Static and fatigue behavior of large stud shear connectors for steel–concrete composite bridges

Lee, Pil-Goo; Shim, Chang-Su; Chang, Sung‐Pil

doi:10.1016/j.jcsr.2005.01.007

Cited by 133 publications

(64 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 2010, the Lee, Shim, & Chang, 2005). To complete a weld, the ironworker loads a stud into a welding gun (weighing approximately five to eight pounds) and inserts the stud's non-flanged end into a cylindrical ceramic ferrule placed on the base material.…”

Section: Discussionmentioning

confidence: 99%

Spectral Analysis of Root-Mean-Square Processed Surface Electromyography Data as a Measure of Repetitive Muscular Exertion

Gant¹,

Fethke²,

Gerr³

2012

PsycEXTRA Dataset

View full text Add to dashboard Cite

Highly repetitive motion is associated with upper extremity musculoskeletal disorders (UEMSDs) among industrial workers, especially when encountered concurrently with forceful exertions. Current methods of estimating occupational exposure to "repetitiveness" provide information about the repetitiveness of joint motion, but fail to provide complete information about the repetitiveness of muscular exertion, a more biomechanically meaningful measure of repetition. This thesis introduces an innovative digital signal processing method, from which muscular exertion frequency was estimated. Specifically, time series recordings of muscle activity obtained with surface electromyography (sEMG) were processed with standard root-mean-square (RMS) amplitude calculations and then transformed from the time domain into the frequency domain. The mean power frequencies of the RMS-processed sEMG signals (MPF EMG ) were then calculated to estimate muscular exertion frequency.In a laboratory-based validation study involving repetitive isometric hand gripping exertions, MPF EMG was compared to established measures of muscular exertion frequency and joint motion frequency across a range of known exertion frequencies, exertion intensities (i.e. forces), and exertion durations (i.e., duty cycles). Strong linear relationships were observed between MPF EMG and external measures of muscular exertion frequency. However, performance of MPF EMG as a measure of muscular exertion frequency may be improved with an increase of the signal to noise ratio in the sEMG data. Signal processing parameters were therefore investigated and alternative techniques were explored. Alternative processing parameters were suggested to minimize difference between MPF EMG and established methods of muscular exertion frequency.A second laboratory-based validation study compared MPF EMG to an established measure of muscular exertion frequency and a widely-used measure of joint movement frequency during a simulated industrial task. Although a stronger linear relationship was observed between metrics of joint motion frequency and established measures of 2 muscular exertion, the differences between measures were not meaningful and the relationship between MPF EMG and established measures was moderate-to-strong.The final phase of this thesis explores the application of the newly proposed techniques to field-based data collected during a study of ironworkers involved in construction stud-welding tasks. Limitations in data collection limited the analysis of MPF EMG in this study.The research presented in this thesis introduces a novel metric based on the frequency analysis of RMS processed sEMG data, and presents evidence that MPF EMG has potential to be a valuable assessment technique of exposure to repetitive muscular exertion.Abstract Approved: _____________________________________ Thesis Supervisor

show abstract

Section: Discussionmentioning

confidence: 99%

Spectral Analysis of Root-Mean-Square Processed Surface Electromyography Data as a Measure of Repetitive Muscular Exertion

Gant¹,

Fethke²,

Gerr³

2012

PsycEXTRA Dataset

View full text Add to dashboard Cite

show abstract

“…A review of different types of connectors along with their main characteristics was presented by Shariati et al (2012). Among these one can cite the headed stud bolt (Lee et al 2005), the angle and channel connectors (Shariati et al, 2013, Maleki and Bagheri, 2008, 2008a, the various types of perfobond connectors (Vellasco et al 2007) and many recently proposed schemes (Shariati et al,2012). The most frequently employed shear connectors in buildings are the headed stud bolts.…”

Section: Partial Interactionmentioning

confidence: 99%

Parametric Modal Dynamic Analysis of Steel-Concrete Composite Beams with Deformable Shear Connection

Machado

Neves

Júnior

2017

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

Composite structural elements of steel-concrete began to be used only in 1960 after the development of methods and constructive dispositions that ensured the functionality of these two materials together. In order to verify the importance of the participation of the axial mode in the frequency spectrum of the free vibration problem in composite beams with deformable shear connection, several analyses for 4 different boundary conditions and stiffness connection variation were performed. The analysis of the problem was carried out by development and computational implementation of a finite element for composite beams with partial interaction in the longitudinal direction applied to the problem of free vibrations. The solutions to this problem in the literature are scarce, and project recommendations are simplified. The results show that the finite element exhibits an excellent performance compared with the analytical results and as the axial mode has a high modal contribution, despite the boundary condition and stiffness connection.

show abstract

“…Judging from these results, it is necessary to prevent slab failure by considering the reinforcement details. In order to use the empirical equation considering the shank failure of studs, which is the case of large stud shear connection [9,10], the splitting strength of the concrete slab should be higher than the ultimate strength of the stud connectors.…”

Section: Static Strength Of Lying Stud Shear Connectionmentioning

confidence: 99%

Experimental investigation of double composite twin-girder railway bridges

Kim

Shim

2009

Journal of Constructional Steel Research

Self Cite

View full text Add to dashboard Cite

Static and fatigue behavior of large stud shear connectors for steel–concrete composite bridges

Cited by 133 publications

References 5 publications

Spectral Analysis of Root-Mean-Square Processed Surface Electromyography Data as a Measure of Repetitive Muscular Exertion

Spectral Analysis of Root-Mean-Square Processed Surface Electromyography Data as a Measure of Repetitive Muscular Exertion

Parametric Modal Dynamic Analysis of Steel-Concrete Composite Beams with Deformable Shear Connection

Experimental investigation of double composite twin-girder railway bridges

Contact Info

Product

Resources

About