Structural health monitoring (SHM) is widely used to monitor and assess the condition performance of engineering structures such as, buildings, bridges, dams, tunnels. Owing sensor defects, data acquisition errors, environmental interference, abnormal are often collected stored in systems. The this study essentially different from so-called "abnormal state data," which result structural physical damage or degradation. Abnormal totally related external interference rather than changes...

A novel copula-based probabilistic model is proposed to establish the temperature difference analysis for a long-span suspension bridge’s steel box girder. The key idea express two-dimensional function of in flat girder by using copulas. maximum and minimum values daily was developed long-terms structural health monitoring data. Then, correlation between adjacent differences investigated five types Akaike information criterion (AIC) used select an optimal from copulas, joint (two-dimensional...

This paper discusses the application of a connected pipe system (CPS) to suspension bridge in China for purpose vertical deflection monitoring and assessment. The CPS mainly consists three main parts: pressure transmitters detect height change liquid, pipes connect reference point measurement points, liquid fill pipes. Multiple transmitters, taken as point, were mounted inside girder. A transmitter was tower, fixed point. To verify performance reliability CPS, controlled load test after...

Deflection is an important issue in bridge structural health monitoring. An accurate deflection–vehicle load–temperature correlation model critical to abnormal data identification, deflection prediction under extreme conditions, and assessment. However, because of the discrete distribution time domain vehicle load complexity correlation, modeling method needs further studies. A novel developed this study. Based on concept influence line (DIL), raw monitoring are transformed into...

Monitoring strain data provides possibilities for the fatigue assessment of critical components in real structures under operational conditions. This paper presents a case study on investigation performance welded details. Long-term monitoring 4 years between 2006 and 2009 collected by structural health system mounted Runyang Suspension Bridge Cable-stayed are utilized. The focuses two aspects: (i) effects different raw damage (ii) necessity long-term measurement evaluation. results indicate...

Continuous and real-time tension force monitoring is a key point in fatigue damage evaluation for bridge suspenders or hangers. Usually, effective sensors are not equipped hangers of in-service bridges to obtain responses. Bridge-site-specified traffic loading information collected by Weigh-in-motion (WIM) system offers an opportunity address this issue. The daily can be estimated combination the data with finite element analysis. Support vector machine (SVM) adopted establish regression...

In structural health monitoring, temperature time-lag effect inevitably affects the state assessment and damage warning of structures. Most existing studies focused on using machine learning models to eliminate effect, but training is expensive. A novel time-domain translation (TDT) method proposed. Based linear correlation between deformation data, mean square error (MSE) original data fitting calculated. By translating sequences in time domain, MSE reduced effect. The Waitan Bridge located...

The worldwide application of streamlined flat steel box girder on long-span bridges calls for more knowledge its temperature distribution. rapid development structural health monitoring techniques offers a great opportunity to address this issue. A comprehensive approach installing equipment, collecting data, and applying long-term data study the distribution girders is developed. As demonstrated through analysis 1-year suspension bridge, first, mapping relation between effective ambient air...

Serviceability issues related to service load deformations is of great importance in-service bridge maintenance decision making. Development in structural health monitoring brings opportunities serviceability assessment for long-span bridges. In this study, a reliability framework traffic-induced vertical deflection developed by incorporating extreme values analysis and system with measurements. The includes the following steps: (a) identifying eliminating temperature component extracting...

Rib-to-deck joints in orthotropic steel decks (OSDs) are among the most fatigue-prone details of bridges. To improve fatigue performance existing bridges with OSDs, a strengthening method using externally bonded fiber-reinforced polymer (FRP) angles was proposed and experimentally studied. This study also presents field investigation strengthened OSDs FRP angles. First, on-site procedures glass (GFRP) were demonstrated on long-span suspension bridge. Two-day strain monitoring indicated that...

Despite the recent developments in structural health monitoring, there remain great challenges for accurately, conveniently, and economically assessing in-service performance of main cables long-span suspension bridges. A long-term monitoring technique is developed to measure tension force with a conventional sensing technology further provide assessment strategy cable. The system adopts vibrating strings transducers monitor forces separate cable strands anchor span. evaluation conducted...

Because of its high historical, cultural, and scientific value, wooden architectural heritage in East Asia requires comprehensive protection. The dou-gong (bracket set) is an essential member ancient Chinese architecture. hysteresis behaviors dou-gongs are critical to the abilities structures resist external dynamic loads, mainly including wind earthquakes. It crucial develop effective convenient method investigate performance quantitatively. This study developed a simplified finite element...

The operational performance of high-speed railway bridges is controlled by stiffness, and the reduction in bridge stiffness leads to a decline ride comfort. Therefore, it very important periodically evaluate bridges. To reasonably without operation interference, evaluation method proposed this paper based on regularly solving deflection limit most unfavorable monitoring data. First, analytical solution any that meets comfort requirements derived using real displacement train wheelset. Then,...