high initial and running costs of traditional monitoring systems, smart-device-based m...
Article
Full-text available
Vibration record before and after The 2011 Great East Japan Earthquake was obtained at the low-rise reinforced concrete building in Miyagi Prefecture near the Pacific. This study focused on analyzing dynamic characteristics of the building by using a series of ambient vibration data which was obtained before and after The 2011 Great East Japan Eart...
Article
Full-text available
Though the 2014 Ludian Earthquake had only a moderate magnitude (Ms 6.5), high-level ground motions of almost 1g occurred at Longtoushan Town (seismic station 53LLT), which located near the intersection of a conjugate-shaped seismogenic fault. The building damages on the pluvial fan and the river terrace at Longtoushan was clearly different. In ord...
Article
This paper describes the dynamic characteristics of existing buildings (one is a reinforced concrete structure, and the other is a steel) in Miyagi Pref., Japan. In this paper, the authors used the long-term ambient vibration data and earthquake responses data, which were recorded by a monitoring system with high-performance seismic sensors install...
Article
Because shaking modes of super high-rise buildings are very complicated, it is not enough to perform health-monitoring only for the whole structures. We try to extract story-by-story shear-wave velocities applying the deconvolution method to microtremor records measured at super high-rise buildings. The shear-wave propagation (including reflection,...
Poster
Full-text available
Aftermath of 1995 Hanshin Awaji earthquake marks the importance of ensuring a lot of valuable seismic response data for proper and rapid structural assessment. However, development and utilization of reliable vibration measurement system maintained at low cost is difficult.
Article
Fragility curves, the relationships between three kinds of building damage ratios, i.e., total collapse ratio (TCR), collapse ratio (CR) and damage ratio (DR), as well as ground motion characteristics, i.e., peak ground acceleration (PGA), peak ground velocity (PGV), Japan Meteorological Agency instrumental seismic intensity (IJMA) and spectral int...
Article
Relationships between collapse ratios (CRs) of buildings and characteristics of strong ground motions during the 2008 Wenchuan earthquake was founded. Vulnerability functions of buildings were established in relation to PGA, PGV, PSA, and PPSv. Damage criteria for CR<10% corresponding to “minor and moderate damage” were PGA<250 gal, PGV<25 cm/s, PS...

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Projects

Projects (2)
Project
Structural Vibration measurement of structures is one of the most essential issues in the field of Structural Health Monitoring as well as seismic disaster prevention. For this purpose, economical, yet effective measurement methods are desirable which can provide reliable information on the state of structures by measuring the structural vibration. Using smart devices is realized to be one of the possible methods to measure structural vibration or ground motions. Smart devices, with their onboard computational and communication capabilities, offer promising opportunities in the field of seismic and structural response measurement with extremely low initial and maintenance cost. This study proposes methods for seismic and structural vibration measurement using low-cost smart devices.
Project
to make clear the generation mechanism of near-fault pulse-like motions and its effect to buildings