In this paper, a fiber Bragg grating (FBG)-based stress monitoring system instrumented on an orthotropic steel deck arch bridge is demonstrated. The FBG sensors are installed at two types of critical fatigue-prone welded joints to measure the strain and temperature signals. A total 64 deployed around rib-to-deck rib-to-diagram areas mid-span quarter-span investigated bridge. local behaviors caused by highway loading effect during construction operation periods presented with aid wavelet...

A numerical approach of wear prediction integrating with system kinematics is proposed to investigate the interaction between joint clearance and in multi-body systems. The coupling modelled by process finite-element-based iterative scheme. Kinematical behaviours a machine kinematical model imperfect are progressively changed throughout process. massless link for assumption continuous contacts used. Results from predictions tests show that both zones depth different pin bushing.

The accuracy of fatigue life assessment for the welded joint in a steel bridge is largely dependent on an appropriate [Formula: see text]-[Formula: text] curve. In this paper, master curve-based approach with open-rib orthotropic deck proposed based finite element model (FEM) and field monitoring data from structural health (SHM) system. case studies by use analysis (FEA) constant-amplitude cyclic loading mode under variable-amplitude are addressed. FEA, distribution stress at fatigue-prone...

The present study investigates the possibility of direct removal oxygen from Ti-30Ni (wt per cent) alloy melt through thermodynamic equilibrium reactions at 1623 K in vertical tube furnace. deoxidation efficiency Ti-Ni by adding different contents metallic calcium (Ca) as a deoxidant was evaluated with binary CaF2-MgCl2 flux. experiments showed that total content decreased about 650 ppm to 350 when 3.5 wt cent Ca added alloy. Alternatively, effect flux composition on also investigated K....

The modal identification is significant for the condition assessment of transmission towers. However, effect excitation patterns on has not been adequately investigated full-scale In this study, comprehensive field tests are conducted a tower. An automated Bayesian approach proposed to identify most probable values (MPVs) parameters with posterior coefficient variations (COVs). It found that identified MPVs by different consistent, whereas COVs show differences. uncertainty forced vibration...

Up to date, few studies on the dynamic characteristics analysis and model updating of large-size ultrahigh-voltage (UHV) transmission towers with long cross arms have been conducted due lack onsite measurement data. In this paper, a framework for vibration test–based UHV is proposed using fast Bayesian Fourier transform (FFT) method an interactive optimization approach. The response T-shaped ±800-kV tower achieved by performing ambient test. characteristic parameters (frequencies, damping...

This paper aims to conduct the reliability-based assessment of welded joint in orthotropic steel bridge deck by use a mesh-insensitive structural stress (MISS) method, which is an effective numerical procedure determine reliable distribution adjacent weld toe. Both solid element model and shell are first established investigate sensitivity size type calculating under different loading scenarios. In order achieve realistic condition joint, probabilistic approach based on reliability theory...

The structural strain plays a significant role in condition assessment of in-service bridges terms bearing capacity, reliability level and entire safety redundancy. Therefore, it has been one the most important parameters concerned by researchers engineers engaged health monitoring (SHM) practices. In this paper, an SHM system instrumented on Jiubao Bridge located Hangzhou, China is firstly introduced. This involves nine subsystems continuously operated for five years since 2012. As part...

Current index factors considered in tunnel blasting quality evaluation are relatively onefold, as well the unrefined standards, which may debase reliability of evaluations. In this study, an system tunnel-controlled was first established considering characteristics geometry and safety. The fractal dimensions contours were calculated based on field over/underbreak data using wavelet analysis. Then, grades weights obtained via cluster analyses innovative combination weighting method,...

This study introduces a data‐driven approach for updating the fatigue failure probability of orthotropic steel deck (OSD) using Bayesian backward propagation. The OSD in bridges is considered as parallel system composed two critical fatigue‐prone components, namely, rib‐to‐diaphragm and rib‐to‐deck joints. A probabilistic model reliability established based on equivalent structural stress method limit state function. system‐level then constructed, taking into account correlations between...

The accuracy and integrity of stress data acquired by bridge heath monitoring system is significant importance for safety assessment. However, the missing abnormal are inevitably existed in a realistic system. This paper presents reconstruction approach based on wavelet multi-resolution analysis support vector machine (SVM). proposed method has been applied imputation recorded structural health (SHM) instrumented prestressed concrete cable-stayed bridge. effectiveness wavelet-based SVM...

To investigate the digit force control during a five-digit precision grasp in aligned (AG) and unaligned grasping (UG) configurations.The effects of various cylindrical handles for tools on power performance have been previously investigated. However, there is little information strategy to fit configurations.Twenty healthy young adults were recruited perform lift-hold-lower task. The AG UG configurations simulator with transducers adjusted each individual. applied moment, variability...

Steel arch bridges with inclined ribs under strong wind fields are prone to fatigue damage due the stress concentration at position of hanger connections. Therefore, it is essential perform wind-induced response analysis for specified shape hangers, such as determine distribution and corresponding influencing factors. In this study, a fatigue-prone asymmetric steel bridge performed by numerical simulation approach. The investigated hangers’ models established using COMSOL Multiphysics...