Driving velocity, natural frequency of vehicle and bridge are the main contributing factors to vibration a when passing bridge. By separating contributions first two factors, one can estimate indirectly from acceleration response it crosses In this paper, we apply concept fundamental using instrumented vehicle. The paper describes analytical formulation finite element simulation demonstrate feasibility method. Afterwards, an experimental verification as proof-of-concept method on full-scale...

This paper provides a review on the development of structural monitoring in Japan, with an emphasis type, strategy, and utilization systems. The focuses bridge building structures using vibration-based techniques. Structural systems Japan historically started objective evaluating responses against extreme events. In monitoring, collected data were used to verify design assumptions, update specifications, facilitate efficacy vibration control Strategies case studies for verification long-span...

This paper describes a study on modal analysis and tension estimation of stay cables by vision-based measurement under ambient condition. Microvibration cable is captured video camera, the amplitude amplified using phase-based motion magnification method. From sequences images, spatial displacements are extracted via discretized centroid searching Modal parameters cable, namely, natural frequency, damping ratio, mode shape, identified dynamic decomposition method from displacement responses....

This paper discusses the development of bridge monitoring in Japan. Firstly, background is described. The need for was originally influenced by geographical conditions. Due to fact that Japan prone natural disasters and has a severe environment deterioration; loading conditions with respect hazards been conducted several decades. In last decade, extended its function as an instrument efficient stock management. Based on accumulation concentrated construction former years, many bridges are...

Yokohama Bay Bridge, with a total span length of 860 m, is the second longest cable-stayed bridge in East Japan, and one most densely instrumented bridges Japan. On March 11, 2011, Great Japan (Tohoku) Earthquake hit northeastern magnitude MW 9.0, notably largest earthquake Japan's modern history. Intensity 5+(PGA 1.4–2.5 m/s2) maximum scale 7 Meteorogical Agency's seismic intensity was recorded on site. This paper describes response analyses bridge, system identification, performance...

Displacement is an essential indicator of the functioning and safety long-span cable-supported bridges under operational conditions. However, displacement estimation challenging as these are simultaneously subjected to various loading conditions such temperature, wind, vehicles. This article investigates approach for estimating bridge responses multiple loads using a residual autoencoder model. Monitoring data cable-stayed collected validate proposed approach, including comprehensive...

Abstract: A system that uses ambient vibration and two laser Doppler vibrometer (LDV) is developed for noncontact operational modal analysis of structural members. The employs natural excitation technique (NExT) to generate the cross‐correlation functions from signals, eigensystem realization algorithm (ERA) identify parameters To facilitate simultaneous identification, time‐synchronization construction response signals are proposed. Performance proposed verified experimentally by evaluating...

Analysis of strong motion recordings a base-isolated building during the March 11, 2011, Great East Japan (Tohoku) Earthquake is reported in this paper. The building, located Tokyo Bay area, an asymmetric L-shaped structure consisting seven-story and 14-story with vertical opening. Vibration monitoring system was installed on 2010, seismic responses were recorded including strongest shaking (peak ground acceleration 0.80–1.40 m/s2) experienced main shock Earthquake. survived earthquake...

New research and development program named “Infrastructure maintenance, renovation management” was started in 2014 under the Council of Science, Technology Innovation (CSTI)’s Strategic Program (SIP) Japan. The 5-year covers various subjects infrastructure maintenance with key technologies condition assessment using non-destructive testing, monitoring robotics, long-term performance prediction, durable high-quality material for repair replacement, management large amount bridges other data...

Strong motion data acquired from instrumented bridges during seismic events provides an excellent opportunity to gain insight into the behaviour of and performance their components. Using system identification, modal parameters can be estimated various level earthquake studied. In this study dynamic Yokohama-Bay Bridge is investigated using response recorded six earthquakes. Modal structure are realization state–space model. The method used here based on information matrix (SRIM), which...

This paper proposes a framework for estimating tensions of stay cables cable-stayed bridge with and without lateral attachments under limited information on cable properties. For attachments, tension is estimated using three known parameters, namely, length, mass per unit measured frequency while still accounting unknown features like bending stiffness, axial inclination, restraint boundary conditions at the ends. The methodology then extended to (dampers cross ties), whose properties are...

Abstract This paper presents the application of system identification (SI) to long‐span cable‐supported bridges using seismic records. The SI method is based on System Realization Information Matrix (SRIM) that utilizes correlations between base motions and bridge accelerations identify coefficient matrices a state‐space model. Numerical simulations benchmark cable‐stayed demonstrate advantages this in dealing with multiple‐input multiple‐output (MIMO) data from relatively short Important...