Deflection data provides important information about the mechanical characteristics and structural health condition of bridges. The study presented here pertains to development a deep learning based approach for monitoring by employing bridge deflections. method herein uses long short-term memory (LSTM) framework in detecting state damage tracking feature changes time-series deflection temperature data. Chongqing Egongyan Rail Transit Suspension Bridge was employed over period 15 months...

A bridge monitoring approach is proposed for the distributed detection and quantification of crack opening displacements (CODs) along lengths large bridges. The method does not require a priori knowledge traffic loads applicable under normal operational conditions damage index introduced, using difference between crack-induced strain peak values base strains caused by moving loads. applicability detected cracks demonstrated in terms CODs at number locations multispan bridge. Six field tests...

We report on the effect of femtosecond-laser-induced periodic surface structures (LIPSS) tribological properties stainless steel. Uniform nanostructures were produced AISI 304L (American Iron and Steel Institute steel grade) surfaces using an 800-nm femtosecond laser. The spatial periods LIPSS measured by field emission scanning electron microscopy ranged from 530 to 570 nm. smooth textured with investigated reciprocating ball-on-flat tests against 440C balls under both dry starved oil...

Stress-strain response of optical fibers in direct tension is introduced this article. The research involved tests and development theoretical relationships describing the tensile behavior fibers. Two types fibers, namely ribbon standard single mode fiber (SMF-28) were included experimental investigations. impetus for study was need elastic properties such as modulus elasticity limit accurate interpretation strains measured by sensors. Ribbon have proven to be robust sensing applications...

Bowl-like titanium oxide nanoparticles were successfully prepared by a simple solvothermal method using absolute ethanol and isopropanol as the cosolvent. Ostwald ripening coupled with inner-stress-induce effect assumed to play an important role in formation of this unique bowl-like morphology. The morphological evolution from solid nanosphere nanoparticle was investigated scanning electron microscopy (SEM) transmission (TEM). Besides, structural characteristics as-synthesized TiO2 confirmed...

A novel core-shell-type electrorheological (ER) composite material was fabricated via using polyaniline as an insulating layer to the outer surface of core conductive metal-organic framework (MIL-125) with controlled size and morphology. MIL-125 firstly synthesized by a solvothermal method, then in polar solvent tight coating successfully achieved form MIL-125@PANI core-shell nanocomposite. This structure greatly enhances polarization ability dispersed particles, thereby improving their...

A simple method for synthesis of porous TiO2 nanoparticles was developed via a two-step route using titanium metal–organic framework (MOF) as precursor, in which MOFs were first prepared by cetyltrimethylammonium bromide (CTAB) assisted solvothermal and then calcined air at 500 °C. After pyrolysis precursor MOFs, the anatase inherited porosity MOF possessed large surface area uniform pore distribution, subsequently adopted an electrorheological (ER) material dispersing silicone oil. ER...

The electric power system is one of the cornerstones modern society. One its most serious malfunctions blackout, a catastrophic event that may disrupt substantial portion system, playing havoc to human life and causing great economic losses. Thus, understanding mechanisms leading blackouts creating reliable resilient grid has been major issue, attracting attention scientists, engineers, stakeholders. In this paper, we study blackout problem in grids by considering practical phase-oscillator...

The development of a generalized machine learning approach based on distributed detection and quantification cracks by optical fibers is described in this article. A Brillouin scattering fiber sensor system was employed to develop, test, verify the method. main components herein consist an unsupervised crack identification module iForest algorithm component one-dimensional convolutional neural network attribute model versatility for application various types structures. proposed method does...

Tetragonal-facet-rod anatase TiO₂ with (100) facets was synthesized <italic>via</italic> a solvothermal method, which exhibits smart electrorheological behavior under an external electric field.

A new type of composite structure, the box girder with corrugated steel webs (CSWs) and trusses, is proposed recently. In order to investigate structural behavior under positive negative bending moments, flexural tests continuous were carried out, failure modes, deformation patterns, strain distribution, development concrete cracks investigated. Finite element analysis was conducted effect range in tube thickness CSWs on behavior. The experimental numerical results show that test beam has a...

ABSTRACT Hierarchical polyaniline/polypyrrole (PANI/PPy) copolymer nanofiber was prepared via a two‐step method and adopted as dispersing materials for electrorheological (ER) fluids. The first step used to synthesize PANI nanofibers by rapid mixing method. Subsequently, the PANI/PPy with rough surface were obtained using an in situ polymerization continuously. morphology of resultant can be controlled varying amount Py monomer secondary confirmed scanning electron microscopy transmission...

Deflection monitoring plays a key role in bridge Structural Health Monitoring, as deflection data may offer valuable insights into potential structural issues, such cracks and corrosion. However, deflections under operative loads presents challenges, particularly scenarios where establishing fixed reference point for displacement sensors is impractical, when spans waterway or the be vulnerable to vandalism. In recent years, inverse Finite Element Method (iFEM) has emerged possible solution....

To investigate the reasonable range of inclination angle arch ribs, a spatial finite element method was employed based on concrete-filled steel tube (CFST) basket-handle through an bridge with span 360 m. A model established using Midas/Civil software, which verified actual data. The effects different rib angles were investigated under static loads. structural natural frequencies, linear elastic stability coefficients, internal forces, and displacements comprehensively considered to...